diff --git a/src/main/java/io/reactivex/rxjava3/core/Completable.java b/src/main/java/io/reactivex/rxjava3/core/Completable.java
index 06183c66db..f25320d66b 100644
--- a/src/main/java/io/reactivex/rxjava3/core/Completable.java
+++ b/src/main/java/io/reactivex/rxjava3/core/Completable.java
@@ -12,6 +12,7 @@
  */
 package io.reactivex.rxjava3.core;
 
+import java.util.Objects;
 import java.util.concurrent.*;
 
 import org.reactivestreams.Publisher;
@@ -120,7 +121,7 @@ public abstract class Completable implements CompletableSource {
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public static Completable ambArray(final CompletableSource... sources) {
-        ObjectHelper.requireNonNull(sources, "sources is null");
+        Objects.requireNonNull(sources, "sources is null");
         if (sources.length == 0) {
             return complete();
         }
@@ -149,7 +150,7 @@ public static Completable ambArray(final CompletableSource... sources) {
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public static Completable amb(final Iterable<? extends CompletableSource> sources) {
-        ObjectHelper.requireNonNull(sources, "sources is null");
+        Objects.requireNonNull(sources, "sources is null");
 
         return RxJavaPlugins.onAssembly(new CompletableAmb(null, sources));
     }
@@ -187,7 +188,7 @@ public static Completable complete() {
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public static Completable concatArray(CompletableSource... sources) {
-        ObjectHelper.requireNonNull(sources, "sources is null");
+        Objects.requireNonNull(sources, "sources is null");
         if (sources.length == 0) {
             return complete();
         } else
@@ -213,7 +214,7 @@ public static Completable concatArray(CompletableSource... sources) {
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public static Completable concat(Iterable<? extends CompletableSource> sources) {
-        ObjectHelper.requireNonNull(sources, "sources is null");
+        Objects.requireNonNull(sources, "sources is null");
 
         return RxJavaPlugins.onAssembly(new CompletableConcatIterable(sources));
     }
@@ -261,7 +262,7 @@ public static Completable concat(Publisher<? extends CompletableSource> sources)
     @SchedulerSupport(SchedulerSupport.NONE)
     @BackpressureSupport(BackpressureKind.FULL)
     public static Completable concat(Publisher<? extends CompletableSource> sources, int prefetch) {
-        ObjectHelper.requireNonNull(sources, "sources is null");
+        Objects.requireNonNull(sources, "sources is null");
         ObjectHelper.verifyPositive(prefetch, "prefetch");
         return RxJavaPlugins.onAssembly(new CompletableConcat(sources, prefetch));
     }
@@ -311,7 +312,7 @@ public static Completable concat(Publisher<? extends CompletableSource> sources,
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public static Completable create(CompletableOnSubscribe source) {
-        ObjectHelper.requireNonNull(source, "source is null");
+        Objects.requireNonNull(source, "source is null");
         return RxJavaPlugins.onAssembly(new CompletableCreate(source));
     }
 
@@ -334,7 +335,7 @@ public static Completable create(CompletableOnSubscribe source) {
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public static Completable unsafeCreate(CompletableSource source) {
-        ObjectHelper.requireNonNull(source, "source is null");
+        Objects.requireNonNull(source, "source is null");
         if (source instanceof Completable) {
             throw new IllegalArgumentException("Use of unsafeCreate(Completable)!");
         }
@@ -356,7 +357,7 @@ public static Completable unsafeCreate(CompletableSource source) {
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public static Completable defer(final Supplier<? extends CompletableSource> completableSupplier) {
-        ObjectHelper.requireNonNull(completableSupplier, "completableSupplier");
+        Objects.requireNonNull(completableSupplier, "completableSupplier");
         return RxJavaPlugins.onAssembly(new CompletableDefer(completableSupplier));
     }
 
@@ -380,7 +381,7 @@ public static Completable defer(final Supplier<? extends CompletableSource> comp
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public static Completable error(final Supplier<? extends Throwable> errorSupplier) {
-        ObjectHelper.requireNonNull(errorSupplier, "errorSupplier is null");
+        Objects.requireNonNull(errorSupplier, "errorSupplier is null");
         return RxJavaPlugins.onAssembly(new CompletableErrorSupplier(errorSupplier));
     }
 
@@ -400,7 +401,7 @@ public static Completable error(final Supplier<? extends Throwable> errorSupplie
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public static Completable error(final Throwable error) {
-        ObjectHelper.requireNonNull(error, "error is null");
+        Objects.requireNonNull(error, "error is null");
         return RxJavaPlugins.onAssembly(new CompletableError(error));
     }
 
@@ -428,7 +429,7 @@ public static Completable error(final Throwable error) {
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public static Completable fromAction(final Action run) {
-        ObjectHelper.requireNonNull(run, "run is null");
+        Objects.requireNonNull(run, "run is null");
         return RxJavaPlugins.onAssembly(new CompletableFromAction(run));
     }
 
@@ -457,7 +458,7 @@ public static Completable fromAction(final Action run) {
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public static Completable fromCallable(final Callable<?> callable) {
-        ObjectHelper.requireNonNull(callable, "callable is null");
+        Objects.requireNonNull(callable, "callable is null");
         return RxJavaPlugins.onAssembly(new CompletableFromCallable(callable));
     }
 
@@ -478,7 +479,7 @@ public static Completable fromCallable(final Callable<?> callable) {
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public static Completable fromFuture(final Future<?> future) {
-        ObjectHelper.requireNonNull(future, "future is null");
+        Objects.requireNonNull(future, "future is null");
         return fromAction(Functions.futureAction(future));
     }
 
@@ -503,7 +504,7 @@ public static Completable fromFuture(final Future<?> future) {
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public static <T> Completable fromMaybe(final MaybeSource<T> maybe) {
-        ObjectHelper.requireNonNull(maybe, "maybe is null");
+        Objects.requireNonNull(maybe, "maybe is null");
         return RxJavaPlugins.onAssembly(new MaybeIgnoreElementCompletable<T>(maybe));
     }
 
@@ -531,7 +532,7 @@ public static <T> Completable fromMaybe(final MaybeSource<T> maybe) {
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public static Completable fromRunnable(final Runnable run) {
-        ObjectHelper.requireNonNull(run, "run is null");
+        Objects.requireNonNull(run, "run is null");
         return RxJavaPlugins.onAssembly(new CompletableFromRunnable(run));
     }
 
@@ -553,7 +554,7 @@ public static Completable fromRunnable(final Runnable run) {
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public static <T> Completable fromObservable(final ObservableSource<T> observable) {
-        ObjectHelper.requireNonNull(observable, "observable is null");
+        Objects.requireNonNull(observable, "observable is null");
         return RxJavaPlugins.onAssembly(new CompletableFromObservable<T>(observable));
     }
 
@@ -591,7 +592,7 @@ public static <T> Completable fromObservable(final ObservableSource<T> observabl
     @BackpressureSupport(BackpressureKind.UNBOUNDED_IN)
     @SchedulerSupport(SchedulerSupport.NONE)
     public static <T> Completable fromPublisher(final Publisher<T> publisher) {
-        ObjectHelper.requireNonNull(publisher, "publisher is null");
+        Objects.requireNonNull(publisher, "publisher is null");
         return RxJavaPlugins.onAssembly(new CompletableFromPublisher<T>(publisher));
     }
 
@@ -613,7 +614,7 @@ public static <T> Completable fromPublisher(final Publisher<T> publisher) {
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public static <T> Completable fromSingle(final SingleSource<T> single) {
-        ObjectHelper.requireNonNull(single, "single is null");
+        Objects.requireNonNull(single, "single is null");
         return RxJavaPlugins.onAssembly(new CompletableFromSingle<T>(single));
     }
 
@@ -643,7 +644,7 @@ public static <T> Completable fromSingle(final SingleSource<T> single) {
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public static Completable fromSupplier(final Supplier<?> supplier) {
-        ObjectHelper.requireNonNull(supplier, "supplier is null");
+        Objects.requireNonNull(supplier, "supplier is null");
         return RxJavaPlugins.onAssembly(new CompletableFromSupplier(supplier));
     }
 
@@ -678,7 +679,7 @@ public static Completable fromSupplier(final Supplier<?> supplier) {
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public static Completable mergeArray(CompletableSource... sources) {
-        ObjectHelper.requireNonNull(sources, "sources is null");
+        Objects.requireNonNull(sources, "sources is null");
         if (sources.length == 0) {
             return complete();
         } else
@@ -719,7 +720,7 @@ public static Completable mergeArray(CompletableSource... sources) {
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public static Completable merge(Iterable<? extends CompletableSource> sources) {
-        ObjectHelper.requireNonNull(sources, "sources is null");
+        Objects.requireNonNull(sources, "sources is null");
         return RxJavaPlugins.onAssembly(new CompletableMergeIterable(sources));
     }
 
@@ -822,7 +823,7 @@ public static Completable merge(Publisher<? extends CompletableSource> sources,
     @SchedulerSupport(SchedulerSupport.NONE)
     @BackpressureSupport(BackpressureKind.FULL)
     private static Completable merge0(Publisher<? extends CompletableSource> sources, int maxConcurrency, boolean delayErrors) {
-        ObjectHelper.requireNonNull(sources, "sources is null");
+        Objects.requireNonNull(sources, "sources is null");
         ObjectHelper.verifyPositive(maxConcurrency, "maxConcurrency");
         return RxJavaPlugins.onAssembly(new CompletableMerge(sources, maxConcurrency, delayErrors));
     }
@@ -845,7 +846,7 @@ private static Completable merge0(Publisher<? extends CompletableSource> sources
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public static Completable mergeArrayDelayError(CompletableSource... sources) {
-        ObjectHelper.requireNonNull(sources, "sources is null");
+        Objects.requireNonNull(sources, "sources is null");
         return RxJavaPlugins.onAssembly(new CompletableMergeDelayErrorArray(sources));
     }
 
@@ -867,7 +868,7 @@ public static Completable mergeArrayDelayError(CompletableSource... sources) {
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public static Completable mergeDelayError(Iterable<? extends CompletableSource> sources) {
-        ObjectHelper.requireNonNull(sources, "sources is null");
+        Objects.requireNonNull(sources, "sources is null");
         return RxJavaPlugins.onAssembly(new CompletableMergeDelayErrorIterable(sources));
     }
 
@@ -973,8 +974,8 @@ public static Completable timer(long delay, TimeUnit unit) {
     @NonNull
     @SchedulerSupport(SchedulerSupport.CUSTOM)
     public static Completable timer(final long delay, final TimeUnit unit, final Scheduler scheduler) {
-        ObjectHelper.requireNonNull(unit, "unit is null");
-        ObjectHelper.requireNonNull(scheduler, "scheduler is null");
+        Objects.requireNonNull(unit, "unit is null");
+        Objects.requireNonNull(scheduler, "scheduler is null");
         return RxJavaPlugins.onAssembly(new CompletableTimer(delay, unit, scheduler));
     }
 
@@ -1047,9 +1048,9 @@ public static <R> Completable using(
             final Function<? super R, ? extends CompletableSource> completableFunction,
             final Consumer<? super R> disposer,
             final boolean eager) {
-        ObjectHelper.requireNonNull(resourceSupplier, "resourceSupplier is null");
-        ObjectHelper.requireNonNull(completableFunction, "completableFunction is null");
-        ObjectHelper.requireNonNull(disposer, "disposer is null");
+        Objects.requireNonNull(resourceSupplier, "resourceSupplier is null");
+        Objects.requireNonNull(completableFunction, "completableFunction is null");
+        Objects.requireNonNull(disposer, "disposer is null");
 
         return RxJavaPlugins.onAssembly(new CompletableUsing<R>(resourceSupplier, completableFunction, disposer, eager));
     }
@@ -1071,7 +1072,7 @@ public static <R> Completable using(
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public static Completable wrap(CompletableSource source) {
-        ObjectHelper.requireNonNull(source, "source is null");
+        Objects.requireNonNull(source, "source is null");
         if (source instanceof Completable) {
             return RxJavaPlugins.onAssembly((Completable)source);
         }
@@ -1096,7 +1097,7 @@ public static Completable wrap(CompletableSource source) {
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Completable ambWith(CompletableSource other) {
-        ObjectHelper.requireNonNull(other, "other is null");
+        Objects.requireNonNull(other, "other is null");
         return ambArray(this, other);
     }
 
@@ -1120,7 +1121,7 @@ public final Completable ambWith(CompletableSource other) {
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <T> Observable<T> andThen(ObservableSource<T> next) {
-        ObjectHelper.requireNonNull(next, "next is null");
+        Objects.requireNonNull(next, "next is null");
         return RxJavaPlugins.onAssembly(new CompletableAndThenObservable<T>(this, next));
     }
 
@@ -1148,7 +1149,7 @@ public final <T> Observable<T> andThen(ObservableSource<T> next) {
     @BackpressureSupport(BackpressureKind.FULL)
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <T> Flowable<T> andThen(Publisher<T> next) {
-        ObjectHelper.requireNonNull(next, "next is null");
+        Objects.requireNonNull(next, "next is null");
         return RxJavaPlugins.onAssembly(new CompletableAndThenPublisher<T>(this, next));
     }
 
@@ -1172,7 +1173,7 @@ public final <T> Flowable<T> andThen(Publisher<T> next) {
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <T> Single<T> andThen(SingleSource<T> next) {
-        ObjectHelper.requireNonNull(next, "next is null");
+        Objects.requireNonNull(next, "next is null");
         return RxJavaPlugins.onAssembly(new SingleDelayWithCompletable<T>(next, this));
     }
 
@@ -1196,7 +1197,7 @@ public final <T> Single<T> andThen(SingleSource<T> next) {
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <T> Maybe<T> andThen(MaybeSource<T> next) {
-        ObjectHelper.requireNonNull(next, "next is null");
+        Objects.requireNonNull(next, "next is null");
         return RxJavaPlugins.onAssembly(new MaybeDelayWithCompletable<T>(next, this));
     }
 
@@ -1218,7 +1219,7 @@ public final <T> Maybe<T> andThen(MaybeSource<T> next) {
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Completable andThen(CompletableSource next) {
-        ObjectHelper.requireNonNull(next, "next is null");
+        Objects.requireNonNull(next, "next is null");
         return RxJavaPlugins.onAssembly(new CompletableAndThenCompletable(this, next));
     }
 
@@ -1267,7 +1268,7 @@ public final void blockingAwait() {
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public final boolean blockingAwait(long timeout, TimeUnit unit) {
-        ObjectHelper.requireNonNull(unit, "unit is null");
+        Objects.requireNonNull(unit, "unit is null");
         BlockingMultiObserver<Void> observer = new BlockingMultiObserver<Void>();
         subscribe(observer);
         return observer.blockingAwait(timeout, unit);
@@ -1312,7 +1313,7 @@ public final Completable cache() {
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Completable compose(CompletableTransformer transformer) {
-        return wrap(ObjectHelper.requireNonNull(transformer, "transformer is null").apply(this));
+        return wrap(Objects.requireNonNull(transformer, "transformer is null").apply(this));
     }
 
     /**
@@ -1335,7 +1336,7 @@ public final Completable compose(CompletableTransformer transformer) {
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Completable concatWith(CompletableSource other) {
-        ObjectHelper.requireNonNull(other, "other is null");
+        Objects.requireNonNull(other, "other is null");
         return RxJavaPlugins.onAssembly(new CompletableAndThenCompletable(this, other));
     }
 
@@ -1399,8 +1400,8 @@ public final Completable delay(long delay, TimeUnit unit, Scheduler scheduler) {
     @NonNull
     @SchedulerSupport(SchedulerSupport.CUSTOM)
     public final Completable delay(final long delay, final TimeUnit unit, final Scheduler scheduler, final boolean delayError) {
-        ObjectHelper.requireNonNull(unit, "unit is null");
-        ObjectHelper.requireNonNull(scheduler, "scheduler is null");
+        Objects.requireNonNull(unit, "unit is null");
+        Objects.requireNonNull(scheduler, "scheduler is null");
         return RxJavaPlugins.onAssembly(new CompletableDelay(this, delay, unit, scheduler, delayError));
     }
 
@@ -1530,7 +1531,7 @@ public final Completable doOnError(Consumer<? super Throwable> onError) {
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Completable doOnEvent(final Consumer<? super Throwable> onEvent) {
-        ObjectHelper.requireNonNull(onEvent, "onEvent is null");
+        Objects.requireNonNull(onEvent, "onEvent is null");
         return RxJavaPlugins.onAssembly(new CompletableDoOnEvent(this, onEvent));
     }
 
@@ -1558,12 +1559,12 @@ private Completable doOnLifecycle(
             final Action onTerminate,
             final Action onAfterTerminate,
             final Action onDispose) {
-        ObjectHelper.requireNonNull(onSubscribe, "onSubscribe is null");
-        ObjectHelper.requireNonNull(onError, "onError is null");
-        ObjectHelper.requireNonNull(onComplete, "onComplete is null");
-        ObjectHelper.requireNonNull(onTerminate, "onTerminate is null");
-        ObjectHelper.requireNonNull(onAfterTerminate, "onAfterTerminate is null");
-        ObjectHelper.requireNonNull(onDispose, "onDispose is null");
+        Objects.requireNonNull(onSubscribe, "onSubscribe is null");
+        Objects.requireNonNull(onError, "onError is null");
+        Objects.requireNonNull(onComplete, "onComplete is null");
+        Objects.requireNonNull(onTerminate, "onTerminate is null");
+        Objects.requireNonNull(onAfterTerminate, "onAfterTerminate is null");
+        Objects.requireNonNull(onDispose, "onDispose is null");
         return RxJavaPlugins.onAssembly(new CompletablePeek(this, onSubscribe, onError, onComplete, onTerminate, onAfterTerminate, onDispose));
     }
 
@@ -1657,7 +1658,7 @@ public final Completable doAfterTerminate(final Action onAfterTerminate) {
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Completable doFinally(Action onFinally) {
-        ObjectHelper.requireNonNull(onFinally, "onFinally is null");
+        Objects.requireNonNull(onFinally, "onFinally is null");
         return RxJavaPlugins.onAssembly(new CompletableDoFinally(this, onFinally));
     }
 
@@ -1795,7 +1796,7 @@ public final Completable doFinally(Action onFinally) {
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Completable lift(final CompletableOperator onLift) {
-        ObjectHelper.requireNonNull(onLift, "onLift is null");
+        Objects.requireNonNull(onLift, "onLift is null");
         return RxJavaPlugins.onAssembly(new CompletableLift(this, onLift));
     }
 
@@ -1837,7 +1838,7 @@ public final <T> Single<Notification<T>> materialize() {
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Completable mergeWith(CompletableSource other) {
-        ObjectHelper.requireNonNull(other, "other is null");
+        Objects.requireNonNull(other, "other is null");
         return mergeArray(this, other);
     }
 
@@ -1857,7 +1858,7 @@ public final Completable mergeWith(CompletableSource other) {
     @NonNull
     @SchedulerSupport(SchedulerSupport.CUSTOM)
     public final Completable observeOn(final Scheduler scheduler) {
-        ObjectHelper.requireNonNull(scheduler, "scheduler is null");
+        Objects.requireNonNull(scheduler, "scheduler is null");
         return RxJavaPlugins.onAssembly(new CompletableObserveOn(this, scheduler));
     }
 
@@ -1895,7 +1896,7 @@ public final Completable onErrorComplete() {
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Completable onErrorComplete(final Predicate<? super Throwable> predicate) {
-        ObjectHelper.requireNonNull(predicate, "predicate is null");
+        Objects.requireNonNull(predicate, "predicate is null");
 
         return RxJavaPlugins.onAssembly(new CompletableOnErrorComplete(this, predicate));
     }
@@ -1918,7 +1919,7 @@ public final Completable onErrorComplete(final Predicate<? super Throwable> pred
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Completable onErrorResumeNext(final Function<? super Throwable, ? extends CompletableSource> errorMapper) {
-        ObjectHelper.requireNonNull(errorMapper, "errorMapper is null");
+        Objects.requireNonNull(errorMapper, "errorMapper is null");
         return RxJavaPlugins.onAssembly(new CompletableResumeNext(this, errorMapper));
     }
 
@@ -2177,7 +2178,7 @@ public final Completable retryWhen(Function<? super Flowable<Throwable>, ? exten
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Completable startWith(CompletableSource other) {
-        ObjectHelper.requireNonNull(other, "other is null");
+        Objects.requireNonNull(other, "other is null");
         return concatArray(other, this);
     }
 
@@ -2199,7 +2200,7 @@ public final Completable startWith(CompletableSource other) {
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <T> Observable<T> startWith(Observable<T> other) {
-        ObjectHelper.requireNonNull(other, "other is null");
+        Objects.requireNonNull(other, "other is null");
         return other.concatWith(this.<T>toObservable());
     }
     /**
@@ -2224,7 +2225,7 @@ public final <T> Observable<T> startWith(Observable<T> other) {
     @BackpressureSupport(BackpressureKind.FULL)
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <T> Flowable<T> startWith(Publisher<T> other) {
-        ObjectHelper.requireNonNull(other, "other is null");
+        Objects.requireNonNull(other, "other is null");
         return this.<T>toFlowable().startWith(other);
     }
 
@@ -2269,12 +2270,12 @@ public final Disposable subscribe() {
     @SchedulerSupport(SchedulerSupport.NONE)
     @Override
     public final void subscribe(CompletableObserver observer) {
-        ObjectHelper.requireNonNull(observer, "observer is null");
+        Objects.requireNonNull(observer, "observer is null");
         try {
 
             observer = RxJavaPlugins.onSubscribe(this, observer);
 
-            ObjectHelper.requireNonNull(observer, "The RxJavaPlugins.onSubscribe hook returned a null CompletableObserver. Please check the handler provided to RxJavaPlugins.setOnCompletableSubscribe for invalid null returns. Further reading: https://github.com/ReactiveX/RxJava/wiki/Plugins");
+            Objects.requireNonNull(observer, "The RxJavaPlugins.onSubscribe hook returned a null CompletableObserver. Please check the handler provided to RxJavaPlugins.setOnCompletableSubscribe for invalid null returns. Further reading: https://github.com/ReactiveX/RxJava/wiki/Plugins");
 
             subscribeActual(observer);
         } catch (NullPointerException ex) { // NOPMD
@@ -2346,8 +2347,8 @@ public final <E extends CompletableObserver> E subscribeWith(E observer) {
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Disposable subscribe(final Action onComplete, final Consumer<? super Throwable> onError) {
-        ObjectHelper.requireNonNull(onError, "onError is null");
-        ObjectHelper.requireNonNull(onComplete, "onComplete is null");
+        Objects.requireNonNull(onError, "onError is null");
+        Objects.requireNonNull(onComplete, "onComplete is null");
 
         CallbackCompletableObserver observer = new CallbackCompletableObserver(onError, onComplete);
         subscribe(observer);
@@ -2374,7 +2375,7 @@ public final Disposable subscribe(final Action onComplete, final Consumer<? supe
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Disposable subscribe(final Action onComplete) {
-        ObjectHelper.requireNonNull(onComplete, "onComplete is null");
+        Objects.requireNonNull(onComplete, "onComplete is null");
 
         CallbackCompletableObserver observer = new CallbackCompletableObserver(onComplete);
         subscribe(observer);
@@ -2398,7 +2399,7 @@ public final Disposable subscribe(final Action onComplete) {
     @NonNull
     @SchedulerSupport(SchedulerSupport.CUSTOM)
     public final Completable subscribeOn(final Scheduler scheduler) {
-        ObjectHelper.requireNonNull(scheduler, "scheduler is null");
+        Objects.requireNonNull(scheduler, "scheduler is null");
 
         return RxJavaPlugins.onAssembly(new CompletableSubscribeOn(this, scheduler));
     }
@@ -2425,7 +2426,7 @@ public final Completable subscribeOn(final Scheduler scheduler) {
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Completable takeUntil(CompletableSource other) {
-        ObjectHelper.requireNonNull(other, "other is null");
+        Objects.requireNonNull(other, "other is null");
 
         return RxJavaPlugins.onAssembly(new CompletableTakeUntilCompletable(this, other));
     }
@@ -2470,7 +2471,7 @@ public final Completable timeout(long timeout, TimeUnit unit) {
     @NonNull
     @SchedulerSupport(SchedulerSupport.COMPUTATION)
     public final Completable timeout(long timeout, TimeUnit unit, CompletableSource other) {
-        ObjectHelper.requireNonNull(other, "other is null");
+        Objects.requireNonNull(other, "other is null");
         return timeout0(timeout, unit, Schedulers.computation(), other);
     }
 
@@ -2518,7 +2519,7 @@ public final Completable timeout(long timeout, TimeUnit unit, Scheduler schedule
     @NonNull
     @SchedulerSupport(SchedulerSupport.CUSTOM)
     public final Completable timeout(long timeout, TimeUnit unit, Scheduler scheduler, CompletableSource other) {
-        ObjectHelper.requireNonNull(other, "other is null");
+        Objects.requireNonNull(other, "other is null");
         return timeout0(timeout, unit, scheduler, other);
     }
 
@@ -2542,8 +2543,8 @@ public final Completable timeout(long timeout, TimeUnit unit, Scheduler schedule
     @NonNull
     @SchedulerSupport(SchedulerSupport.CUSTOM)
     private Completable timeout0(long timeout, TimeUnit unit, Scheduler scheduler, CompletableSource other) {
-        ObjectHelper.requireNonNull(unit, "unit is null");
-        ObjectHelper.requireNonNull(scheduler, "scheduler is null");
+        Objects.requireNonNull(unit, "unit is null");
+        Objects.requireNonNull(scheduler, "scheduler is null");
         return RxJavaPlugins.onAssembly(new CompletableTimeout(this, timeout, unit, scheduler, other));
     }
 
@@ -2567,7 +2568,7 @@ private Completable timeout0(long timeout, TimeUnit unit, Scheduler scheduler, C
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <R> R to(@NonNull CompletableConverter<? extends R> converter) {
-        return ObjectHelper.requireNonNull(converter, "converter is null").apply(this);
+        return Objects.requireNonNull(converter, "converter is null").apply(this);
     }
 
     /**
@@ -2658,7 +2659,7 @@ public final <T> Observable<T> toObservable() {
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <T> Single<T> toSingle(final Supplier<? extends T> completionValueSupplier) {
-        ObjectHelper.requireNonNull(completionValueSupplier, "completionValueSupplier is null");
+        Objects.requireNonNull(completionValueSupplier, "completionValueSupplier is null");
         return RxJavaPlugins.onAssembly(new CompletableToSingle<T>(this, completionValueSupplier, null));
     }
 
@@ -2680,7 +2681,7 @@ public final <T> Single<T> toSingle(final Supplier<? extends T> completionValueS
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <T> Single<T> toSingleDefault(final T completionValue) {
-        ObjectHelper.requireNonNull(completionValue, "completionValue is null");
+        Objects.requireNonNull(completionValue, "completionValue is null");
         return RxJavaPlugins.onAssembly(new CompletableToSingle<T>(this, null, completionValue));
     }
 
@@ -2701,7 +2702,7 @@ public final <T> Single<T> toSingleDefault(final T completionValue) {
     @NonNull
     @SchedulerSupport(SchedulerSupport.CUSTOM)
     public final Completable unsubscribeOn(final Scheduler scheduler) {
-        ObjectHelper.requireNonNull(scheduler, "scheduler is null");
+        Objects.requireNonNull(scheduler, "scheduler is null");
         return RxJavaPlugins.onAssembly(new CompletableDisposeOn(this, scheduler));
     }
     // -------------------------------------------------------------------------
diff --git a/src/main/java/io/reactivex/rxjava3/core/Flowable.java b/src/main/java/io/reactivex/rxjava3/core/Flowable.java
index 3fed4742e2..514845efbc 100644
--- a/src/main/java/io/reactivex/rxjava3/core/Flowable.java
+++ b/src/main/java/io/reactivex/rxjava3/core/Flowable.java
@@ -184,7 +184,7 @@ public abstract class Flowable<T> implements Publisher<T> {
     @BackpressureSupport(BackpressureKind.PASS_THROUGH)
     @SchedulerSupport(SchedulerSupport.NONE)
     public static <T> Flowable<T> amb(Iterable<? extends Publisher<? extends T>> sources) {
-        ObjectHelper.requireNonNull(sources, "sources is null");
+        Objects.requireNonNull(sources, "sources is null");
         return RxJavaPlugins.onAssembly(new FlowableAmb<T>(null, sources));
     }
 
@@ -215,7 +215,7 @@ public static <T> Flowable<T> amb(Iterable<? extends Publisher<? extends T>> sou
     @SchedulerSupport(SchedulerSupport.NONE)
     @SafeVarargs
     public static <T> Flowable<T> ambArray(Publisher<? extends T>... sources) {
-        ObjectHelper.requireNonNull(sources, "sources is null");
+        Objects.requireNonNull(sources, "sources is null");
         int len = sources.length;
         if (len == 0) {
             return empty();
@@ -324,11 +324,11 @@ public static <T, R> Flowable<R> combineLatestArray(Publisher<? extends T>[] sou
     @NonNull
     @BackpressureSupport(BackpressureKind.FULL)
     public static <T, R> Flowable<R> combineLatestArray(Publisher<? extends T>[] sources, Function<? super Object[], ? extends R> combiner, int bufferSize) {
-        ObjectHelper.requireNonNull(sources, "sources is null");
+        Objects.requireNonNull(sources, "sources is null");
         if (sources.length == 0) {
             return empty();
         }
-        ObjectHelper.requireNonNull(combiner, "combiner is null");
+        Objects.requireNonNull(combiner, "combiner is null");
         ObjectHelper.verifyPositive(bufferSize, "bufferSize");
         return RxJavaPlugins.onAssembly(new FlowableCombineLatest<T, R>(sources, combiner, bufferSize, false));
     }
@@ -423,8 +423,8 @@ public static <T, R> Flowable<R> combineLatest(Iterable<? extends Publisher<? ex
     @BackpressureSupport(BackpressureKind.FULL)
     public static <T, R> Flowable<R> combineLatest(Iterable<? extends Publisher<? extends T>> sources,
             Function<? super Object[], ? extends R> combiner, int bufferSize) {
-        ObjectHelper.requireNonNull(sources, "sources is null");
-        ObjectHelper.requireNonNull(combiner, "combiner is null");
+        Objects.requireNonNull(sources, "sources is null");
+        Objects.requireNonNull(combiner, "combiner is null");
         ObjectHelper.verifyPositive(bufferSize, "bufferSize");
         return RxJavaPlugins.onAssembly(new FlowableCombineLatest<T, R>(sources, combiner, bufferSize, false));
     }
@@ -520,8 +520,8 @@ public static <T, R> Flowable<R> combineLatestDelayError(Publisher<? extends T>[
     @BackpressureSupport(BackpressureKind.FULL)
     public static <T, R> Flowable<R> combineLatestDelayError(Publisher<? extends T>[] sources,
             Function<? super Object[], ? extends R> combiner, int bufferSize) {
-        ObjectHelper.requireNonNull(sources, "sources is null");
-        ObjectHelper.requireNonNull(combiner, "combiner is null");
+        Objects.requireNonNull(sources, "sources is null");
+        Objects.requireNonNull(combiner, "combiner is null");
         ObjectHelper.verifyPositive(bufferSize, "bufferSize");
         if (sources.length == 0) {
             return empty();
@@ -620,8 +620,8 @@ public static <T, R> Flowable<R> combineLatestDelayError(Iterable<? extends Publ
     @BackpressureSupport(BackpressureKind.FULL)
     public static <T, R> Flowable<R> combineLatestDelayError(Iterable<? extends Publisher<? extends T>> sources,
             Function<? super Object[], ? extends R> combiner, int bufferSize) {
-        ObjectHelper.requireNonNull(sources, "sources is null");
-        ObjectHelper.requireNonNull(combiner, "combiner is null");
+        Objects.requireNonNull(sources, "sources is null");
+        Objects.requireNonNull(combiner, "combiner is null");
         ObjectHelper.verifyPositive(bufferSize, "bufferSize");
         return RxJavaPlugins.onAssembly(new FlowableCombineLatest<T, R>(sources, combiner, bufferSize, true));
     }
@@ -665,8 +665,8 @@ public static <T, R> Flowable<R> combineLatestDelayError(Iterable<? extends Publ
     public static <T1, T2, R> Flowable<R> combineLatest(
             Publisher<? extends T1> source1, Publisher<? extends T2> source2,
             BiFunction<? super T1, ? super T2, ? extends R> combiner) {
-        ObjectHelper.requireNonNull(source1, "source1 is null");
-        ObjectHelper.requireNonNull(source2, "source2 is null");
+        Objects.requireNonNull(source1, "source1 is null");
+        Objects.requireNonNull(source2, "source2 is null");
         return combineLatestArray(new Publisher[] { source1, source2 }, Functions.toFunction(combiner), bufferSize());
     }
 
@@ -714,9 +714,9 @@ public static <T1, T2, T3, R> Flowable<R> combineLatest(
             Publisher<? extends T1> source1, Publisher<? extends T2> source2,
             Publisher<? extends T3> source3,
             Function3<? super T1, ? super T2, ? super T3, ? extends R> combiner) {
-        ObjectHelper.requireNonNull(source1, "source1 is null");
-        ObjectHelper.requireNonNull(source2, "source2 is null");
-        ObjectHelper.requireNonNull(source3, "source3 is null");
+        Objects.requireNonNull(source1, "source1 is null");
+        Objects.requireNonNull(source2, "source2 is null");
+        Objects.requireNonNull(source3, "source3 is null");
         return combineLatestArray(new Publisher[] { source1, source2, source3 }, Functions.toFunction(combiner), bufferSize());
     }
 
@@ -767,10 +767,10 @@ public static <T1, T2, T3, T4, R> Flowable<R> combineLatest(
             Publisher<? extends T1> source1, Publisher<? extends T2> source2,
             Publisher<? extends T3> source3, Publisher<? extends T4> source4,
             Function4<? super T1, ? super T2, ? super T3, ? super T4, ? extends R> combiner) {
-        ObjectHelper.requireNonNull(source1, "source1 is null");
-        ObjectHelper.requireNonNull(source2, "source2 is null");
-        ObjectHelper.requireNonNull(source3, "source3 is null");
-        ObjectHelper.requireNonNull(source4, "source4 is null");
+        Objects.requireNonNull(source1, "source1 is null");
+        Objects.requireNonNull(source2, "source2 is null");
+        Objects.requireNonNull(source3, "source3 is null");
+        Objects.requireNonNull(source4, "source4 is null");
         return combineLatestArray(new Publisher[] { source1, source2, source3, source4 }, Functions.toFunction(combiner), bufferSize());
     }
 
@@ -825,11 +825,11 @@ public static <T1, T2, T3, T4, T5, R> Flowable<R> combineLatest(
             Publisher<? extends T3> source3, Publisher<? extends T4> source4,
             Publisher<? extends T5> source5,
             Function5<? super T1, ? super T2, ? super T3, ? super T4, ? super T5, ? extends R> combiner) {
-        ObjectHelper.requireNonNull(source1, "source1 is null");
-        ObjectHelper.requireNonNull(source2, "source2 is null");
-        ObjectHelper.requireNonNull(source3, "source3 is null");
-        ObjectHelper.requireNonNull(source4, "source4 is null");
-        ObjectHelper.requireNonNull(source5, "source5 is null");
+        Objects.requireNonNull(source1, "source1 is null");
+        Objects.requireNonNull(source2, "source2 is null");
+        Objects.requireNonNull(source3, "source3 is null");
+        Objects.requireNonNull(source4, "source4 is null");
+        Objects.requireNonNull(source5, "source5 is null");
         return combineLatestArray(new Publisher[] { source1, source2, source3, source4, source5 }, Functions.toFunction(combiner), bufferSize());
     }
 
@@ -887,12 +887,12 @@ public static <T1, T2, T3, T4, T5, T6, R> Flowable<R> combineLatest(
             Publisher<? extends T3> source3, Publisher<? extends T4> source4,
             Publisher<? extends T5> source5, Publisher<? extends T6> source6,
             Function6<? super T1, ? super T2, ? super T3, ? super T4, ? super T5, ? super T6, ? extends R> combiner) {
-        ObjectHelper.requireNonNull(source1, "source1 is null");
-        ObjectHelper.requireNonNull(source2, "source2 is null");
-        ObjectHelper.requireNonNull(source3, "source3 is null");
-        ObjectHelper.requireNonNull(source4, "source4 is null");
-        ObjectHelper.requireNonNull(source5, "source5 is null");
-        ObjectHelper.requireNonNull(source6, "source6 is null");
+        Objects.requireNonNull(source1, "source1 is null");
+        Objects.requireNonNull(source2, "source2 is null");
+        Objects.requireNonNull(source3, "source3 is null");
+        Objects.requireNonNull(source4, "source4 is null");
+        Objects.requireNonNull(source5, "source5 is null");
+        Objects.requireNonNull(source6, "source6 is null");
         return combineLatestArray(new Publisher[] { source1, source2, source3, source4, source5, source6 }, Functions.toFunction(combiner), bufferSize());
     }
 
@@ -954,13 +954,13 @@ public static <T1, T2, T3, T4, T5, T6, T7, R> Flowable<R> combineLatest(
             Publisher<? extends T5> source5, Publisher<? extends T6> source6,
             Publisher<? extends T7> source7,
             Function7<? super T1, ? super T2, ? super T3, ? super T4, ? super T5, ? super T6, ? super T7, ? extends R> combiner) {
-        ObjectHelper.requireNonNull(source1, "source1 is null");
-        ObjectHelper.requireNonNull(source2, "source2 is null");
-        ObjectHelper.requireNonNull(source3, "source3 is null");
-        ObjectHelper.requireNonNull(source4, "source4 is null");
-        ObjectHelper.requireNonNull(source5, "source5 is null");
-        ObjectHelper.requireNonNull(source6, "source6 is null");
-        ObjectHelper.requireNonNull(source7, "source7 is null");
+        Objects.requireNonNull(source1, "source1 is null");
+        Objects.requireNonNull(source2, "source2 is null");
+        Objects.requireNonNull(source3, "source3 is null");
+        Objects.requireNonNull(source4, "source4 is null");
+        Objects.requireNonNull(source5, "source5 is null");
+        Objects.requireNonNull(source6, "source6 is null");
+        Objects.requireNonNull(source7, "source7 is null");
         return combineLatestArray(new Publisher[] { source1, source2, source3, source4, source5, source6, source7 }, Functions.toFunction(combiner), bufferSize());
     }
 
@@ -1025,14 +1025,14 @@ public static <T1, T2, T3, T4, T5, T6, T7, T8, R> Flowable<R> combineLatest(
             Publisher<? extends T5> source5, Publisher<? extends T6> source6,
             Publisher<? extends T7> source7, Publisher<? extends T8> source8,
             Function8<? super T1, ? super T2, ? super T3, ? super T4, ? super T5, ? super T6, ? super T7, ? super T8, ? extends R> combiner) {
-        ObjectHelper.requireNonNull(source1, "source1 is null");
-        ObjectHelper.requireNonNull(source2, "source2 is null");
-        ObjectHelper.requireNonNull(source3, "source3 is null");
-        ObjectHelper.requireNonNull(source4, "source4 is null");
-        ObjectHelper.requireNonNull(source5, "source5 is null");
-        ObjectHelper.requireNonNull(source6, "source6 is null");
-        ObjectHelper.requireNonNull(source7, "source7 is null");
-        ObjectHelper.requireNonNull(source8, "source8 is null");
+        Objects.requireNonNull(source1, "source1 is null");
+        Objects.requireNonNull(source2, "source2 is null");
+        Objects.requireNonNull(source3, "source3 is null");
+        Objects.requireNonNull(source4, "source4 is null");
+        Objects.requireNonNull(source5, "source5 is null");
+        Objects.requireNonNull(source6, "source6 is null");
+        Objects.requireNonNull(source7, "source7 is null");
+        Objects.requireNonNull(source8, "source8 is null");
         return combineLatestArray(new Publisher[] { source1, source2, source3, source4, source5, source6, source7, source8 }, Functions.toFunction(combiner), bufferSize());
     }
 
@@ -1101,15 +1101,15 @@ public static <T1, T2, T3, T4, T5, T6, T7, T8, T9, R> Flowable<R> combineLatest(
             Publisher<? extends T7> source7, Publisher<? extends T8> source8,
             Publisher<? extends T9> source9,
             Function9<? super T1, ? super T2, ? super T3, ? super T4, ? super T5, ? super T6, ? super T7, ? super T8, ? super T9, ? extends R> combiner) {
-        ObjectHelper.requireNonNull(source1, "source1 is null");
-        ObjectHelper.requireNonNull(source2, "source2 is null");
-        ObjectHelper.requireNonNull(source3, "source3 is null");
-        ObjectHelper.requireNonNull(source4, "source4 is null");
-        ObjectHelper.requireNonNull(source5, "source5 is null");
-        ObjectHelper.requireNonNull(source6, "source6 is null");
-        ObjectHelper.requireNonNull(source7, "source7 is null");
-        ObjectHelper.requireNonNull(source8, "source8 is null");
-        ObjectHelper.requireNonNull(source9, "source9 is null");
+        Objects.requireNonNull(source1, "source1 is null");
+        Objects.requireNonNull(source2, "source2 is null");
+        Objects.requireNonNull(source3, "source3 is null");
+        Objects.requireNonNull(source4, "source4 is null");
+        Objects.requireNonNull(source5, "source5 is null");
+        Objects.requireNonNull(source6, "source6 is null");
+        Objects.requireNonNull(source7, "source7 is null");
+        Objects.requireNonNull(source8, "source8 is null");
+        Objects.requireNonNull(source9, "source9 is null");
         return combineLatestArray(new Publisher[] { source1, source2, source3, source4, source5, source6, source7, source8, source9 }, Functions.toFunction(combiner), bufferSize());
     }
 
@@ -1137,7 +1137,7 @@ public static <T1, T2, T3, T4, T5, T6, T7, T8, T9, R> Flowable<R> combineLatest(
     @BackpressureSupport(BackpressureKind.FULL)
     @SchedulerSupport(SchedulerSupport.NONE)
     public static <T> Flowable<T> concat(Iterable<? extends Publisher<? extends T>> sources) {
-        ObjectHelper.requireNonNull(sources, "sources is null");
+        Objects.requireNonNull(sources, "sources is null");
         // unlike general sources, fromIterable can only throw on a boundary because it is consumed only there
         return fromIterable(sources).concatMapDelayError((Function)Functions.identity(), false, 2);
     }
@@ -1232,8 +1232,8 @@ public static <T> Flowable<T> concat(Publisher<? extends Publisher<? extends T>>
     @BackpressureSupport(BackpressureKind.FULL)
     @SchedulerSupport(SchedulerSupport.NONE)
     public static <T> Flowable<T> concat(Publisher<? extends T> source1, Publisher<? extends T> source2) {
-        ObjectHelper.requireNonNull(source1, "source1 is null");
-        ObjectHelper.requireNonNull(source2, "source2 is null");
+        Objects.requireNonNull(source1, "source1 is null");
+        Objects.requireNonNull(source2, "source2 is null");
         return concatArray(source1, source2);
     }
 
@@ -1270,9 +1270,9 @@ public static <T> Flowable<T> concat(Publisher<? extends T> source1, Publisher<?
     public static <T> Flowable<T> concat(
             Publisher<? extends T> source1, Publisher<? extends T> source2,
             Publisher<? extends T> source3) {
-        ObjectHelper.requireNonNull(source1, "source1 is null");
-        ObjectHelper.requireNonNull(source2, "source2 is null");
-        ObjectHelper.requireNonNull(source3, "source3 is null");
+        Objects.requireNonNull(source1, "source1 is null");
+        Objects.requireNonNull(source2, "source2 is null");
+        Objects.requireNonNull(source3, "source3 is null");
         return concatArray(source1, source2, source3);
     }
 
@@ -1311,10 +1311,10 @@ public static <T> Flowable<T> concat(
     public static <T> Flowable<T> concat(
             Publisher<? extends T> source1, Publisher<? extends T> source2,
             Publisher<? extends T> source3, Publisher<? extends T> source4) {
-        ObjectHelper.requireNonNull(source1, "source1 is null");
-        ObjectHelper.requireNonNull(source2, "source2 is null");
-        ObjectHelper.requireNonNull(source3, "source3 is null");
-        ObjectHelper.requireNonNull(source4, "source4 is null");
+        Objects.requireNonNull(source1, "source1 is null");
+        Objects.requireNonNull(source2, "source2 is null");
+        Objects.requireNonNull(source3, "source3 is null");
+        Objects.requireNonNull(source4, "source4 is null");
         return concatArray(source1, source2, source3, source4);
     }
 
@@ -1446,7 +1446,7 @@ public static <T> Flowable<T> concatArrayEager(Publisher<? extends T>... sources
     @SchedulerSupport(SchedulerSupport.NONE)
     @SuppressWarnings({ "rawtypes", "unchecked" })
     public static <T> Flowable<T> concatArrayEager(int maxConcurrency, int prefetch, Publisher<? extends T>... sources) {
-        ObjectHelper.requireNonNull(sources, "sources is null");
+        Objects.requireNonNull(sources, "sources is null");
         ObjectHelper.verifyPositive(maxConcurrency, "maxConcurrency");
         ObjectHelper.verifyPositive(prefetch, "prefetch");
         return RxJavaPlugins.onAssembly(new FlowableConcatMapEager(new FlowableFromArray(sources), Functions.identity(), maxConcurrency, prefetch, ErrorMode.IMMEDIATE));
@@ -1541,7 +1541,7 @@ public static <T> Flowable<T> concatArrayEagerDelayError(int maxConcurrency, int
     @BackpressureSupport(BackpressureKind.FULL)
     @SchedulerSupport(SchedulerSupport.NONE)
     public static <T> Flowable<T> concatDelayError(Iterable<? extends Publisher<? extends T>> sources) {
-        ObjectHelper.requireNonNull(sources, "sources is null");
+        Objects.requireNonNull(sources, "sources is null");
         return fromIterable(sources).concatMapDelayError((Function)Functions.identity());
     }
 
@@ -1647,7 +1647,7 @@ public static <T> Flowable<T> concatEager(Publisher<? extends Publisher<? extend
     @SchedulerSupport(SchedulerSupport.NONE)
     @SuppressWarnings({ "rawtypes", "unchecked" })
     public static <T> Flowable<T> concatEager(Publisher<? extends Publisher<? extends T>> sources, int maxConcurrency, int prefetch) {
-        ObjectHelper.requireNonNull(sources, "sources is null");
+        Objects.requireNonNull(sources, "sources is null");
         ObjectHelper.verifyPositive(maxConcurrency, "maxConcurrency");
         ObjectHelper.verifyPositive(prefetch, "prefetch");
         return RxJavaPlugins.onAssembly(new FlowableConcatMapEagerPublisher(sources, Functions.identity(), maxConcurrency, prefetch, ErrorMode.IMMEDIATE));
@@ -1707,7 +1707,7 @@ public static <T> Flowable<T> concatEager(Iterable<? extends Publisher<? extends
     @SchedulerSupport(SchedulerSupport.NONE)
     @SuppressWarnings({ "rawtypes", "unchecked" })
     public static <T> Flowable<T> concatEager(Iterable<? extends Publisher<? extends T>> sources, int maxConcurrency, int prefetch) {
-        ObjectHelper.requireNonNull(sources, "sources is null");
+        Objects.requireNonNull(sources, "sources is null");
         ObjectHelper.verifyPositive(maxConcurrency, "maxConcurrency");
         ObjectHelper.verifyPositive(prefetch, "prefetch");
         return RxJavaPlugins.onAssembly(new FlowableConcatMapEager(new FlowableFromIterable(sources), Functions.identity(), maxConcurrency, prefetch, ErrorMode.IMMEDIATE));
@@ -1770,8 +1770,8 @@ public static <T> Flowable<T> concatEager(Iterable<? extends Publisher<? extends
     @BackpressureSupport(BackpressureKind.SPECIAL)
     @SchedulerSupport(SchedulerSupport.NONE)
     public static <T> Flowable<T> create(FlowableOnSubscribe<T> source, BackpressureStrategy mode) {
-        ObjectHelper.requireNonNull(source, "source is null");
-        ObjectHelper.requireNonNull(mode, "mode is null");
+        Objects.requireNonNull(source, "source is null");
+        Objects.requireNonNull(mode, "mode is null");
         return RxJavaPlugins.onAssembly(new FlowableCreate<T>(source, mode));
     }
 
@@ -1807,7 +1807,7 @@ public static <T> Flowable<T> create(FlowableOnSubscribe<T> source, Backpressure
     @BackpressureSupport(BackpressureKind.PASS_THROUGH)
     @SchedulerSupport(SchedulerSupport.NONE)
     public static <T> Flowable<T> defer(Supplier<? extends Publisher<? extends T>> supplier) {
-        ObjectHelper.requireNonNull(supplier, "supplier is null");
+        Objects.requireNonNull(supplier, "supplier is null");
         return RxJavaPlugins.onAssembly(new FlowableDefer<T>(supplier));
     }
 
@@ -1862,7 +1862,7 @@ public static <T> Flowable<T> empty() {
     @BackpressureSupport(BackpressureKind.PASS_THROUGH)
     @SchedulerSupport(SchedulerSupport.NONE)
     public static <T> Flowable<T> error(Supplier<? extends Throwable> supplier) {
-        ObjectHelper.requireNonNull(supplier, "supplier is null");
+        Objects.requireNonNull(supplier, "supplier is null");
         return RxJavaPlugins.onAssembly(new FlowableError<T>(supplier));
     }
 
@@ -1891,7 +1891,7 @@ public static <T> Flowable<T> error(Supplier<? extends Throwable> supplier) {
     @BackpressureSupport(BackpressureKind.PASS_THROUGH)
     @SchedulerSupport(SchedulerSupport.NONE)
     public static <T> Flowable<T> error(final Throwable throwable) {
-        ObjectHelper.requireNonNull(throwable, "throwable is null");
+        Objects.requireNonNull(throwable, "throwable is null");
         return error(Functions.justSupplier(throwable));
     }
 
@@ -1920,7 +1920,7 @@ public static <T> Flowable<T> error(final Throwable throwable) {
     @SchedulerSupport(SchedulerSupport.NONE)
     @SafeVarargs
     public static <T> Flowable<T> fromArray(T... items) {
-        ObjectHelper.requireNonNull(items, "items is null");
+        Objects.requireNonNull(items, "items is null");
         if (items.length == 0) {
             return empty();
         }
@@ -1967,7 +1967,7 @@ public static <T> Flowable<T> fromArray(T... items) {
     @BackpressureSupport(BackpressureKind.FULL)
     @SchedulerSupport(SchedulerSupport.NONE)
     public static <T> Flowable<T> fromCallable(Callable<? extends T> supplier) {
-        ObjectHelper.requireNonNull(supplier, "supplier is null");
+        Objects.requireNonNull(supplier, "supplier is null");
         return RxJavaPlugins.onAssembly(new FlowableFromCallable<T>(supplier));
     }
 
@@ -2009,7 +2009,7 @@ public static <T> Flowable<T> fromCallable(Callable<? extends T> supplier) {
     @BackpressureSupport(BackpressureKind.FULL)
     @SchedulerSupport(SchedulerSupport.NONE)
     public static <T> Flowable<T> fromFuture(Future<? extends T> future) {
-        ObjectHelper.requireNonNull(future, "future is null");
+        Objects.requireNonNull(future, "future is null");
         return RxJavaPlugins.onAssembly(new FlowableFromFuture<T>(future, 0L, null));
     }
 
@@ -2055,8 +2055,8 @@ public static <T> Flowable<T> fromFuture(Future<? extends T> future) {
     @BackpressureSupport(BackpressureKind.FULL)
     @SchedulerSupport(SchedulerSupport.NONE)
     public static <T> Flowable<T> fromFuture(Future<? extends T> future, long timeout, TimeUnit unit) {
-        ObjectHelper.requireNonNull(future, "future is null");
-        ObjectHelper.requireNonNull(unit, "unit is null");
+        Objects.requireNonNull(future, "future is null");
+        Objects.requireNonNull(unit, "unit is null");
         return RxJavaPlugins.onAssembly(new FlowableFromFuture<T>(future, timeout, unit));
     }
 
@@ -2106,7 +2106,7 @@ public static <T> Flowable<T> fromFuture(Future<? extends T> future, long timeou
     @BackpressureSupport(BackpressureKind.FULL)
     @SchedulerSupport(SchedulerSupport.CUSTOM)
     public static <T> Flowable<T> fromFuture(Future<? extends T> future, long timeout, TimeUnit unit, Scheduler scheduler) {
-        ObjectHelper.requireNonNull(scheduler, "scheduler is null");
+        Objects.requireNonNull(scheduler, "scheduler is null");
         return fromFuture((Future<T>)future, timeout, unit).subscribeOn(scheduler);
     }
 
@@ -2145,7 +2145,7 @@ public static <T> Flowable<T> fromFuture(Future<? extends T> future, long timeou
     @BackpressureSupport(BackpressureKind.FULL)
     @SchedulerSupport(SchedulerSupport.CUSTOM)
     public static <T> Flowable<T> fromFuture(Future<? extends T> future, Scheduler scheduler) {
-        ObjectHelper.requireNonNull(scheduler, "scheduler is null");
+        Objects.requireNonNull(scheduler, "scheduler is null");
         return fromFuture((Future<T>)future).subscribeOn(scheduler);
     }
 
@@ -2175,7 +2175,7 @@ public static <T> Flowable<T> fromFuture(Future<? extends T> future, Scheduler s
     @BackpressureSupport(BackpressureKind.FULL)
     @SchedulerSupport(SchedulerSupport.NONE)
     public static <T> Flowable<T> fromIterable(Iterable<? extends T> source) {
-        ObjectHelper.requireNonNull(source, "source is null");
+        Objects.requireNonNull(source, "source is null");
         return RxJavaPlugins.onAssembly(new FlowableFromIterable<T>(source));
     }
 
@@ -2215,7 +2215,7 @@ public static <T> Flowable<T> fromPublisher(final Publisher<? extends T> source)
         if (source instanceof Flowable) {
             return RxJavaPlugins.onAssembly((Flowable<T>)source);
         }
-        ObjectHelper.requireNonNull(source, "source is null");
+        Objects.requireNonNull(source, "source is null");
 
         return RxJavaPlugins.onAssembly(new FlowableFromPublisher<T>(source));
     }
@@ -2257,7 +2257,7 @@ public static <T> Flowable<T> fromPublisher(final Publisher<? extends T> source)
     @BackpressureSupport(BackpressureKind.FULL)
     @SchedulerSupport(SchedulerSupport.NONE)
     public static <T> Flowable<T> fromSupplier(Supplier<? extends T> supplier) {
-        ObjectHelper.requireNonNull(supplier, "supplier is null");
+        Objects.requireNonNull(supplier, "supplier is null");
         return RxJavaPlugins.onAssembly(new FlowableFromSupplier<T>(supplier));
     }
 
@@ -2287,7 +2287,7 @@ public static <T> Flowable<T> fromSupplier(Supplier<? extends T> supplier) {
     @BackpressureSupport(BackpressureKind.FULL)
     @SchedulerSupport(SchedulerSupport.NONE)
     public static <T> Flowable<T> generate(final Consumer<Emitter<T>> generator) {
-        ObjectHelper.requireNonNull(generator, "generator is null");
+        Objects.requireNonNull(generator, "generator is null");
         return generate(Functions.nullSupplier(),
                 FlowableInternalHelper.<T, Object>simpleGenerator(generator),
                 Functions.emptyConsumer());
@@ -2321,7 +2321,7 @@ public static <T> Flowable<T> generate(final Consumer<Emitter<T>> generator) {
     @BackpressureSupport(BackpressureKind.FULL)
     @SchedulerSupport(SchedulerSupport.NONE)
     public static <T, S> Flowable<T> generate(Supplier<S> initialState, final BiConsumer<S, Emitter<T>> generator) {
-        ObjectHelper.requireNonNull(generator, "generator is null");
+        Objects.requireNonNull(generator, "generator is null");
         return generate(initialState, FlowableInternalHelper.<T, S>simpleBiGenerator(generator),
                 Functions.emptyConsumer());
     }
@@ -2357,7 +2357,7 @@ public static <T, S> Flowable<T> generate(Supplier<S> initialState, final BiCons
     @SchedulerSupport(SchedulerSupport.NONE)
     public static <T, S> Flowable<T> generate(Supplier<S> initialState, final BiConsumer<S, Emitter<T>> generator,
             Consumer<? super S> disposeState) {
-        ObjectHelper.requireNonNull(generator, "generator is null");
+        Objects.requireNonNull(generator, "generator is null");
         return generate(initialState, FlowableInternalHelper.<T, S>simpleBiGenerator(generator), disposeState);
     }
 
@@ -2423,9 +2423,9 @@ public static <T, S> Flowable<T> generate(Supplier<S> initialState, BiFunction<S
     @BackpressureSupport(BackpressureKind.FULL)
     @SchedulerSupport(SchedulerSupport.NONE)
     public static <T, S> Flowable<T> generate(Supplier<S> initialState, BiFunction<S, Emitter<T>, S> generator, Consumer<? super S> disposeState) {
-        ObjectHelper.requireNonNull(initialState, "initialState is null");
-        ObjectHelper.requireNonNull(generator, "generator is null");
-        ObjectHelper.requireNonNull(disposeState, "disposeState is null");
+        Objects.requireNonNull(initialState, "initialState is null");
+        Objects.requireNonNull(generator, "generator is null");
+        Objects.requireNonNull(disposeState, "disposeState is null");
         return RxJavaPlugins.onAssembly(new FlowableGenerate<T, S>(initialState, generator, disposeState));
     }
 
@@ -2493,8 +2493,8 @@ public static Flowable<Long> interval(long initialDelay, long period, TimeUnit u
     @BackpressureSupport(BackpressureKind.ERROR)
     @SchedulerSupport(SchedulerSupport.CUSTOM)
     public static Flowable<Long> interval(long initialDelay, long period, TimeUnit unit, Scheduler scheduler) {
-        ObjectHelper.requireNonNull(unit, "unit is null");
-        ObjectHelper.requireNonNull(scheduler, "scheduler is null");
+        Objects.requireNonNull(unit, "unit is null");
+        Objects.requireNonNull(scheduler, "scheduler is null");
         return RxJavaPlugins.onAssembly(new FlowableInterval(Math.max(0L, initialDelay), Math.max(0L, period), unit, scheduler));
     }
 
@@ -2612,8 +2612,8 @@ public static Flowable<Long> intervalRange(long start, long count, long initialD
         if (start > 0 && end < 0) {
             throw new IllegalArgumentException("Overflow! start + count is bigger than Long.MAX_VALUE");
         }
-        ObjectHelper.requireNonNull(unit, "unit is null");
-        ObjectHelper.requireNonNull(scheduler, "scheduler is null");
+        Objects.requireNonNull(unit, "unit is null");
+        Objects.requireNonNull(scheduler, "scheduler is null");
 
         return RxJavaPlugins.onAssembly(new FlowableIntervalRange(start, end, Math.max(0L, initialDelay), Math.max(0L, period), unit, scheduler));
     }
@@ -2653,7 +2653,7 @@ public static Flowable<Long> intervalRange(long start, long count, long initialD
     @BackpressureSupport(BackpressureKind.FULL)
     @SchedulerSupport(SchedulerSupport.NONE)
     public static <T> Flowable<T> just(T item) {
-        ObjectHelper.requireNonNull(item, "item is null");
+        Objects.requireNonNull(item, "item is null");
         return RxJavaPlugins.onAssembly(new FlowableJust<T>(item));
     }
 
@@ -2682,8 +2682,8 @@ public static <T> Flowable<T> just(T item) {
     @BackpressureSupport(BackpressureKind.FULL)
     @SchedulerSupport(SchedulerSupport.NONE)
     public static <T> Flowable<T> just(T item1, T item2) {
-        ObjectHelper.requireNonNull(item1, "item1 is null");
-        ObjectHelper.requireNonNull(item2, "item2 is null");
+        Objects.requireNonNull(item1, "item1 is null");
+        Objects.requireNonNull(item2, "item2 is null");
 
         return fromArray(item1, item2);
     }
@@ -2715,9 +2715,9 @@ public static <T> Flowable<T> just(T item1, T item2) {
     @BackpressureSupport(BackpressureKind.FULL)
     @SchedulerSupport(SchedulerSupport.NONE)
     public static <T> Flowable<T> just(T item1, T item2, T item3) {
-        ObjectHelper.requireNonNull(item1, "item1 is null");
-        ObjectHelper.requireNonNull(item2, "item2 is null");
-        ObjectHelper.requireNonNull(item3, "item3 is null");
+        Objects.requireNonNull(item1, "item1 is null");
+        Objects.requireNonNull(item2, "item2 is null");
+        Objects.requireNonNull(item3, "item3 is null");
 
         return fromArray(item1, item2, item3);
     }
@@ -2751,10 +2751,10 @@ public static <T> Flowable<T> just(T item1, T item2, T item3) {
     @BackpressureSupport(BackpressureKind.FULL)
     @SchedulerSupport(SchedulerSupport.NONE)
     public static <T> Flowable<T> just(T item1, T item2, T item3, T item4) {
-        ObjectHelper.requireNonNull(item1, "item1 is null");
-        ObjectHelper.requireNonNull(item2, "item2 is null");
-        ObjectHelper.requireNonNull(item3, "item3 is null");
-        ObjectHelper.requireNonNull(item4, "item4 is null");
+        Objects.requireNonNull(item1, "item1 is null");
+        Objects.requireNonNull(item2, "item2 is null");
+        Objects.requireNonNull(item3, "item3 is null");
+        Objects.requireNonNull(item4, "item4 is null");
 
         return fromArray(item1, item2, item3, item4);
     }
@@ -2790,11 +2790,11 @@ public static <T> Flowable<T> just(T item1, T item2, T item3, T item4) {
     @BackpressureSupport(BackpressureKind.FULL)
     @SchedulerSupport(SchedulerSupport.NONE)
     public static <T> Flowable<T> just(T item1, T item2, T item3, T item4, T item5) {
-        ObjectHelper.requireNonNull(item1, "item1 is null");
-        ObjectHelper.requireNonNull(item2, "item2 is null");
-        ObjectHelper.requireNonNull(item3, "item3 is null");
-        ObjectHelper.requireNonNull(item4, "item4 is null");
-        ObjectHelper.requireNonNull(item5, "item5 is null");
+        Objects.requireNonNull(item1, "item1 is null");
+        Objects.requireNonNull(item2, "item2 is null");
+        Objects.requireNonNull(item3, "item3 is null");
+        Objects.requireNonNull(item4, "item4 is null");
+        Objects.requireNonNull(item5, "item5 is null");
 
         return fromArray(item1, item2, item3, item4, item5);
     }
@@ -2832,12 +2832,12 @@ public static <T> Flowable<T> just(T item1, T item2, T item3, T item4, T item5)
     @BackpressureSupport(BackpressureKind.FULL)
     @SchedulerSupport(SchedulerSupport.NONE)
     public static <T> Flowable<T> just(T item1, T item2, T item3, T item4, T item5, T item6) {
-        ObjectHelper.requireNonNull(item1, "item1 is null");
-        ObjectHelper.requireNonNull(item2, "item2 is null");
-        ObjectHelper.requireNonNull(item3, "item3 is null");
-        ObjectHelper.requireNonNull(item4, "item4 is null");
-        ObjectHelper.requireNonNull(item5, "item5 is null");
-        ObjectHelper.requireNonNull(item6, "item6 is null");
+        Objects.requireNonNull(item1, "item1 is null");
+        Objects.requireNonNull(item2, "item2 is null");
+        Objects.requireNonNull(item3, "item3 is null");
+        Objects.requireNonNull(item4, "item4 is null");
+        Objects.requireNonNull(item5, "item5 is null");
+        Objects.requireNonNull(item6, "item6 is null");
 
         return fromArray(item1, item2, item3, item4, item5, item6);
     }
@@ -2877,13 +2877,13 @@ public static <T> Flowable<T> just(T item1, T item2, T item3, T item4, T item5,
     @BackpressureSupport(BackpressureKind.FULL)
     @SchedulerSupport(SchedulerSupport.NONE)
     public static <T> Flowable<T> just(T item1, T item2, T item3, T item4, T item5, T item6, T item7) {
-        ObjectHelper.requireNonNull(item1, "item1 is null");
-        ObjectHelper.requireNonNull(item2, "item2 is null");
-        ObjectHelper.requireNonNull(item3, "item3 is null");
-        ObjectHelper.requireNonNull(item4, "item4 is null");
-        ObjectHelper.requireNonNull(item5, "item5 is null");
-        ObjectHelper.requireNonNull(item6, "item6 is null");
-        ObjectHelper.requireNonNull(item7, "item7 is null");
+        Objects.requireNonNull(item1, "item1 is null");
+        Objects.requireNonNull(item2, "item2 is null");
+        Objects.requireNonNull(item3, "item3 is null");
+        Objects.requireNonNull(item4, "item4 is null");
+        Objects.requireNonNull(item5, "item5 is null");
+        Objects.requireNonNull(item6, "item6 is null");
+        Objects.requireNonNull(item7, "item7 is null");
 
         return fromArray(item1, item2, item3, item4, item5, item6, item7);
     }
@@ -2925,14 +2925,14 @@ public static <T> Flowable<T> just(T item1, T item2, T item3, T item4, T item5,
     @BackpressureSupport(BackpressureKind.FULL)
     @SchedulerSupport(SchedulerSupport.NONE)
     public static <T> Flowable<T> just(T item1, T item2, T item3, T item4, T item5, T item6, T item7, T item8) {
-        ObjectHelper.requireNonNull(item1, "item1 is null");
-        ObjectHelper.requireNonNull(item2, "item2 is null");
-        ObjectHelper.requireNonNull(item3, "item3 is null");
-        ObjectHelper.requireNonNull(item4, "item4 is null");
-        ObjectHelper.requireNonNull(item5, "item5 is null");
-        ObjectHelper.requireNonNull(item6, "item6 is null");
-        ObjectHelper.requireNonNull(item7, "item7 is null");
-        ObjectHelper.requireNonNull(item8, "item8 is null");
+        Objects.requireNonNull(item1, "item1 is null");
+        Objects.requireNonNull(item2, "item2 is null");
+        Objects.requireNonNull(item3, "item3 is null");
+        Objects.requireNonNull(item4, "item4 is null");
+        Objects.requireNonNull(item5, "item5 is null");
+        Objects.requireNonNull(item6, "item6 is null");
+        Objects.requireNonNull(item7, "item7 is null");
+        Objects.requireNonNull(item8, "item8 is null");
 
         return fromArray(item1, item2, item3, item4, item5, item6, item7, item8);
     }
@@ -2976,15 +2976,15 @@ public static <T> Flowable<T> just(T item1, T item2, T item3, T item4, T item5,
     @BackpressureSupport(BackpressureKind.FULL)
     @SchedulerSupport(SchedulerSupport.NONE)
     public static <T> Flowable<T> just(T item1, T item2, T item3, T item4, T item5, T item6, T item7, T item8, T item9) {
-        ObjectHelper.requireNonNull(item1, "item1 is null");
-        ObjectHelper.requireNonNull(item2, "item2 is null");
-        ObjectHelper.requireNonNull(item3, "item3 is null");
-        ObjectHelper.requireNonNull(item4, "item4 is null");
-        ObjectHelper.requireNonNull(item5, "item5 is null");
-        ObjectHelper.requireNonNull(item6, "item6 is null");
-        ObjectHelper.requireNonNull(item7, "item7 is null");
-        ObjectHelper.requireNonNull(item8, "item8 is null");
-        ObjectHelper.requireNonNull(item9, "item9 is null");
+        Objects.requireNonNull(item1, "item1 is null");
+        Objects.requireNonNull(item2, "item2 is null");
+        Objects.requireNonNull(item3, "item3 is null");
+        Objects.requireNonNull(item4, "item4 is null");
+        Objects.requireNonNull(item5, "item5 is null");
+        Objects.requireNonNull(item6, "item6 is null");
+        Objects.requireNonNull(item7, "item7 is null");
+        Objects.requireNonNull(item8, "item8 is null");
+        Objects.requireNonNull(item9, "item9 is null");
 
         return fromArray(item1, item2, item3, item4, item5, item6, item7, item8, item9);
     }
@@ -3030,16 +3030,16 @@ public static <T> Flowable<T> just(T item1, T item2, T item3, T item4, T item5,
     @BackpressureSupport(BackpressureKind.FULL)
     @SchedulerSupport(SchedulerSupport.NONE)
     public static <T> Flowable<T> just(T item1, T item2, T item3, T item4, T item5, T item6, T item7, T item8, T item9, T item10) {
-        ObjectHelper.requireNonNull(item1, "item1 is null");
-        ObjectHelper.requireNonNull(item2, "item2 is null");
-        ObjectHelper.requireNonNull(item3, "item3 is null");
-        ObjectHelper.requireNonNull(item4, "item4 is null");
-        ObjectHelper.requireNonNull(item5, "item5 is null");
-        ObjectHelper.requireNonNull(item6, "item6 is null");
-        ObjectHelper.requireNonNull(item7, "item7 is null");
-        ObjectHelper.requireNonNull(item8, "item8 is null");
-        ObjectHelper.requireNonNull(item9, "item9 is null");
-        ObjectHelper.requireNonNull(item10, "item10 is null");
+        Objects.requireNonNull(item1, "item1 is null");
+        Objects.requireNonNull(item2, "item2 is null");
+        Objects.requireNonNull(item3, "item3 is null");
+        Objects.requireNonNull(item4, "item4 is null");
+        Objects.requireNonNull(item5, "item5 is null");
+        Objects.requireNonNull(item6, "item6 is null");
+        Objects.requireNonNull(item7, "item7 is null");
+        Objects.requireNonNull(item8, "item8 is null");
+        Objects.requireNonNull(item9, "item9 is null");
+        Objects.requireNonNull(item10, "item10 is null");
 
         return fromArray(item1, item2, item3, item4, item5, item6, item7, item8, item9, item10);
     }
@@ -3421,8 +3421,8 @@ public static <T> Flowable<T> mergeArray(Publisher<? extends T>... sources) {
     @BackpressureSupport(BackpressureKind.FULL)
     @SchedulerSupport(SchedulerSupport.NONE)
     public static <T> Flowable<T> merge(Publisher<? extends T> source1, Publisher<? extends T> source2) {
-        ObjectHelper.requireNonNull(source1, "source1 is null");
-        ObjectHelper.requireNonNull(source2, "source2 is null");
+        Objects.requireNonNull(source1, "source1 is null");
+        Objects.requireNonNull(source2, "source2 is null");
         return fromArray(source1, source2).flatMap((Function)Functions.identity(), false, 2);
     }
 
@@ -3471,9 +3471,9 @@ public static <T> Flowable<T> merge(Publisher<? extends T> source1, Publisher<?
     @BackpressureSupport(BackpressureKind.FULL)
     @SchedulerSupport(SchedulerSupport.NONE)
     public static <T> Flowable<T> merge(Publisher<? extends T> source1, Publisher<? extends T> source2, Publisher<? extends T> source3) {
-        ObjectHelper.requireNonNull(source1, "source1 is null");
-        ObjectHelper.requireNonNull(source2, "source2 is null");
-        ObjectHelper.requireNonNull(source3, "source3 is null");
+        Objects.requireNonNull(source1, "source1 is null");
+        Objects.requireNonNull(source2, "source2 is null");
+        Objects.requireNonNull(source3, "source3 is null");
         return fromArray(source1, source2, source3).flatMap((Function)Functions.identity(), false, 3);
     }
 
@@ -3526,10 +3526,10 @@ public static <T> Flowable<T> merge(Publisher<? extends T> source1, Publisher<?
     public static <T> Flowable<T> merge(
             Publisher<? extends T> source1, Publisher<? extends T> source2,
             Publisher<? extends T> source3, Publisher<? extends T> source4) {
-        ObjectHelper.requireNonNull(source1, "source1 is null");
-        ObjectHelper.requireNonNull(source2, "source2 is null");
-        ObjectHelper.requireNonNull(source3, "source3 is null");
-        ObjectHelper.requireNonNull(source4, "source4 is null");
+        Objects.requireNonNull(source1, "source1 is null");
+        Objects.requireNonNull(source2, "source2 is null");
+        Objects.requireNonNull(source3, "source3 is null");
+        Objects.requireNonNull(source4, "source4 is null");
         return fromArray(source1, source2, source3, source4).flatMap((Function)Functions.identity(), false, 4);
     }
 
@@ -3834,8 +3834,8 @@ public static <T> Flowable<T> mergeArrayDelayError(Publisher<? extends T>... sou
     @BackpressureSupport(BackpressureKind.FULL)
     @SchedulerSupport(SchedulerSupport.NONE)
     public static <T> Flowable<T> mergeDelayError(Publisher<? extends T> source1, Publisher<? extends T> source2) {
-        ObjectHelper.requireNonNull(source1, "source1 is null");
-        ObjectHelper.requireNonNull(source2, "source2 is null");
+        Objects.requireNonNull(source1, "source1 is null");
+        Objects.requireNonNull(source2, "source2 is null");
         return fromArray(source1, source2).flatMap((Function)Functions.identity(), true, 2);
     }
 
@@ -3877,9 +3877,9 @@ public static <T> Flowable<T> mergeDelayError(Publisher<? extends T> source1, Pu
     @BackpressureSupport(BackpressureKind.FULL)
     @SchedulerSupport(SchedulerSupport.NONE)
     public static <T> Flowable<T> mergeDelayError(Publisher<? extends T> source1, Publisher<? extends T> source2, Publisher<? extends T> source3) {
-        ObjectHelper.requireNonNull(source1, "source1 is null");
-        ObjectHelper.requireNonNull(source2, "source2 is null");
-        ObjectHelper.requireNonNull(source3, "source3 is null");
+        Objects.requireNonNull(source1, "source1 is null");
+        Objects.requireNonNull(source2, "source2 is null");
+        Objects.requireNonNull(source3, "source3 is null");
         return fromArray(source1, source2, source3).flatMap((Function)Functions.identity(), true, 3);
     }
 
@@ -3925,10 +3925,10 @@ public static <T> Flowable<T> mergeDelayError(Publisher<? extends T> source1, Pu
     public static <T> Flowable<T> mergeDelayError(
             Publisher<? extends T> source1, Publisher<? extends T> source2,
             Publisher<? extends T> source3, Publisher<? extends T> source4) {
-        ObjectHelper.requireNonNull(source1, "source1 is null");
-        ObjectHelper.requireNonNull(source2, "source2 is null");
-        ObjectHelper.requireNonNull(source3, "source3 is null");
-        ObjectHelper.requireNonNull(source4, "source4 is null");
+        Objects.requireNonNull(source1, "source1 is null");
+        Objects.requireNonNull(source2, "source2 is null");
+        Objects.requireNonNull(source3, "source3 is null");
+        Objects.requireNonNull(source4, "source4 is null");
         return fromArray(source1, source2, source3, source4).flatMap((Function)Functions.identity(), true, 4);
     }
 
@@ -4140,9 +4140,9 @@ public static <T> Single<Boolean> sequenceEqual(Publisher<? extends T> source1,
     @SchedulerSupport(SchedulerSupport.NONE)
     public static <T> Single<Boolean> sequenceEqual(Publisher<? extends T> source1, Publisher<? extends T> source2,
             BiPredicate<? super T, ? super T> isEqual, int bufferSize) {
-        ObjectHelper.requireNonNull(source1, "source1 is null");
-        ObjectHelper.requireNonNull(source2, "source2 is null");
-        ObjectHelper.requireNonNull(isEqual, "isEqual is null");
+        Objects.requireNonNull(source1, "source1 is null");
+        Objects.requireNonNull(source2, "source2 is null");
+        Objects.requireNonNull(isEqual, "isEqual is null");
         ObjectHelper.verifyPositive(bufferSize, "bufferSize");
         return RxJavaPlugins.onAssembly(new FlowableSequenceEqualSingle<T>(source1, source2, isEqual, bufferSize));
     }
@@ -4390,8 +4390,8 @@ public static Flowable<Long> timer(long delay, TimeUnit unit) {
     @BackpressureSupport(BackpressureKind.ERROR)
     @SchedulerSupport(SchedulerSupport.CUSTOM)
     public static Flowable<Long> timer(long delay, TimeUnit unit, Scheduler scheduler) {
-        ObjectHelper.requireNonNull(unit, "unit is null");
-        ObjectHelper.requireNonNull(scheduler, "scheduler is null");
+        Objects.requireNonNull(unit, "unit is null");
+        Objects.requireNonNull(scheduler, "scheduler is null");
 
         return RxJavaPlugins.onAssembly(new FlowableTimer(Math.max(0L, delay), unit, scheduler));
     }
@@ -4419,7 +4419,7 @@ public static Flowable<Long> timer(long delay, TimeUnit unit, Scheduler schedule
     @BackpressureSupport(BackpressureKind.NONE)
     @SchedulerSupport(SchedulerSupport.NONE)
     public static <T> Flowable<T> unsafeCreate(Publisher<T> onSubscribe) {
-        ObjectHelper.requireNonNull(onSubscribe, "onSubscribe is null");
+        Objects.requireNonNull(onSubscribe, "onSubscribe is null");
         if (onSubscribe instanceof Flowable) {
             throw new IllegalArgumentException("unsafeCreate(Flowable) should be upgraded");
         }
@@ -4497,9 +4497,9 @@ public static <T, D> Flowable<T> using(Supplier<? extends D> resourceSupplier,
     public static <T, D> Flowable<T> using(Supplier<? extends D> resourceSupplier,
             Function<? super D, ? extends Publisher<? extends T>> sourceSupplier,
                     Consumer<? super D> resourceDisposer, boolean eager) {
-        ObjectHelper.requireNonNull(resourceSupplier, "resourceSupplier is null");
-        ObjectHelper.requireNonNull(sourceSupplier, "sourceSupplier is null");
-        ObjectHelper.requireNonNull(resourceDisposer, "resourceDisposer is null");
+        Objects.requireNonNull(resourceSupplier, "resourceSupplier is null");
+        Objects.requireNonNull(sourceSupplier, "sourceSupplier is null");
+        Objects.requireNonNull(resourceDisposer, "resourceDisposer is null");
         return RxJavaPlugins.onAssembly(new FlowableUsing<T, D>(resourceSupplier, sourceSupplier, resourceDisposer, eager));
     }
 
@@ -4552,8 +4552,8 @@ public static <T, D> Flowable<T> using(Supplier<? extends D> resourceSupplier,
     @BackpressureSupport(BackpressureKind.FULL)
     @SchedulerSupport(SchedulerSupport.NONE)
     public static <T, R> Flowable<R> zip(Iterable<? extends Publisher<? extends T>> sources, Function<? super Object[], ? extends R> zipper) {
-        ObjectHelper.requireNonNull(zipper, "zipper is null");
-        ObjectHelper.requireNonNull(sources, "sources is null");
+        Objects.requireNonNull(zipper, "zipper is null");
+        Objects.requireNonNull(sources, "sources is null");
         return RxJavaPlugins.onAssembly(new FlowableZip<T, R>(null, sources, zipper, bufferSize(), false));
     }
 
@@ -4613,8 +4613,8 @@ public static <T, R> Flowable<R> zip(Iterable<? extends Publisher<? extends T>>
     public static <T, R> Flowable<R> zip(Iterable<? extends Publisher<? extends T>> sources,
             Function<? super Object[], ? extends R> zipper, boolean delayError,
             int bufferSize) {
-        ObjectHelper.requireNonNull(zipper, "zipper is null");
-        ObjectHelper.requireNonNull(sources, "sources is null");
+        Objects.requireNonNull(zipper, "zipper is null");
+        Objects.requireNonNull(sources, "sources is null");
         ObjectHelper.verifyPositive(bufferSize, "bufferSize");
         return RxJavaPlugins.onAssembly(new FlowableZip<T, R>(null, sources, zipper, bufferSize, delayError));
     }
@@ -4674,8 +4674,8 @@ public static <T, R> Flowable<R> zip(Iterable<? extends Publisher<? extends T>>
     public static <T1, T2, R> Flowable<R> zip(
             Publisher<? extends T1> source1, Publisher<? extends T2> source2,
             BiFunction<? super T1, ? super T2, ? extends R> zipper) {
-        ObjectHelper.requireNonNull(source1, "source1 is null");
-        ObjectHelper.requireNonNull(source2, "source2 is null");
+        Objects.requireNonNull(source1, "source1 is null");
+        Objects.requireNonNull(source2, "source2 is null");
         return zipArray(Functions.toFunction(zipper), false, bufferSize(), source1, source2);
     }
 
@@ -4735,8 +4735,8 @@ public static <T1, T2, R> Flowable<R> zip(
     public static <T1, T2, R> Flowable<R> zip(
             Publisher<? extends T1> source1, Publisher<? extends T2> source2,
             BiFunction<? super T1, ? super T2, ? extends R> zipper, boolean delayError) {
-        ObjectHelper.requireNonNull(source1, "source1 is null");
-        ObjectHelper.requireNonNull(source2, "source2 is null");
+        Objects.requireNonNull(source1, "source1 is null");
+        Objects.requireNonNull(source2, "source2 is null");
         return zipArray(Functions.toFunction(zipper), delayError, bufferSize(), source1, source2);
     }
 
@@ -4797,8 +4797,8 @@ public static <T1, T2, R> Flowable<R> zip(
     public static <T1, T2, R> Flowable<R> zip(
             Publisher<? extends T1> source1, Publisher<? extends T2> source2,
             BiFunction<? super T1, ? super T2, ? extends R> zipper, boolean delayError, int bufferSize) {
-        ObjectHelper.requireNonNull(source1, "source1 is null");
-        ObjectHelper.requireNonNull(source2, "source2 is null");
+        Objects.requireNonNull(source1, "source1 is null");
+        Objects.requireNonNull(source2, "source2 is null");
         return zipArray(Functions.toFunction(zipper), delayError, bufferSize, source1, source2);
     }
 
@@ -4861,9 +4861,9 @@ public static <T1, T2, R> Flowable<R> zip(
     public static <T1, T2, T3, R> Flowable<R> zip(
             Publisher<? extends T1> source1, Publisher<? extends T2> source2, Publisher<? extends T3> source3,
             Function3<? super T1, ? super T2, ? super T3, ? extends R> zipper) {
-        ObjectHelper.requireNonNull(source1, "source1 is null");
-        ObjectHelper.requireNonNull(source2, "source2 is null");
-        ObjectHelper.requireNonNull(source3, "source3 is null");
+        Objects.requireNonNull(source1, "source1 is null");
+        Objects.requireNonNull(source2, "source2 is null");
+        Objects.requireNonNull(source3, "source3 is null");
         return zipArray(Functions.toFunction(zipper), false, bufferSize(), source1, source2, source3);
     }
 
@@ -4930,10 +4930,10 @@ public static <T1, T2, T3, T4, R> Flowable<R> zip(
             Publisher<? extends T1> source1, Publisher<? extends T2> source2, Publisher<? extends T3> source3,
             Publisher<? extends T4> source4,
             Function4<? super T1, ? super T2, ? super T3, ? super T4, ? extends R> zipper) {
-        ObjectHelper.requireNonNull(source1, "source1 is null");
-        ObjectHelper.requireNonNull(source2, "source2 is null");
-        ObjectHelper.requireNonNull(source3, "source3 is null");
-        ObjectHelper.requireNonNull(source4, "source4 is null");
+        Objects.requireNonNull(source1, "source1 is null");
+        Objects.requireNonNull(source2, "source2 is null");
+        Objects.requireNonNull(source3, "source3 is null");
+        Objects.requireNonNull(source4, "source4 is null");
         return zipArray(Functions.toFunction(zipper), false, bufferSize(), source1, source2, source3, source4);
     }
 
@@ -5003,11 +5003,11 @@ public static <T1, T2, T3, T4, T5, R> Flowable<R> zip(
             Publisher<? extends T1> source1, Publisher<? extends T2> source2, Publisher<? extends T3> source3,
             Publisher<? extends T4> source4, Publisher<? extends T5> source5,
             Function5<? super T1, ? super T2, ? super T3, ? super T4, ? super T5, ? extends R> zipper) {
-        ObjectHelper.requireNonNull(source1, "source1 is null");
-        ObjectHelper.requireNonNull(source2, "source2 is null");
-        ObjectHelper.requireNonNull(source3, "source3 is null");
-        ObjectHelper.requireNonNull(source4, "source4 is null");
-        ObjectHelper.requireNonNull(source5, "source5 is null");
+        Objects.requireNonNull(source1, "source1 is null");
+        Objects.requireNonNull(source2, "source2 is null");
+        Objects.requireNonNull(source3, "source3 is null");
+        Objects.requireNonNull(source4, "source4 is null");
+        Objects.requireNonNull(source5, "source5 is null");
         return zipArray(Functions.toFunction(zipper), false, bufferSize(), source1, source2, source3, source4, source5);
     }
 
@@ -5079,12 +5079,12 @@ public static <T1, T2, T3, T4, T5, T6, R> Flowable<R> zip(
             Publisher<? extends T1> source1, Publisher<? extends T2> source2, Publisher<? extends T3> source3,
             Publisher<? extends T4> source4, Publisher<? extends T5> source5, Publisher<? extends T6> source6,
             Function6<? super T1, ? super T2, ? super T3, ? super T4, ? super T5, ? super T6, ? extends R> zipper) {
-        ObjectHelper.requireNonNull(source1, "source1 is null");
-        ObjectHelper.requireNonNull(source2, "source2 is null");
-        ObjectHelper.requireNonNull(source3, "source3 is null");
-        ObjectHelper.requireNonNull(source4, "source4 is null");
-        ObjectHelper.requireNonNull(source5, "source5 is null");
-        ObjectHelper.requireNonNull(source6, "source6 is null");
+        Objects.requireNonNull(source1, "source1 is null");
+        Objects.requireNonNull(source2, "source2 is null");
+        Objects.requireNonNull(source3, "source3 is null");
+        Objects.requireNonNull(source4, "source4 is null");
+        Objects.requireNonNull(source5, "source5 is null");
+        Objects.requireNonNull(source6, "source6 is null");
         return zipArray(Functions.toFunction(zipper), false, bufferSize(), source1, source2, source3, source4, source5, source6);
     }
 
@@ -5160,13 +5160,13 @@ public static <T1, T2, T3, T4, T5, T6, T7, R> Flowable<R> zip(
             Publisher<? extends T4> source4, Publisher<? extends T5> source5, Publisher<? extends T6> source6,
             Publisher<? extends T7> source7,
             Function7<? super T1, ? super T2, ? super T3, ? super T4, ? super T5, ? super T6, ? super T7, ? extends R> zipper) {
-        ObjectHelper.requireNonNull(source1, "source1 is null");
-        ObjectHelper.requireNonNull(source2, "source2 is null");
-        ObjectHelper.requireNonNull(source3, "source3 is null");
-        ObjectHelper.requireNonNull(source4, "source4 is null");
-        ObjectHelper.requireNonNull(source5, "source5 is null");
-        ObjectHelper.requireNonNull(source6, "source6 is null");
-        ObjectHelper.requireNonNull(source7, "source7 is null");
+        Objects.requireNonNull(source1, "source1 is null");
+        Objects.requireNonNull(source2, "source2 is null");
+        Objects.requireNonNull(source3, "source3 is null");
+        Objects.requireNonNull(source4, "source4 is null");
+        Objects.requireNonNull(source5, "source5 is null");
+        Objects.requireNonNull(source6, "source6 is null");
+        Objects.requireNonNull(source7, "source7 is null");
         return zipArray(Functions.toFunction(zipper), false, bufferSize(), source1, source2, source3, source4, source5, source6, source7);
     }
 
@@ -5245,14 +5245,14 @@ public static <T1, T2, T3, T4, T5, T6, T7, T8, R> Flowable<R> zip(
             Publisher<? extends T4> source4, Publisher<? extends T5> source5, Publisher<? extends T6> source6,
             Publisher<? extends T7> source7, Publisher<? extends T8> source8,
             Function8<? super T1, ? super T2, ? super T3, ? super T4, ? super T5, ? super T6, ? super T7, ? super T8, ? extends R> zipper) {
-        ObjectHelper.requireNonNull(source1, "source1 is null");
-        ObjectHelper.requireNonNull(source2, "source2 is null");
-        ObjectHelper.requireNonNull(source3, "source3 is null");
-        ObjectHelper.requireNonNull(source4, "source4 is null");
-        ObjectHelper.requireNonNull(source5, "source5 is null");
-        ObjectHelper.requireNonNull(source6, "source6 is null");
-        ObjectHelper.requireNonNull(source7, "source7 is null");
-        ObjectHelper.requireNonNull(source8, "source8 is null");
+        Objects.requireNonNull(source1, "source1 is null");
+        Objects.requireNonNull(source2, "source2 is null");
+        Objects.requireNonNull(source3, "source3 is null");
+        Objects.requireNonNull(source4, "source4 is null");
+        Objects.requireNonNull(source5, "source5 is null");
+        Objects.requireNonNull(source6, "source6 is null");
+        Objects.requireNonNull(source7, "source7 is null");
+        Objects.requireNonNull(source8, "source8 is null");
         return zipArray(Functions.toFunction(zipper), false, bufferSize(), source1, source2, source3, source4, source5, source6, source7, source8);
     }
 
@@ -5335,15 +5335,15 @@ public static <T1, T2, T3, T4, T5, T6, T7, T8, T9, R> Flowable<R> zip(
             Publisher<? extends T7> source7, Publisher<? extends T8> source8, Publisher<? extends T9> source9,
             Function9<? super T1, ? super T2, ? super T3, ? super T4, ? super T5, ? super T6, ? super T7, ? super T8, ? super T9, ? extends R> zipper) {
 
-        ObjectHelper.requireNonNull(source1, "source1 is null");
-        ObjectHelper.requireNonNull(source2, "source2 is null");
-        ObjectHelper.requireNonNull(source3, "source3 is null");
-        ObjectHelper.requireNonNull(source4, "source4 is null");
-        ObjectHelper.requireNonNull(source5, "source5 is null");
-        ObjectHelper.requireNonNull(source6, "source6 is null");
-        ObjectHelper.requireNonNull(source7, "source7 is null");
-        ObjectHelper.requireNonNull(source8, "source8 is null");
-        ObjectHelper.requireNonNull(source9, "source9 is null");
+        Objects.requireNonNull(source1, "source1 is null");
+        Objects.requireNonNull(source2, "source2 is null");
+        Objects.requireNonNull(source3, "source3 is null");
+        Objects.requireNonNull(source4, "source4 is null");
+        Objects.requireNonNull(source5, "source5 is null");
+        Objects.requireNonNull(source6, "source6 is null");
+        Objects.requireNonNull(source7, "source7 is null");
+        Objects.requireNonNull(source8, "source8 is null");
+        Objects.requireNonNull(source9, "source9 is null");
         return zipArray(Functions.toFunction(zipper), false, bufferSize(), source1, source2, source3, source4, source5, source6, source7, source8, source9);
     }
 
@@ -5406,7 +5406,7 @@ public static <T, R> Flowable<R> zipArray(Function<? super Object[], ? extends R
         if (sources.length == 0) {
             return empty();
         }
-        ObjectHelper.requireNonNull(zipper, "zipper is null");
+        Objects.requireNonNull(zipper, "zipper is null");
         ObjectHelper.verifyPositive(bufferSize, "bufferSize");
         return RxJavaPlugins.onAssembly(new FlowableZip<T, R>(sources, null, zipper, bufferSize, delayError));
     }
@@ -5439,7 +5439,7 @@ public static <T, R> Flowable<R> zipArray(Function<? super Object[], ? extends R
     @BackpressureSupport(BackpressureKind.UNBOUNDED_IN)
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Single<Boolean> all(Predicate<? super T> predicate) {
-        ObjectHelper.requireNonNull(predicate, "predicate is null");
+        Objects.requireNonNull(predicate, "predicate is null");
         return RxJavaPlugins.onAssembly(new FlowableAllSingle<T>(this, predicate));
     }
 
@@ -5468,7 +5468,7 @@ public final Single<Boolean> all(Predicate<? super T> predicate) {
     @BackpressureSupport(BackpressureKind.FULL)
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Flowable<T> ambWith(Publisher<? extends T> other) {
-        ObjectHelper.requireNonNull(other, "other is null");
+        Objects.requireNonNull(other, "other is null");
         return ambArray(this, other);
     }
 
@@ -5500,7 +5500,7 @@ public final Flowable<T> ambWith(Publisher<? extends T> other) {
     @BackpressureSupport(BackpressureKind.UNBOUNDED_IN)
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Single<Boolean> any(Predicate<? super T> predicate) {
-        ObjectHelper.requireNonNull(predicate, "predicate is null");
+        Objects.requireNonNull(predicate, "predicate is null");
         return RxJavaPlugins.onAssembly(new FlowableAnySingle<T>(this, predicate));
     }
 
@@ -6209,7 +6209,7 @@ public final Flowable<List<T>> buffer(int count, int skip) {
     public final <U extends Collection<? super T>> Flowable<U> buffer(int count, int skip, Supplier<U> bufferSupplier) {
         ObjectHelper.verifyPositive(count, "count");
         ObjectHelper.verifyPositive(skip, "skip");
-        ObjectHelper.requireNonNull(bufferSupplier, "bufferSupplier is null");
+        Objects.requireNonNull(bufferSupplier, "bufferSupplier is null");
         return RxJavaPlugins.onAssembly(new FlowableBuffer<T, U>(this, count, skip, bufferSupplier));
     }
 
@@ -6358,9 +6358,9 @@ public final Flowable<List<T>> buffer(long timespan, long timeskip, TimeUnit uni
     @SchedulerSupport(SchedulerSupport.CUSTOM)
     public final <U extends Collection<? super T>> Flowable<U> buffer(long timespan, long timeskip, TimeUnit unit,
             Scheduler scheduler, Supplier<U> bufferSupplier) {
-        ObjectHelper.requireNonNull(unit, "unit is null");
-        ObjectHelper.requireNonNull(scheduler, "scheduler is null");
-        ObjectHelper.requireNonNull(bufferSupplier, "bufferSupplier is null");
+        Objects.requireNonNull(unit, "unit is null");
+        Objects.requireNonNull(scheduler, "scheduler is null");
+        Objects.requireNonNull(bufferSupplier, "bufferSupplier is null");
         return RxJavaPlugins.onAssembly(new FlowableBufferTimed<T, U>(this, timespan, timeskip, unit, scheduler, bufferSupplier, Integer.MAX_VALUE, false));
     }
 
@@ -6518,9 +6518,9 @@ public final <U extends Collection<? super T>> Flowable<U> buffer(
             Scheduler scheduler, int count,
             Supplier<U> bufferSupplier,
             boolean restartTimerOnMaxSize) {
-        ObjectHelper.requireNonNull(unit, "unit is null");
-        ObjectHelper.requireNonNull(scheduler, "scheduler is null");
-        ObjectHelper.requireNonNull(bufferSupplier, "bufferSupplier is null");
+        Objects.requireNonNull(unit, "unit is null");
+        Objects.requireNonNull(scheduler, "scheduler is null");
+        Objects.requireNonNull(bufferSupplier, "bufferSupplier is null");
         ObjectHelper.verifyPositive(count, "count");
         return RxJavaPlugins.onAssembly(new FlowableBufferTimed<T, U>(this, timespan, timespan, unit, scheduler, bufferSupplier, count, restartTimerOnMaxSize));
     }
@@ -6634,9 +6634,9 @@ public final <TOpening, TClosing, U extends Collection<? super T>> Flowable<U> b
             Flowable<? extends TOpening> openingIndicator,
             Function<? super TOpening, ? extends Publisher<? extends TClosing>> closingIndicator,
             Supplier<U> bufferSupplier) {
-        ObjectHelper.requireNonNull(openingIndicator, "openingIndicator is null");
-        ObjectHelper.requireNonNull(closingIndicator, "closingIndicator is null");
-        ObjectHelper.requireNonNull(bufferSupplier, "bufferSupplier is null");
+        Objects.requireNonNull(openingIndicator, "openingIndicator is null");
+        Objects.requireNonNull(closingIndicator, "closingIndicator is null");
+        Objects.requireNonNull(bufferSupplier, "bufferSupplier is null");
         return RxJavaPlugins.onAssembly(new FlowableBufferBoundary<T, U, TOpening, TClosing>(this, openingIndicator, closingIndicator, bufferSupplier));
     }
 
@@ -6746,8 +6746,8 @@ public final <B> Flowable<List<T>> buffer(Publisher<B> boundaryIndicator, final
     @BackpressureSupport(BackpressureKind.ERROR)
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <B, U extends Collection<? super T>> Flowable<U> buffer(Publisher<B> boundaryIndicator, Supplier<U> bufferSupplier) {
-        ObjectHelper.requireNonNull(boundaryIndicator, "boundaryIndicator is null");
-        ObjectHelper.requireNonNull(bufferSupplier, "bufferSupplier is null");
+        Objects.requireNonNull(boundaryIndicator, "boundaryIndicator is null");
+        Objects.requireNonNull(bufferSupplier, "bufferSupplier is null");
         return RxJavaPlugins.onAssembly(new FlowableBufferExactBoundary<T, U, B>(this, boundaryIndicator, bufferSupplier));
     }
 
@@ -6898,7 +6898,7 @@ public final Flowable<T> cacheWithInitialCapacity(int initialCapacity) {
     @BackpressureSupport(BackpressureKind.PASS_THROUGH)
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <U> Flowable<U> cast(final Class<U> clazz) {
-        ObjectHelper.requireNonNull(clazz, "clazz is null");
+        Objects.requireNonNull(clazz, "clazz is null");
         return map(Functions.castFunction(clazz));
     }
 
@@ -6936,8 +6936,8 @@ public final <U> Flowable<U> cast(final Class<U> clazz) {
     @BackpressureSupport(BackpressureKind.UNBOUNDED_IN)
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <U> Single<U> collect(Supplier<? extends U> initialItemSupplier, BiConsumer<? super U, ? super T> collector) {
-        ObjectHelper.requireNonNull(initialItemSupplier, "initialItemSupplier is null");
-        ObjectHelper.requireNonNull(collector, "collector is null");
+        Objects.requireNonNull(initialItemSupplier, "initialItemSupplier is null");
+        Objects.requireNonNull(collector, "collector is null");
         return RxJavaPlugins.onAssembly(new FlowableCollectSingle<T, U>(this, initialItemSupplier, collector));
     }
 
@@ -6975,7 +6975,7 @@ public final <U> Single<U> collect(Supplier<? extends U> initialItemSupplier, Bi
     @BackpressureSupport(BackpressureKind.UNBOUNDED_IN)
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <U> Single<U> collectInto(final U initialItem, BiConsumer<? super U, ? super T> collector) {
-        ObjectHelper.requireNonNull(initialItem, "initialItem is null");
+        Objects.requireNonNull(initialItem, "initialItem is null");
         return collect(Functions.justSupplier(initialItem), collector);
     }
 
@@ -7006,7 +7006,7 @@ public final <U> Single<U> collectInto(final U initialItem, BiConsumer<? super U
     @BackpressureSupport(BackpressureKind.PASS_THROUGH)
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <R> Flowable<R> compose(FlowableTransformer<? super T, ? extends R> composer) {
-        return fromPublisher(((FlowableTransformer<T, R>) ObjectHelper.requireNonNull(composer, "composer is null")).apply(this));
+        return fromPublisher(((FlowableTransformer<T, R>) Objects.requireNonNull(composer, "composer is null")).apply(this));
     }
 
     /**
@@ -7082,7 +7082,7 @@ public final <R> Flowable<R> concatMap(Function<? super T, ? extends Publisher<?
     @BackpressureSupport(BackpressureKind.FULL)
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <R> Flowable<R> concatMap(Function<? super T, ? extends Publisher<? extends R>> mapper, int prefetch) {
-        ObjectHelper.requireNonNull(mapper, "mapper is null");
+        Objects.requireNonNull(mapper, "mapper is null");
         ObjectHelper.verifyPositive(prefetch, "prefetch");
         if (this instanceof ScalarSupplier) {
             @SuppressWarnings("unchecked")
@@ -7135,9 +7135,9 @@ public final <R> Flowable<R> concatMap(Function<? super T, ? extends Publisher<?
     @BackpressureSupport(BackpressureKind.FULL)
     @SchedulerSupport(SchedulerSupport.CUSTOM)
     public final <R> Flowable<R> concatMap(Function<? super T, ? extends Publisher<? extends R>> mapper, int prefetch, Scheduler scheduler) {
-        ObjectHelper.requireNonNull(mapper, "mapper is null");
+        Objects.requireNonNull(mapper, "mapper is null");
         ObjectHelper.verifyPositive(prefetch, "prefetch");
-        ObjectHelper.requireNonNull(scheduler, "scheduler");
+        Objects.requireNonNull(scheduler, "scheduler");
         return RxJavaPlugins.onAssembly(new FlowableConcatMapScheduler<T, R>(this, mapper, prefetch, ErrorMode.IMMEDIATE, scheduler));
     }
 
@@ -7197,7 +7197,7 @@ public final Completable concatMapCompletable(Function<? super T, ? extends Comp
     @SchedulerSupport(SchedulerSupport.NONE)
     @BackpressureSupport(BackpressureKind.FULL)
     public final Completable concatMapCompletable(Function<? super T, ? extends CompletableSource> mapper, int prefetch) {
-        ObjectHelper.requireNonNull(mapper, "mapper is null");
+        Objects.requireNonNull(mapper, "mapper is null");
         ObjectHelper.verifyPositive(prefetch, "prefetch");
         return RxJavaPlugins.onAssembly(new FlowableConcatMapCompletable<T>(this, mapper, ErrorMode.IMMEDIATE, prefetch));
     }
@@ -7300,7 +7300,7 @@ public final Completable concatMapCompletableDelayError(Function<? super T, ? ex
     @SchedulerSupport(SchedulerSupport.NONE)
     @BackpressureSupport(BackpressureKind.FULL)
     public final Completable concatMapCompletableDelayError(Function<? super T, ? extends CompletableSource> mapper, boolean tillTheEnd, int prefetch) {
-        ObjectHelper.requireNonNull(mapper, "mapper is null");
+        Objects.requireNonNull(mapper, "mapper is null");
         ObjectHelper.verifyPositive(prefetch, "prefetch");
         return RxJavaPlugins.onAssembly(new FlowableConcatMapCompletable<T>(this, mapper, tillTheEnd ? ErrorMode.END : ErrorMode.BOUNDARY, prefetch));
     }
@@ -7374,7 +7374,7 @@ public final <R> Flowable<R> concatMapDelayError(Function<? super T, ? extends P
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <R> Flowable<R> concatMapDelayError(Function<? super T, ? extends Publisher<? extends R>> mapper,
             boolean tillTheEnd, int prefetch) {
-        ObjectHelper.requireNonNull(mapper, "mapper is null");
+        Objects.requireNonNull(mapper, "mapper is null");
         ObjectHelper.verifyPositive(prefetch, "prefetch");
         if (this instanceof ScalarSupplier) {
             @SuppressWarnings("unchecked")
@@ -7426,9 +7426,9 @@ public final <R> Flowable<R> concatMapDelayError(Function<? super T, ? extends P
     @SchedulerSupport(SchedulerSupport.CUSTOM)
     public final <R> Flowable<R> concatMapDelayError(Function<? super T, ? extends Publisher<? extends R>> mapper,
             boolean tillTheEnd, int prefetch, Scheduler scheduler) {
-        ObjectHelper.requireNonNull(mapper, "mapper is null");
+        Objects.requireNonNull(mapper, "mapper is null");
         ObjectHelper.verifyPositive(prefetch, "prefetch");
-        ObjectHelper.requireNonNull(scheduler, "scheduler is null");
+        Objects.requireNonNull(scheduler, "scheduler is null");
         return RxJavaPlugins.onAssembly(new FlowableConcatMapScheduler<T, R>(this, mapper, prefetch, tillTheEnd ? ErrorMode.END : ErrorMode.BOUNDARY, scheduler));
     }
 
@@ -7487,7 +7487,7 @@ public final <R> Flowable<R> concatMapEager(Function<? super T, ? extends Publis
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <R> Flowable<R> concatMapEager(Function<? super T, ? extends Publisher<? extends R>> mapper,
             int maxConcurrency, int prefetch) {
-        ObjectHelper.requireNonNull(mapper, "mapper is null");
+        Objects.requireNonNull(mapper, "mapper is null");
         ObjectHelper.verifyPositive(maxConcurrency, "maxConcurrency");
         ObjectHelper.verifyPositive(prefetch, "prefetch");
         return RxJavaPlugins.onAssembly(new FlowableConcatMapEager<T, R>(this, mapper, maxConcurrency, prefetch, ErrorMode.IMMEDIATE));
@@ -7557,7 +7557,7 @@ public final <R> Flowable<R> concatMapEagerDelayError(Function<? super T, ? exte
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <R> Flowable<R> concatMapEagerDelayError(Function<? super T, ? extends Publisher<? extends R>> mapper,
             boolean tillTheEnd, int maxConcurrency, int prefetch) {
-        ObjectHelper.requireNonNull(mapper, "mapper is null");
+        Objects.requireNonNull(mapper, "mapper is null");
         ObjectHelper.verifyPositive(maxConcurrency, "maxConcurrency");
         ObjectHelper.verifyPositive(prefetch, "prefetch");
         return RxJavaPlugins.onAssembly(new FlowableConcatMapEager<T, R>(this, mapper, maxConcurrency, prefetch, tillTheEnd ? ErrorMode.END : ErrorMode.BOUNDARY));
@@ -7621,7 +7621,7 @@ public final <U> Flowable<U> concatMapIterable(Function<? super T, ? extends Ite
     @BackpressureSupport(BackpressureKind.FULL)
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <U> Flowable<U> concatMapIterable(final Function<? super T, ? extends Iterable<? extends U>> mapper, int prefetch) {
-        ObjectHelper.requireNonNull(mapper, "mapper is null");
+        Objects.requireNonNull(mapper, "mapper is null");
         ObjectHelper.verifyPositive(prefetch, "prefetch");
         return RxJavaPlugins.onAssembly(new FlowableFlattenIterable<T, U>(this, mapper, prefetch));
     }
@@ -7690,7 +7690,7 @@ public final <R> Flowable<R> concatMapMaybe(Function<? super T, ? extends MaybeS
     @BackpressureSupport(BackpressureKind.FULL)
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <R> Flowable<R> concatMapMaybe(Function<? super T, ? extends MaybeSource<? extends R>> mapper, int prefetch) {
-        ObjectHelper.requireNonNull(mapper, "mapper is null");
+        Objects.requireNonNull(mapper, "mapper is null");
         ObjectHelper.verifyPositive(prefetch, "prefetch");
         return RxJavaPlugins.onAssembly(new FlowableConcatMapMaybe<T, R>(this, mapper, ErrorMode.IMMEDIATE, prefetch));
     }
@@ -7801,7 +7801,7 @@ public final <R> Flowable<R> concatMapMaybeDelayError(Function<? super T, ? exte
     @BackpressureSupport(BackpressureKind.FULL)
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <R> Flowable<R> concatMapMaybeDelayError(Function<? super T, ? extends MaybeSource<? extends R>> mapper, boolean tillTheEnd, int prefetch) {
-        ObjectHelper.requireNonNull(mapper, "mapper is null");
+        Objects.requireNonNull(mapper, "mapper is null");
         ObjectHelper.verifyPositive(prefetch, "prefetch");
         return RxJavaPlugins.onAssembly(new FlowableConcatMapMaybe<T, R>(this, mapper, tillTheEnd ? ErrorMode.END : ErrorMode.BOUNDARY, prefetch));
     }
@@ -7870,7 +7870,7 @@ public final <R> Flowable<R> concatMapSingle(Function<? super T, ? extends Singl
     @BackpressureSupport(BackpressureKind.FULL)
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <R> Flowable<R> concatMapSingle(Function<? super T, ? extends SingleSource<? extends R>> mapper, int prefetch) {
-        ObjectHelper.requireNonNull(mapper, "mapper is null");
+        Objects.requireNonNull(mapper, "mapper is null");
         ObjectHelper.verifyPositive(prefetch, "prefetch");
         return RxJavaPlugins.onAssembly(new FlowableConcatMapSingle<T, R>(this, mapper, ErrorMode.IMMEDIATE, prefetch));
     }
@@ -7981,7 +7981,7 @@ public final <R> Flowable<R> concatMapSingleDelayError(Function<? super T, ? ext
     @BackpressureSupport(BackpressureKind.FULL)
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <R> Flowable<R> concatMapSingleDelayError(Function<? super T, ? extends SingleSource<? extends R>> mapper, boolean tillTheEnd, int prefetch) {
-        ObjectHelper.requireNonNull(mapper, "mapper is null");
+        Objects.requireNonNull(mapper, "mapper is null");
         ObjectHelper.verifyPositive(prefetch, "prefetch");
         return RxJavaPlugins.onAssembly(new FlowableConcatMapSingle<T, R>(this, mapper, tillTheEnd ? ErrorMode.END : ErrorMode.BOUNDARY, prefetch));
     }
@@ -8011,7 +8011,7 @@ public final <R> Flowable<R> concatMapSingleDelayError(Function<? super T, ? ext
     @BackpressureSupport(BackpressureKind.FULL)
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Flowable<T> concatWith(Publisher<? extends T> other) {
-        ObjectHelper.requireNonNull(other, "other is null");
+        Objects.requireNonNull(other, "other is null");
         return concat(this, other);
     }
 
@@ -8036,7 +8036,7 @@ public final Flowable<T> concatWith(Publisher<? extends T> other) {
     @BackpressureSupport(BackpressureKind.FULL)
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Flowable<T> concatWith(@NonNull SingleSource<? extends T> other) {
-        ObjectHelper.requireNonNull(other, "other is null");
+        Objects.requireNonNull(other, "other is null");
         return RxJavaPlugins.onAssembly(new FlowableConcatWithSingle<T>(this, other));
     }
 
@@ -8061,7 +8061,7 @@ public final Flowable<T> concatWith(@NonNull SingleSource<? extends T> other) {
     @BackpressureSupport(BackpressureKind.FULL)
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Flowable<T> concatWith(@NonNull MaybeSource<? extends T> other) {
-        ObjectHelper.requireNonNull(other, "other is null");
+        Objects.requireNonNull(other, "other is null");
         return RxJavaPlugins.onAssembly(new FlowableConcatWithMaybe<T>(this, other));
     }
 
@@ -8088,7 +8088,7 @@ public final Flowable<T> concatWith(@NonNull MaybeSource<? extends T> other) {
     @BackpressureSupport(BackpressureKind.PASS_THROUGH)
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Flowable<T> concatWith(@NonNull CompletableSource other) {
-        ObjectHelper.requireNonNull(other, "other is null");
+        Objects.requireNonNull(other, "other is null");
         return RxJavaPlugins.onAssembly(new FlowableConcatWithCompletable<T>(this, other));
     }
 
@@ -8116,7 +8116,7 @@ public final Flowable<T> concatWith(@NonNull CompletableSource other) {
     @BackpressureSupport(BackpressureKind.UNBOUNDED_IN)
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Single<Boolean> contains(final Object item) {
-        ObjectHelper.requireNonNull(item, "item is null");
+        Objects.requireNonNull(item, "item is null");
         return any(Functions.equalsWith(item));
     }
 
@@ -8179,7 +8179,7 @@ public final Single<Long> count() {
     @BackpressureSupport(BackpressureKind.ERROR)
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <U> Flowable<T> debounce(Function<? super T, ? extends Publisher<U>> debounceIndicator) {
-        ObjectHelper.requireNonNull(debounceIndicator, "debounceIndicator is null");
+        Objects.requireNonNull(debounceIndicator, "debounceIndicator is null");
         return RxJavaPlugins.onAssembly(new FlowableDebounce<T, U>(this, debounceIndicator));
     }
 
@@ -8267,8 +8267,8 @@ public final Flowable<T> debounce(long timeout, TimeUnit unit) {
     @BackpressureSupport(BackpressureKind.ERROR)
     @SchedulerSupport(SchedulerSupport.CUSTOM)
     public final Flowable<T> debounce(long timeout, TimeUnit unit, Scheduler scheduler) {
-        ObjectHelper.requireNonNull(unit, "unit is null");
-        ObjectHelper.requireNonNull(scheduler, "scheduler is null");
+        Objects.requireNonNull(unit, "unit is null");
+        Objects.requireNonNull(scheduler, "scheduler is null");
         return RxJavaPlugins.onAssembly(new FlowableDebounceTimed<T>(this, timeout, unit, scheduler));
     }
 
@@ -8298,7 +8298,7 @@ public final Flowable<T> debounce(long timeout, TimeUnit unit, Scheduler schedul
     @BackpressureSupport(BackpressureKind.FULL)
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Flowable<T> defaultIfEmpty(T defaultItem) {
-        ObjectHelper.requireNonNull(defaultItem, "defaultItem is null");
+        Objects.requireNonNull(defaultItem, "defaultItem is null");
         return switchIfEmpty(just(defaultItem));
     }
 
@@ -8334,7 +8334,7 @@ public final Flowable<T> defaultIfEmpty(T defaultItem) {
     @BackpressureSupport(BackpressureKind.FULL)
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <U> Flowable<T> delay(final Function<? super T, ? extends Publisher<U>> itemDelayIndicator) {
-        ObjectHelper.requireNonNull(itemDelayIndicator, "itemDelayIndicator is null");
+        Objects.requireNonNull(itemDelayIndicator, "itemDelayIndicator is null");
         return flatMap(FlowableInternalHelper.itemDelay(itemDelayIndicator));
     }
 
@@ -8450,8 +8450,8 @@ public final Flowable<T> delay(long delay, TimeUnit unit, Scheduler scheduler) {
     @BackpressureSupport(BackpressureKind.FULL)
     @SchedulerSupport(SchedulerSupport.CUSTOM)
     public final Flowable<T> delay(long delay, TimeUnit unit, Scheduler scheduler, boolean delayError) {
-        ObjectHelper.requireNonNull(unit, "unit is null");
-        ObjectHelper.requireNonNull(scheduler, "scheduler is null");
+        Objects.requireNonNull(unit, "unit is null");
+        Objects.requireNonNull(scheduler, "scheduler is null");
 
         return RxJavaPlugins.onAssembly(new FlowableDelay<T>(this, Math.max(0L, delay), unit, scheduler, delayError));
     }
@@ -8519,7 +8519,7 @@ public final <U, V> Flowable<T> delay(Publisher<U> subscriptionIndicator,
     @BackpressureSupport(BackpressureKind.FULL)
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <U> Flowable<T> delaySubscription(Publisher<U> subscriptionIndicator) {
-        ObjectHelper.requireNonNull(subscriptionIndicator, "subscriptionIndicator is null");
+        Objects.requireNonNull(subscriptionIndicator, "subscriptionIndicator is null");
         return RxJavaPlugins.onAssembly(new FlowableDelaySubscriptionOther<T, U>(this, subscriptionIndicator));
     }
 
@@ -8632,7 +8632,7 @@ public final Flowable<T> delaySubscription(long delay, TimeUnit unit, Scheduler
     @SchedulerSupport(SchedulerSupport.NONE)
     @BackpressureSupport(BackpressureKind.PASS_THROUGH)
     public final <R> Flowable<R> dematerialize(Function<? super T, Notification<R>> selector) {
-        ObjectHelper.requireNonNull(selector, "selector is null");
+        Objects.requireNonNull(selector, "selector is null");
         return RxJavaPlugins.onAssembly(new FlowableDematerialize<T, R>(this, selector));
     }
 
@@ -8752,8 +8752,8 @@ public final <K> Flowable<T> distinct(Function<? super T, K> keySelector) {
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <K> Flowable<T> distinct(Function<? super T, K> keySelector,
             Supplier<? extends Collection<? super K>> collectionSupplier) {
-        ObjectHelper.requireNonNull(keySelector, "keySelector is null");
-        ObjectHelper.requireNonNull(collectionSupplier, "collectionSupplier is null");
+        Objects.requireNonNull(keySelector, "keySelector is null");
+        Objects.requireNonNull(collectionSupplier, "collectionSupplier is null");
         return RxJavaPlugins.onAssembly(new FlowableDistinct<T, K>(this, keySelector, collectionSupplier));
     }
 
@@ -8841,7 +8841,7 @@ public final Flowable<T> distinctUntilChanged() {
     @BackpressureSupport(BackpressureKind.FULL)
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <K> Flowable<T> distinctUntilChanged(Function<? super T, K> keySelector) {
-        ObjectHelper.requireNonNull(keySelector, "keySelector is null");
+        Objects.requireNonNull(keySelector, "keySelector is null");
         return RxJavaPlugins.onAssembly(new FlowableDistinctUntilChanged<T, K>(this, keySelector, ObjectHelper.equalsPredicate()));
     }
 
@@ -8879,7 +8879,7 @@ public final <K> Flowable<T> distinctUntilChanged(Function<? super T, K> keySele
     @BackpressureSupport(BackpressureKind.FULL)
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Flowable<T> distinctUntilChanged(BiPredicate<? super T, ? super T> comparer) {
-        ObjectHelper.requireNonNull(comparer, "comparer is null");
+        Objects.requireNonNull(comparer, "comparer is null");
         return RxJavaPlugins.onAssembly(new FlowableDistinctUntilChanged<T, T>(this, Functions.<T>identity(), comparer));
     }
 
@@ -8909,7 +8909,7 @@ public final Flowable<T> distinctUntilChanged(BiPredicate<? super T, ? super T>
     @BackpressureSupport(BackpressureKind.PASS_THROUGH)
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Flowable<T> doFinally(Action onFinally) {
-        ObjectHelper.requireNonNull(onFinally, "onFinally is null");
+        Objects.requireNonNull(onFinally, "onFinally is null");
         return RxJavaPlugins.onAssembly(new FlowableDoFinally<T>(this, onFinally));
     }
 
@@ -8936,7 +8936,7 @@ public final Flowable<T> doFinally(Action onFinally) {
     @BackpressureSupport(BackpressureKind.PASS_THROUGH)
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Flowable<T> doAfterNext(Consumer<? super T> onAfterNext) {
-        ObjectHelper.requireNonNull(onAfterNext, "onAfterNext is null");
+        Objects.requireNonNull(onAfterNext, "onAfterNext is null");
         return RxJavaPlugins.onAssembly(new FlowableDoAfterNext<T>(this, onAfterNext));
     }
 
@@ -9047,10 +9047,10 @@ public final Flowable<T> doOnComplete(Action onComplete) {
     @SchedulerSupport(SchedulerSupport.NONE)
     private Flowable<T> doOnEach(Consumer<? super T> onNext, Consumer<? super Throwable> onError,
             Action onComplete, Action onAfterTerminate) {
-        ObjectHelper.requireNonNull(onNext, "onNext is null");
-        ObjectHelper.requireNonNull(onError, "onError is null");
-        ObjectHelper.requireNonNull(onComplete, "onComplete is null");
-        ObjectHelper.requireNonNull(onAfterTerminate, "onAfterTerminate is null");
+        Objects.requireNonNull(onNext, "onNext is null");
+        Objects.requireNonNull(onError, "onError is null");
+        Objects.requireNonNull(onComplete, "onComplete is null");
+        Objects.requireNonNull(onAfterTerminate, "onAfterTerminate is null");
         return RxJavaPlugins.onAssembly(new FlowableDoOnEach<T>(this, onNext, onError, onComplete, onAfterTerminate));
     }
 
@@ -9076,7 +9076,7 @@ private Flowable<T> doOnEach(Consumer<? super T> onNext, Consumer<? super Throwa
     @BackpressureSupport(BackpressureKind.PASS_THROUGH)
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Flowable<T> doOnEach(final Consumer<? super Notification<T>> onNotification) {
-        ObjectHelper.requireNonNull(onNotification, "onNotification is null");
+        Objects.requireNonNull(onNotification, "onNotification is null");
         return doOnEach(
                 Functions.notificationOnNext(onNotification),
                 Functions.notificationOnError(onNotification),
@@ -9113,7 +9113,7 @@ public final Flowable<T> doOnEach(final Consumer<? super Notification<T>> onNoti
     @BackpressureSupport(BackpressureKind.PASS_THROUGH)
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Flowable<T> doOnEach(final Subscriber<? super T> subscriber) {
-        ObjectHelper.requireNonNull(subscriber, "subscriber is null");
+        Objects.requireNonNull(subscriber, "subscriber is null");
         return doOnEach(
                 FlowableInternalHelper.subscriberOnNext(subscriber),
                 FlowableInternalHelper.subscriberOnError(subscriber),
@@ -9177,9 +9177,9 @@ public final Flowable<T> doOnError(Consumer<? super Throwable> onError) {
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Flowable<T> doOnLifecycle(final Consumer<? super Subscription> onSubscribe,
             final LongConsumer onRequest, final Action onCancel) {
-        ObjectHelper.requireNonNull(onSubscribe, "onSubscribe is null");
-        ObjectHelper.requireNonNull(onRequest, "onRequest is null");
-        ObjectHelper.requireNonNull(onCancel, "onCancel is null");
+        Objects.requireNonNull(onSubscribe, "onSubscribe is null");
+        Objects.requireNonNull(onRequest, "onRequest is null");
+        Objects.requireNonNull(onCancel, "onCancel is null");
         return RxJavaPlugins.onAssembly(new FlowableDoOnLifecycle<T>(this, onSubscribe, onRequest, onCancel));
     }
 
@@ -9352,7 +9352,7 @@ public final Single<T> elementAt(long index, T defaultItem) {
         if (index < 0) {
             throw new IndexOutOfBoundsException("index >= 0 required but it was " + index);
         }
-        ObjectHelper.requireNonNull(defaultItem, "defaultItem is null");
+        Objects.requireNonNull(defaultItem, "defaultItem is null");
         return RxJavaPlugins.onAssembly(new FlowableElementAtSingle<T>(this, index, defaultItem));
     }
 
@@ -9410,7 +9410,7 @@ public final Single<T> elementAtOrError(long index) {
     @BackpressureSupport(BackpressureKind.PASS_THROUGH)
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Flowable<T> filter(Predicate<? super T> predicate) {
-        ObjectHelper.requireNonNull(predicate, "predicate is null");
+        Objects.requireNonNull(predicate, "predicate is null");
         return RxJavaPlugins.onAssembly(new FlowableFilter<T>(this, predicate));
     }
 
@@ -9665,7 +9665,7 @@ public final <R> Flowable<R> flatMap(Function<? super T, ? extends Publisher<? e
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <R> Flowable<R> flatMap(Function<? super T, ? extends Publisher<? extends R>> mapper,
             boolean delayErrors, int maxConcurrency, int bufferSize) {
-        ObjectHelper.requireNonNull(mapper, "mapper is null");
+        Objects.requireNonNull(mapper, "mapper is null");
         ObjectHelper.verifyPositive(maxConcurrency, "maxConcurrency");
         ObjectHelper.verifyPositive(bufferSize, "bufferSize");
         if (this instanceof ScalarSupplier) {
@@ -9716,9 +9716,9 @@ public final <R> Flowable<R> flatMap(
             Function<? super T, ? extends Publisher<? extends R>> onNextMapper,
             Function<? super Throwable, ? extends Publisher<? extends R>> onErrorMapper,
             Supplier<? extends Publisher<? extends R>> onCompleteSupplier) {
-        ObjectHelper.requireNonNull(onNextMapper, "onNextMapper is null");
-        ObjectHelper.requireNonNull(onErrorMapper, "onErrorMapper is null");
-        ObjectHelper.requireNonNull(onCompleteSupplier, "onCompleteSupplier is null");
+        Objects.requireNonNull(onNextMapper, "onNextMapper is null");
+        Objects.requireNonNull(onErrorMapper, "onErrorMapper is null");
+        Objects.requireNonNull(onCompleteSupplier, "onCompleteSupplier is null");
         return merge(new FlowableMapNotification<T, Publisher<? extends R>>(this, onNextMapper, onErrorMapper, onCompleteSupplier));
     }
 
@@ -9764,9 +9764,9 @@ public final <R> Flowable<R> flatMap(
             Function<Throwable, ? extends Publisher<? extends R>> onErrorMapper,
             Supplier<? extends Publisher<? extends R>> onCompleteSupplier,
             int maxConcurrency) {
-        ObjectHelper.requireNonNull(onNextMapper, "onNextMapper is null");
-        ObjectHelper.requireNonNull(onErrorMapper, "onErrorMapper is null");
-        ObjectHelper.requireNonNull(onCompleteSupplier, "onCompleteSupplier is null");
+        Objects.requireNonNull(onNextMapper, "onNextMapper is null");
+        Objects.requireNonNull(onErrorMapper, "onErrorMapper is null");
+        Objects.requireNonNull(onCompleteSupplier, "onCompleteSupplier is null");
         return merge(new FlowableMapNotification<T, Publisher<? extends R>>(
                 this, onNextMapper, onErrorMapper, onCompleteSupplier), maxConcurrency);
     }
@@ -9932,8 +9932,8 @@ public final <U, R> Flowable<R> flatMap(Function<? super T, ? extends Publisher<
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <U, R> Flowable<R> flatMap(final Function<? super T, ? extends Publisher<? extends U>> mapper,
             final BiFunction<? super T, ? super U, ? extends R> combiner, boolean delayErrors, int maxConcurrency, int bufferSize) {
-        ObjectHelper.requireNonNull(mapper, "mapper is null");
-        ObjectHelper.requireNonNull(combiner, "combiner is null");
+        Objects.requireNonNull(mapper, "mapper is null");
+        Objects.requireNonNull(combiner, "combiner is null");
         ObjectHelper.verifyPositive(maxConcurrency, "maxConcurrency");
         ObjectHelper.verifyPositive(bufferSize, "bufferSize");
         return flatMap(FlowableInternalHelper.flatMapWithCombiner(mapper, combiner), delayErrors, maxConcurrency, bufferSize);
@@ -10020,7 +10020,7 @@ public final Completable flatMapCompletable(Function<? super T, ? extends Comple
     @BackpressureSupport(BackpressureKind.UNBOUNDED_IN)
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Completable flatMapCompletable(Function<? super T, ? extends CompletableSource> mapper, boolean delayErrors, int maxConcurrency) {
-        ObjectHelper.requireNonNull(mapper, "mapper is null");
+        Objects.requireNonNull(mapper, "mapper is null");
         ObjectHelper.verifyPositive(maxConcurrency, "maxConcurrency");
         return RxJavaPlugins.onAssembly(new FlowableFlatMapCompletableCompletable<T>(this, mapper, delayErrors, maxConcurrency));
     }
@@ -10085,7 +10085,7 @@ public final <U> Flowable<U> flatMapIterable(final Function<? super T, ? extends
     @BackpressureSupport(BackpressureKind.FULL)
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <U> Flowable<U> flatMapIterable(final Function<? super T, ? extends Iterable<? extends U>> mapper, int bufferSize) {
-        ObjectHelper.requireNonNull(mapper, "mapper is null");
+        Objects.requireNonNull(mapper, "mapper is null");
         ObjectHelper.verifyPositive(bufferSize, "bufferSize");
         return RxJavaPlugins.onAssembly(new FlowableFlattenIterable<T, U>(this, mapper, bufferSize));
     }
@@ -10123,8 +10123,8 @@ public final <U> Flowable<U> flatMapIterable(final Function<? super T, ? extends
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <U, V> Flowable<V> flatMapIterable(final Function<? super T, ? extends Iterable<? extends U>> mapper,
             final BiFunction<? super T, ? super U, ? extends V> resultSelector) {
-        ObjectHelper.requireNonNull(mapper, "mapper is null");
-        ObjectHelper.requireNonNull(resultSelector, "resultSelector is null");
+        Objects.requireNonNull(mapper, "mapper is null");
+        Objects.requireNonNull(resultSelector, "resultSelector is null");
         return flatMap(FlowableInternalHelper.flatMapIntoIterable(mapper), resultSelector, false, bufferSize(), bufferSize());
     }
 
@@ -10166,8 +10166,8 @@ public final <U, V> Flowable<V> flatMapIterable(final Function<? super T, ? exte
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <U, V> Flowable<V> flatMapIterable(final Function<? super T, ? extends Iterable<? extends U>> mapper,
             final BiFunction<? super T, ? super U, ? extends V> resultSelector, int prefetch) {
-        ObjectHelper.requireNonNull(mapper, "mapper is null");
-        ObjectHelper.requireNonNull(resultSelector, "resultSelector is null");
+        Objects.requireNonNull(mapper, "mapper is null");
+        Objects.requireNonNull(resultSelector, "resultSelector is null");
         return flatMap(FlowableInternalHelper.flatMapIntoIterable(mapper), resultSelector, false, bufferSize(), prefetch);
     }
 
@@ -10215,7 +10215,7 @@ public final <R> Flowable<R> flatMapMaybe(Function<? super T, ? extends MaybeSou
     @BackpressureSupport(BackpressureKind.UNBOUNDED_IN)
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <R> Flowable<R> flatMapMaybe(Function<? super T, ? extends MaybeSource<? extends R>> mapper, boolean delayErrors, int maxConcurrency) {
-        ObjectHelper.requireNonNull(mapper, "mapper is null");
+        Objects.requireNonNull(mapper, "mapper is null");
         ObjectHelper.verifyPositive(maxConcurrency, "maxConcurrency");
         return RxJavaPlugins.onAssembly(new FlowableFlatMapMaybe<T, R>(this, mapper, delayErrors, maxConcurrency));
     }
@@ -10264,7 +10264,7 @@ public final <R> Flowable<R> flatMapSingle(Function<? super T, ? extends SingleS
     @BackpressureSupport(BackpressureKind.UNBOUNDED_IN)
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <R> Flowable<R> flatMapSingle(Function<? super T, ? extends SingleSource<? extends R>> mapper, boolean delayErrors, int maxConcurrency) {
-        ObjectHelper.requireNonNull(mapper, "mapper is null");
+        Objects.requireNonNull(mapper, "mapper is null");
         ObjectHelper.verifyPositive(maxConcurrency, "maxConcurrency");
         return RxJavaPlugins.onAssembly(new FlowableFlatMapSingle<T, R>(this, mapper, delayErrors, maxConcurrency));
     }
@@ -10386,9 +10386,9 @@ public final Disposable forEachWhile(Predicate<? super T> onNext, Consumer<? sup
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Disposable forEachWhile(final Predicate<? super T> onNext, final Consumer<? super Throwable> onError,
             final Action onComplete) {
-        ObjectHelper.requireNonNull(onNext, "onNext is null");
-        ObjectHelper.requireNonNull(onError, "onError is null");
-        ObjectHelper.requireNonNull(onComplete, "onComplete is null");
+        Objects.requireNonNull(onNext, "onNext is null");
+        Objects.requireNonNull(onError, "onError is null");
+        Objects.requireNonNull(onComplete, "onComplete is null");
 
         ForEachWhileSubscriber<T> s = new ForEachWhileSubscriber<T>(onNext, onError, onComplete);
         subscribe(s);
@@ -10706,8 +10706,8 @@ public final <K, V> Flowable<GroupedFlowable<K, V>> groupBy(Function<? super T,
     public final <K, V> Flowable<GroupedFlowable<K, V>> groupBy(Function<? super T, ? extends K> keySelector,
             Function<? super T, ? extends V> valueSelector,
             boolean delayError, int bufferSize) {
-        ObjectHelper.requireNonNull(keySelector, "keySelector is null");
-        ObjectHelper.requireNonNull(valueSelector, "valueSelector is null");
+        Objects.requireNonNull(keySelector, "keySelector is null");
+        Objects.requireNonNull(valueSelector, "valueSelector is null");
         ObjectHelper.verifyPositive(bufferSize, "bufferSize");
 
         return RxJavaPlugins.onAssembly(new FlowableGroupBy<T, K, V>(this, keySelector, valueSelector, bufferSize, delayError, null));
@@ -10828,10 +10828,10 @@ public final <K, V> Flowable<GroupedFlowable<K, V>> groupBy(Function<? super T,
             Function<? super T, ? extends V> valueSelector,
             boolean delayError, int bufferSize,
             Function<? super Consumer<Object>, ? extends Map<K, Object>> evictingMapFactory) {
-        ObjectHelper.requireNonNull(keySelector, "keySelector is null");
-        ObjectHelper.requireNonNull(valueSelector, "valueSelector is null");
+        Objects.requireNonNull(keySelector, "keySelector is null");
+        Objects.requireNonNull(valueSelector, "valueSelector is null");
         ObjectHelper.verifyPositive(bufferSize, "bufferSize");
-        ObjectHelper.requireNonNull(evictingMapFactory, "evictingMapFactory is null");
+        Objects.requireNonNull(evictingMapFactory, "evictingMapFactory is null");
 
         return RxJavaPlugins.onAssembly(new FlowableGroupBy<T, K, V>(this, keySelector, valueSelector, bufferSize, delayError, evictingMapFactory));
     }
@@ -10879,10 +10879,10 @@ public final <TRight, TLeftEnd, TRightEnd, R> Flowable<R> groupJoin(
             Function<? super T, ? extends Publisher<TLeftEnd>> leftEnd,
             Function<? super TRight, ? extends Publisher<TRightEnd>> rightEnd,
             BiFunction<? super T, ? super Flowable<TRight>, ? extends R> resultSelector) {
-        ObjectHelper.requireNonNull(other, "other is null");
-        ObjectHelper.requireNonNull(leftEnd, "leftEnd is null");
-        ObjectHelper.requireNonNull(rightEnd, "rightEnd is null");
-        ObjectHelper.requireNonNull(resultSelector, "resultSelector is null");
+        Objects.requireNonNull(other, "other is null");
+        Objects.requireNonNull(leftEnd, "leftEnd is null");
+        Objects.requireNonNull(rightEnd, "rightEnd is null");
+        Objects.requireNonNull(resultSelector, "resultSelector is null");
         return RxJavaPlugins.onAssembly(new FlowableGroupJoin<T, TRight, TLeftEnd, TRightEnd, R>(
                 this, other, leftEnd, rightEnd, resultSelector));
     }
@@ -11001,10 +11001,10 @@ public final <TRight, TLeftEnd, TRightEnd, R> Flowable<R> join(
             Function<? super T, ? extends Publisher<TLeftEnd>> leftEnd,
             Function<? super TRight, ? extends Publisher<TRightEnd>> rightEnd,
             BiFunction<? super T, ? super TRight, ? extends R> resultSelector) {
-        ObjectHelper.requireNonNull(other, "other is null");
-        ObjectHelper.requireNonNull(leftEnd, "leftEnd is null");
-        ObjectHelper.requireNonNull(rightEnd, "rightEnd is null");
-        ObjectHelper.requireNonNull(resultSelector, "resultSelector is null");
+        Objects.requireNonNull(other, "other is null");
+        Objects.requireNonNull(leftEnd, "leftEnd is null");
+        Objects.requireNonNull(rightEnd, "rightEnd is null");
+        Objects.requireNonNull(resultSelector, "resultSelector is null");
         return RxJavaPlugins.onAssembly(new FlowableJoin<T, TRight, TLeftEnd, TRightEnd, R>(
                 this, other, leftEnd, rightEnd, resultSelector));
     }
@@ -11055,7 +11055,7 @@ public final Maybe<T> lastElement() {
     @BackpressureSupport(BackpressureKind.UNBOUNDED_IN)
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Single<T> last(T defaultItem) {
-        ObjectHelper.requireNonNull(defaultItem, "defaultItem");
+        Objects.requireNonNull(defaultItem, "defaultItem");
         return RxJavaPlugins.onAssembly(new FlowableLastSingle<T>(this, defaultItem));
     }
 
@@ -11233,7 +11233,7 @@ public final Single<T> lastOrError() {
     @BackpressureSupport(BackpressureKind.SPECIAL)
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <R> Flowable<R> lift(FlowableOperator<? extends R, ? super T> lifter) {
-        ObjectHelper.requireNonNull(lifter, "lifter is null");
+        Objects.requireNonNull(lifter, "lifter is null");
         return RxJavaPlugins.onAssembly(new FlowableLift<R, T>(this, lifter));
     }
 
@@ -11262,7 +11262,7 @@ public final <R> Flowable<R> lift(FlowableOperator<? extends R, ? super T> lifte
     @BackpressureSupport(BackpressureKind.PASS_THROUGH)
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <R> Flowable<R> map(Function<? super T, ? extends R> mapper) {
-        ObjectHelper.requireNonNull(mapper, "mapper is null");
+        Objects.requireNonNull(mapper, "mapper is null");
         return RxJavaPlugins.onAssembly(new FlowableMap<T, R>(this, mapper));
     }
 
@@ -11316,7 +11316,7 @@ public final Flowable<Notification<T>> materialize() {
     @BackpressureSupport(BackpressureKind.FULL)
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Flowable<T> mergeWith(Publisher<? extends T> other) {
-        ObjectHelper.requireNonNull(other, "other is null");
+        Objects.requireNonNull(other, "other is null");
         return merge(this, other);
     }
 
@@ -11344,7 +11344,7 @@ public final Flowable<T> mergeWith(Publisher<? extends T> other) {
     @BackpressureSupport(BackpressureKind.FULL)
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Flowable<T> mergeWith(@NonNull SingleSource<? extends T> other) {
-        ObjectHelper.requireNonNull(other, "other is null");
+        Objects.requireNonNull(other, "other is null");
         return RxJavaPlugins.onAssembly(new FlowableMergeWithSingle<T>(this, other));
     }
 
@@ -11373,7 +11373,7 @@ public final Flowable<T> mergeWith(@NonNull SingleSource<? extends T> other) {
     @BackpressureSupport(BackpressureKind.FULL)
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Flowable<T> mergeWith(@NonNull MaybeSource<? extends T> other) {
-        ObjectHelper.requireNonNull(other, "other is null");
+        Objects.requireNonNull(other, "other is null");
         return RxJavaPlugins.onAssembly(new FlowableMergeWithMaybe<T>(this, other));
     }
 
@@ -11399,7 +11399,7 @@ public final Flowable<T> mergeWith(@NonNull MaybeSource<? extends T> other) {
     @BackpressureSupport(BackpressureKind.PASS_THROUGH)
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Flowable<T> mergeWith(@NonNull CompletableSource other) {
-        ObjectHelper.requireNonNull(other, "other is null");
+        Objects.requireNonNull(other, "other is null");
         return RxJavaPlugins.onAssembly(new FlowableMergeWithCompletable<T>(this, other));
     }
 
@@ -11554,7 +11554,7 @@ public final Flowable<T> observeOn(Scheduler scheduler, boolean delayError) {
     @BackpressureSupport(BackpressureKind.FULL)
     @SchedulerSupport(SchedulerSupport.CUSTOM)
     public final Flowable<T> observeOn(Scheduler scheduler, boolean delayError, int bufferSize) {
-        ObjectHelper.requireNonNull(scheduler, "scheduler is null");
+        Objects.requireNonNull(scheduler, "scheduler is null");
         ObjectHelper.verifyPositive(bufferSize, "bufferSize");
         return RxJavaPlugins.onAssembly(new FlowableObserveOn<T>(this, scheduler, delayError, bufferSize));
     }
@@ -11582,7 +11582,7 @@ public final Flowable<T> observeOn(Scheduler scheduler, boolean delayError, int
     @BackpressureSupport(BackpressureKind.PASS_THROUGH)
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <U> Flowable<U> ofType(final Class<U> clazz) {
-        ObjectHelper.requireNonNull(clazz, "clazz is null");
+        Objects.requireNonNull(clazz, "clazz is null");
         return filter(Functions.isInstanceOf(clazz)).cast(clazz);
     }
 
@@ -11760,7 +11760,7 @@ public final Flowable<T> onBackpressureBuffer(int capacity, boolean delayError,
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Flowable<T> onBackpressureBuffer(int capacity, boolean delayError, boolean unbounded,
             Action onOverflow) {
-        ObjectHelper.requireNonNull(onOverflow, "onOverflow is null");
+        Objects.requireNonNull(onOverflow, "onOverflow is null");
         ObjectHelper.verifyPositive(capacity, "capacity");
         return RxJavaPlugins.onAssembly(new FlowableOnBackpressureBuffer<T>(this, capacity, unbounded, delayError, onOverflow));
     }
@@ -11831,7 +11831,7 @@ public final Flowable<T> onBackpressureBuffer(int capacity, Action onOverflow) {
     @BackpressureSupport(BackpressureKind.SPECIAL)
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Flowable<T> onBackpressureBuffer(long capacity, Action onOverflow, BackpressureOverflowStrategy overflowStrategy) {
-        ObjectHelper.requireNonNull(overflowStrategy, "overflowStrategy is null");
+        Objects.requireNonNull(overflowStrategy, "overflowStrategy is null");
         ObjectHelper.verifyPositive(capacity, "capacity");
         return RxJavaPlugins.onAssembly(new FlowableOnBackpressureBufferStrategy<T>(this, capacity, onOverflow, overflowStrategy));
     }
@@ -11888,7 +11888,7 @@ public final Flowable<T> onBackpressureDrop() {
     @BackpressureSupport(BackpressureKind.UNBOUNDED_IN)
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Flowable<T> onBackpressureDrop(Consumer<? super T> onDrop) {
-        ObjectHelper.requireNonNull(onDrop, "onDrop is null");
+        Objects.requireNonNull(onDrop, "onDrop is null");
         return RxJavaPlugins.onAssembly(new FlowableOnBackpressureDrop<T>(this, onDrop));
     }
 
@@ -11964,7 +11964,7 @@ public final Flowable<T> onBackpressureLatest() {
     @BackpressureSupport(BackpressureKind.FULL)
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Flowable<T> onErrorResumeNext(Function<? super Throwable, ? extends Publisher<? extends T>> resumeFunction) {
-        ObjectHelper.requireNonNull(resumeFunction, "resumeFunction is null");
+        Objects.requireNonNull(resumeFunction, "resumeFunction is null");
         return RxJavaPlugins.onAssembly(new FlowableOnErrorNext<T>(this, resumeFunction));
     }
 
@@ -12008,7 +12008,7 @@ public final Flowable<T> onErrorResumeNext(Function<? super Throwable, ? extends
     @BackpressureSupport(BackpressureKind.FULL)
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Flowable<T> onErrorResumeWith(final Publisher<? extends T> next) {
-        ObjectHelper.requireNonNull(next, "next is null");
+        Objects.requireNonNull(next, "next is null");
         return onErrorResumeNext(Functions.justFunction(next));
     }
 
@@ -12048,7 +12048,7 @@ public final Flowable<T> onErrorResumeWith(final Publisher<? extends T> next) {
     @BackpressureSupport(BackpressureKind.FULL)
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Flowable<T> onErrorReturn(Function<? super Throwable, ? extends T> valueSupplier) {
-        ObjectHelper.requireNonNull(valueSupplier, "valueSupplier is null");
+        Objects.requireNonNull(valueSupplier, "valueSupplier is null");
         return RxJavaPlugins.onAssembly(new FlowableOnErrorReturn<T>(this, valueSupplier));
     }
 
@@ -12088,7 +12088,7 @@ public final Flowable<T> onErrorReturn(Function<? super Throwable, ? extends T>
     @BackpressureSupport(BackpressureKind.FULL)
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Flowable<T> onErrorReturnItem(final T item) {
-        ObjectHelper.requireNonNull(item, "item is null");
+        Objects.requireNonNull(item, "item is null");
         return onErrorReturn(Functions.justFunction(item));
     }
 
@@ -12297,7 +12297,7 @@ public final <R> Flowable<R> publish(Function<? super Flowable<T>, ? extends Pub
     @BackpressureSupport(BackpressureKind.FULL)
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <R> Flowable<R> publish(Function<? super Flowable<T>, ? extends Publisher<? extends R>> selector, int prefetch) {
-        ObjectHelper.requireNonNull(selector, "selector is null");
+        Objects.requireNonNull(selector, "selector is null");
         ObjectHelper.verifyPositive(prefetch, "prefetch");
         return RxJavaPlugins.onAssembly(new FlowablePublishMulticast<T, R>(this, selector, prefetch, false));
     }
@@ -12392,7 +12392,7 @@ public final Flowable<T> rebatchRequests(int n) {
     @BackpressureSupport(BackpressureKind.UNBOUNDED_IN)
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Maybe<T> reduce(BiFunction<T, T, T> reducer) {
-        ObjectHelper.requireNonNull(reducer, "reducer is null");
+        Objects.requireNonNull(reducer, "reducer is null");
         return RxJavaPlugins.onAssembly(new FlowableReduceMaybe<T>(this, reducer));
     }
 
@@ -12454,8 +12454,8 @@ public final Maybe<T> reduce(BiFunction<T, T, T> reducer) {
     @BackpressureSupport(BackpressureKind.UNBOUNDED_IN)
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <R> Single<R> reduce(R seed, BiFunction<R, ? super T, R> reducer) {
-        ObjectHelper.requireNonNull(seed, "seed is null");
-        ObjectHelper.requireNonNull(reducer, "reducer is null");
+        Objects.requireNonNull(seed, "seed is null");
+        Objects.requireNonNull(reducer, "reducer is null");
         return RxJavaPlugins.onAssembly(new FlowableReduceSeedSingle<T, R>(this, seed, reducer));
     }
 
@@ -12499,8 +12499,8 @@ public final <R> Single<R> reduce(R seed, BiFunction<R, ? super T, R> reducer) {
     @BackpressureSupport(BackpressureKind.UNBOUNDED_IN)
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <R> Single<R> reduceWith(Supplier<R> seedSupplier, BiFunction<R, ? super T, R> reducer) {
-        ObjectHelper.requireNonNull(seedSupplier, "seedSupplier is null");
-        ObjectHelper.requireNonNull(reducer, "reducer is null");
+        Objects.requireNonNull(seedSupplier, "seedSupplier is null");
+        Objects.requireNonNull(reducer, "reducer is null");
         return RxJavaPlugins.onAssembly(new FlowableReduceWithSingle<T, R>(this, seedSupplier, reducer));
     }
 
@@ -12587,7 +12587,7 @@ public final Flowable<T> repeat(long times) {
     @BackpressureSupport(BackpressureKind.FULL)
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Flowable<T> repeatUntil(BooleanSupplier stop) {
-        ObjectHelper.requireNonNull(stop, "stop is null");
+        Objects.requireNonNull(stop, "stop is null");
         return RxJavaPlugins.onAssembly(new FlowableRepeatUntil<T>(this, stop));
     }
 
@@ -12618,7 +12618,7 @@ public final Flowable<T> repeatUntil(BooleanSupplier stop) {
     @BackpressureSupport(BackpressureKind.FULL)
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Flowable<T> repeatWhen(final Function<? super Flowable<Object>, ? extends Publisher<?>> handler) {
-        ObjectHelper.requireNonNull(handler, "handler is null");
+        Objects.requireNonNull(handler, "handler is null");
         return RxJavaPlugins.onAssembly(new FlowableRepeatWhen<T>(this, handler));
     }
 
@@ -12677,7 +12677,7 @@ public final ConnectableFlowable<T> replay() {
     @BackpressureSupport(BackpressureKind.FULL)
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <R> Flowable<R> replay(Function<? super Flowable<T>, ? extends Publisher<R>> selector) {
-        ObjectHelper.requireNonNull(selector, "selector is null");
+        Objects.requireNonNull(selector, "selector is null");
         return FlowableReplay.multicastSelector(FlowableInternalHelper.replaySupplier(this), selector);
     }
 
@@ -12717,7 +12717,7 @@ public final <R> Flowable<R> replay(Function<? super Flowable<T>, ? extends Publ
     @BackpressureSupport(BackpressureKind.FULL)
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <R> Flowable<R> replay(Function<? super Flowable<T>, ? extends Publisher<R>> selector, final int bufferSize) {
-        ObjectHelper.requireNonNull(selector, "selector is null");
+        Objects.requireNonNull(selector, "selector is null");
         ObjectHelper.verifyPositive(bufferSize, "bufferSize");
         return FlowableReplay.multicastSelector(FlowableInternalHelper.replaySupplier(this, bufferSize, false), selector);
     }
@@ -12760,7 +12760,7 @@ public final <R> Flowable<R> replay(Function<? super Flowable<T>, ? extends Publ
     @BackpressureSupport(BackpressureKind.FULL)
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <R> Flowable<R> replay(Function<? super Flowable<T>, ? extends Publisher<R>> selector, final int bufferSize, boolean eagerTruncate) {
-        ObjectHelper.requireNonNull(selector, "selector is null");
+        Objects.requireNonNull(selector, "selector is null");
         ObjectHelper.verifyPositive(bufferSize, "bufferSize");
         return FlowableReplay.multicastSelector(FlowableInternalHelper.replaySupplier(this, bufferSize, eagerTruncate), selector);
     }
@@ -12852,10 +12852,10 @@ public final <R> Flowable<R> replay(Function<? super Flowable<T>, ? extends Publ
     @BackpressureSupport(BackpressureKind.FULL)
     @SchedulerSupport(SchedulerSupport.CUSTOM)
     public final <R> Flowable<R> replay(Function<? super Flowable<T>, ? extends Publisher<R>> selector, final int bufferSize, final long time, final TimeUnit unit, final Scheduler scheduler) {
-        ObjectHelper.requireNonNull(selector, "selector is null");
-        ObjectHelper.requireNonNull(unit, "unit is null");
+        Objects.requireNonNull(selector, "selector is null");
+        Objects.requireNonNull(unit, "unit is null");
         ObjectHelper.verifyPositive(bufferSize, "bufferSize");
-        ObjectHelper.requireNonNull(scheduler, "scheduler is null");
+        Objects.requireNonNull(scheduler, "scheduler is null");
         return FlowableReplay.multicastSelector(
                 FlowableInternalHelper.replaySupplier(this, bufferSize, time, unit, scheduler, false), selector);
     }
@@ -12907,10 +12907,10 @@ public final <R> Flowable<R> replay(Function<? super Flowable<T>, ? extends Publ
     @BackpressureSupport(BackpressureKind.FULL)
     @SchedulerSupport(SchedulerSupport.CUSTOM)
     public final <R> Flowable<R> replay(Function<? super Flowable<T>, ? extends Publisher<R>> selector, final int bufferSize, final long time, final TimeUnit unit, final Scheduler scheduler, boolean eagerTruncate) {
-        ObjectHelper.requireNonNull(selector, "selector is null");
-        ObjectHelper.requireNonNull(unit, "unit is null");
+        Objects.requireNonNull(selector, "selector is null");
+        Objects.requireNonNull(unit, "unit is null");
         ObjectHelper.verifyPositive(bufferSize, "bufferSize");
-        ObjectHelper.requireNonNull(scheduler, "scheduler is null");
+        Objects.requireNonNull(scheduler, "scheduler is null");
         return FlowableReplay.multicastSelector(
                 FlowableInternalHelper.replaySupplier(this, bufferSize, time, unit, scheduler, eagerTruncate), selector);
     }
@@ -12988,9 +12988,9 @@ public final <R> Flowable<R> replay(Function<? super Flowable<T>, ? extends Publ
     @BackpressureSupport(BackpressureKind.FULL)
     @SchedulerSupport(SchedulerSupport.CUSTOM)
     public final <R> Flowable<R> replay(Function<? super Flowable<T>, ? extends Publisher<R>> selector, final long time, final TimeUnit unit, final Scheduler scheduler) {
-        ObjectHelper.requireNonNull(selector, "selector is null");
-        ObjectHelper.requireNonNull(unit, "unit is null");
-        ObjectHelper.requireNonNull(scheduler, "scheduler is null");
+        Objects.requireNonNull(selector, "selector is null");
+        Objects.requireNonNull(unit, "unit is null");
+        Objects.requireNonNull(scheduler, "scheduler is null");
         return FlowableReplay.multicastSelector(FlowableInternalHelper.replaySupplier(this, time, unit, scheduler, false), selector);
     }
 
@@ -13033,9 +13033,9 @@ public final <R> Flowable<R> replay(Function<? super Flowable<T>, ? extends Publ
     @BackpressureSupport(BackpressureKind.FULL)
     @SchedulerSupport(SchedulerSupport.CUSTOM)
     public final <R> Flowable<R> replay(Function<? super Flowable<T>, ? extends Publisher<R>> selector, final long time, final TimeUnit unit, final Scheduler scheduler, boolean eagerTruncate) {
-        ObjectHelper.requireNonNull(selector, "selector is null");
-        ObjectHelper.requireNonNull(unit, "unit is null");
-        ObjectHelper.requireNonNull(scheduler, "scheduler is null");
+        Objects.requireNonNull(selector, "selector is null");
+        Objects.requireNonNull(unit, "unit is null");
+        Objects.requireNonNull(scheduler, "scheduler is null");
         return FlowableReplay.multicastSelector(FlowableInternalHelper.replaySupplier(this, time, unit, scheduler, eagerTruncate), selector);
     }
 
@@ -13194,8 +13194,8 @@ public final ConnectableFlowable<T> replay(int bufferSize, long time, TimeUnit u
     @SchedulerSupport(SchedulerSupport.CUSTOM)
     public final ConnectableFlowable<T> replay(final int bufferSize, final long time, final TimeUnit unit, final Scheduler scheduler) {
         ObjectHelper.verifyPositive(bufferSize, "bufferSize");
-        ObjectHelper.requireNonNull(unit, "unit is null");
-        ObjectHelper.requireNonNull(scheduler, "scheduler is null");
+        Objects.requireNonNull(unit, "unit is null");
+        Objects.requireNonNull(scheduler, "scheduler is null");
         ObjectHelper.verifyPositive(bufferSize, "bufferSize");
         return FlowableReplay.create(this, time, unit, scheduler, bufferSize, false);
     }
@@ -13244,8 +13244,8 @@ public final ConnectableFlowable<T> replay(final int bufferSize, final long time
     @SchedulerSupport(SchedulerSupport.CUSTOM)
     public final ConnectableFlowable<T> replay(final int bufferSize, final long time, final TimeUnit unit, final Scheduler scheduler, boolean eagerTruncate) {
         ObjectHelper.verifyPositive(bufferSize, "bufferSize");
-        ObjectHelper.requireNonNull(unit, "unit is null");
-        ObjectHelper.requireNonNull(scheduler, "scheduler is null");
+        Objects.requireNonNull(unit, "unit is null");
+        Objects.requireNonNull(scheduler, "scheduler is null");
         ObjectHelper.verifyPositive(bufferSize, "bufferSize");
         return FlowableReplay.create(this, time, unit, scheduler, bufferSize, eagerTruncate);
     }
@@ -13318,8 +13318,8 @@ public final ConnectableFlowable<T> replay(long time, TimeUnit unit) {
     @BackpressureSupport(BackpressureKind.FULL)
     @SchedulerSupport(SchedulerSupport.CUSTOM)
     public final ConnectableFlowable<T> replay(final long time, final TimeUnit unit, final Scheduler scheduler) {
-        ObjectHelper.requireNonNull(unit, "unit is null");
-        ObjectHelper.requireNonNull(scheduler, "scheduler is null");
+        Objects.requireNonNull(unit, "unit is null");
+        Objects.requireNonNull(scheduler, "scheduler is null");
         return FlowableReplay.create(this, time, unit, scheduler, false);
     }
 
@@ -13359,8 +13359,8 @@ public final ConnectableFlowable<T> replay(final long time, final TimeUnit unit,
     @BackpressureSupport(BackpressureKind.FULL)
     @SchedulerSupport(SchedulerSupport.CUSTOM)
     public final ConnectableFlowable<T> replay(final long time, final TimeUnit unit, final Scheduler scheduler, boolean eagerTruncate) {
-        ObjectHelper.requireNonNull(unit, "unit is null");
-        ObjectHelper.requireNonNull(scheduler, "scheduler is null");
+        Objects.requireNonNull(unit, "unit is null");
+        Objects.requireNonNull(scheduler, "scheduler is null");
         return FlowableReplay.create(this, time, unit, scheduler, eagerTruncate);
     }
 
@@ -13420,7 +13420,7 @@ public final Flowable<T> retry() {
     @BackpressureSupport(BackpressureKind.FULL)
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Flowable<T> retry(BiPredicate<? super Integer, ? super Throwable> predicate) {
-        ObjectHelper.requireNonNull(predicate, "predicate is null");
+        Objects.requireNonNull(predicate, "predicate is null");
 
         return RxJavaPlugins.onAssembly(new FlowableRetryBiPredicate<T>(this, predicate));
     }
@@ -13481,7 +13481,7 @@ public final Flowable<T> retry(long times, Predicate<? super Throwable> predicat
         if (times < 0) {
             throw new IllegalArgumentException("times >= 0 required but it was " + times);
         }
-        ObjectHelper.requireNonNull(predicate, "predicate is null");
+        Objects.requireNonNull(predicate, "predicate is null");
 
         return RxJavaPlugins.onAssembly(new FlowableRetryPredicate<T>(this, times, predicate));
     }
@@ -13523,7 +13523,7 @@ public final Flowable<T> retry(Predicate<? super Throwable> predicate) {
     @BackpressureSupport(BackpressureKind.FULL)
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Flowable<T> retryUntil(final BooleanSupplier stop) {
-        ObjectHelper.requireNonNull(stop, "stop is null");
+        Objects.requireNonNull(stop, "stop is null");
         return retry(Long.MAX_VALUE, Functions.predicateReverseFor(stop));
     }
 
@@ -13610,7 +13610,7 @@ public final Flowable<T> retryUntil(final BooleanSupplier stop) {
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Flowable<T> retryWhen(
             final Function<? super Flowable<Throwable>, ? extends Publisher<?>> handler) {
-        ObjectHelper.requireNonNull(handler, "handler is null");
+        Objects.requireNonNull(handler, "handler is null");
 
         return RxJavaPlugins.onAssembly(new FlowableRetryWhen<T>(this, handler));
     }
@@ -13632,7 +13632,7 @@ public final Flowable<T> retryWhen(
     @BackpressureSupport(BackpressureKind.PASS_THROUGH)
     @SchedulerSupport(SchedulerSupport.NONE)
     public final void safeSubscribe(Subscriber<? super T> s) {
-        ObjectHelper.requireNonNull(s, "s is null");
+        Objects.requireNonNull(s, "s is null");
         if (s instanceof SafeSubscriber) {
             subscribe((SafeSubscriber<? super T>)s);
         } else {
@@ -13733,8 +13733,8 @@ public final Flowable<T> sample(long period, TimeUnit unit, boolean emitLast) {
     @BackpressureSupport(BackpressureKind.ERROR)
     @SchedulerSupport(SchedulerSupport.CUSTOM)
     public final Flowable<T> sample(long period, TimeUnit unit, Scheduler scheduler) {
-        ObjectHelper.requireNonNull(unit, "unit is null");
-        ObjectHelper.requireNonNull(scheduler, "scheduler is null");
+        Objects.requireNonNull(unit, "unit is null");
+        Objects.requireNonNull(scheduler, "scheduler is null");
         return RxJavaPlugins.onAssembly(new FlowableSampleTimed<T>(this, period, unit, scheduler, false));
     }
 
@@ -13774,8 +13774,8 @@ public final Flowable<T> sample(long period, TimeUnit unit, Scheduler scheduler)
     @BackpressureSupport(BackpressureKind.ERROR)
     @SchedulerSupport(SchedulerSupport.CUSTOM)
     public final Flowable<T> sample(long period, TimeUnit unit, Scheduler scheduler, boolean emitLast) {
-        ObjectHelper.requireNonNull(unit, "unit is null");
-        ObjectHelper.requireNonNull(scheduler, "scheduler is null");
+        Objects.requireNonNull(unit, "unit is null");
+        Objects.requireNonNull(scheduler, "scheduler is null");
         return RxJavaPlugins.onAssembly(new FlowableSampleTimed<T>(this, period, unit, scheduler, emitLast));
     }
 
@@ -13806,7 +13806,7 @@ public final Flowable<T> sample(long period, TimeUnit unit, Scheduler scheduler,
     @BackpressureSupport(BackpressureKind.ERROR)
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <U> Flowable<T> sample(Publisher<U> sampler) {
-        ObjectHelper.requireNonNull(sampler, "sampler is null");
+        Objects.requireNonNull(sampler, "sampler is null");
         return RxJavaPlugins.onAssembly(new FlowableSamplePublisher<T>(this, sampler, false));
     }
 
@@ -13844,7 +13844,7 @@ public final <U> Flowable<T> sample(Publisher<U> sampler) {
     @BackpressureSupport(BackpressureKind.ERROR)
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <U> Flowable<T> sample(Publisher<U> sampler, boolean emitLast) {
-        ObjectHelper.requireNonNull(sampler, "sampler is null");
+        Objects.requireNonNull(sampler, "sampler is null");
         return RxJavaPlugins.onAssembly(new FlowableSamplePublisher<T>(this, sampler, emitLast));
     }
 
@@ -13877,7 +13877,7 @@ public final <U> Flowable<T> sample(Publisher<U> sampler, boolean emitLast) {
     @BackpressureSupport(BackpressureKind.FULL)
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Flowable<T> scan(BiFunction<T, T, T> accumulator) {
-        ObjectHelper.requireNonNull(accumulator, "accumulator is null");
+        Objects.requireNonNull(accumulator, "accumulator is null");
         return RxJavaPlugins.onAssembly(new FlowableScan<T>(this, accumulator));
     }
 
@@ -13931,7 +13931,7 @@ public final Flowable<T> scan(BiFunction<T, T, T> accumulator) {
     @BackpressureSupport(BackpressureKind.FULL)
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <R> Flowable<R> scan(final R initialValue, BiFunction<R, ? super T, R> accumulator) {
-        ObjectHelper.requireNonNull(initialValue, "initialValue is null");
+        Objects.requireNonNull(initialValue, "initialValue is null");
         return scanWith(Functions.justSupplier(initialValue), accumulator);
     }
 
@@ -13971,8 +13971,8 @@ public final <R> Flowable<R> scan(final R initialValue, BiFunction<R, ? super T,
     @BackpressureSupport(BackpressureKind.FULL)
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <R> Flowable<R> scanWith(Supplier<R> seedSupplier, BiFunction<R, ? super T, R> accumulator) {
-        ObjectHelper.requireNonNull(seedSupplier, "seedSupplier is null");
-        ObjectHelper.requireNonNull(accumulator, "accumulator is null");
+        Objects.requireNonNull(seedSupplier, "seedSupplier is null");
+        Objects.requireNonNull(accumulator, "accumulator is null");
         return RxJavaPlugins.onAssembly(new FlowableScanSeed<T, R>(this, seedSupplier, accumulator));
     }
 
@@ -14083,7 +14083,7 @@ public final Maybe<T> singleElement() {
     @BackpressureSupport(BackpressureKind.UNBOUNDED_IN)
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Single<T> single(T defaultItem) {
-        ObjectHelper.requireNonNull(defaultItem, "defaultItem is null");
+        Objects.requireNonNull(defaultItem, "defaultItem is null");
         return RxJavaPlugins.onAssembly(new FlowableSingleSingle<T>(this, defaultItem));
     }
 
@@ -14405,8 +14405,8 @@ public final Flowable<T> skipLast(long time, TimeUnit unit, Scheduler scheduler,
     @BackpressureSupport(BackpressureKind.UNBOUNDED_IN)
     @SchedulerSupport(SchedulerSupport.CUSTOM)
     public final Flowable<T> skipLast(long time, TimeUnit unit, Scheduler scheduler, boolean delayError, int bufferSize) {
-        ObjectHelper.requireNonNull(unit, "unit is null");
-        ObjectHelper.requireNonNull(scheduler, "scheduler is null");
+        Objects.requireNonNull(unit, "unit is null");
+        Objects.requireNonNull(scheduler, "scheduler is null");
         ObjectHelper.verifyPositive(bufferSize, "bufferSize");
         // the internal buffer holds pairs of (timestamp, value) so double the default buffer size
         int s = bufferSize << 1;
@@ -14439,7 +14439,7 @@ public final Flowable<T> skipLast(long time, TimeUnit unit, Scheduler scheduler,
     @BackpressureSupport(BackpressureKind.FULL)
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <U> Flowable<T> skipUntil(Publisher<U> other) {
-        ObjectHelper.requireNonNull(other, "other is null");
+        Objects.requireNonNull(other, "other is null");
         return RxJavaPlugins.onAssembly(new FlowableSkipUntil<T, U>(this, other));
     }
 
@@ -14467,7 +14467,7 @@ public final <U> Flowable<T> skipUntil(Publisher<U> other) {
     @BackpressureSupport(BackpressureKind.FULL)
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Flowable<T> skipWhile(Predicate<? super T> predicate) {
-        ObjectHelper.requireNonNull(predicate, "predicate is null");
+        Objects.requireNonNull(predicate, "predicate is null");
         return RxJavaPlugins.onAssembly(new FlowableSkipWhile<T>(this, predicate));
     }
     /**
@@ -14523,7 +14523,7 @@ public final Flowable<T> sorted() {
     @BackpressureSupport(BackpressureKind.FULL)
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Flowable<T> sorted(Comparator<? super T> sortFunction) {
-        ObjectHelper.requireNonNull(sortFunction, "sortFunction");
+        Objects.requireNonNull(sortFunction, "sortFunction");
         return toList().toFlowable().map(Functions.listSorter(sortFunction)).flatMapIterable(Functions.<List<T>>identity());
     }
 
@@ -14582,7 +14582,7 @@ public final Flowable<T> startWithIterable(Iterable<? extends T> items) {
     @BackpressureSupport(BackpressureKind.FULL)
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Flowable<T> startWith(Publisher<? extends T> other) {
-        ObjectHelper.requireNonNull(other, "other is null");
+        Objects.requireNonNull(other, "other is null");
         return concatArray(other, this);
     }
 
@@ -14614,7 +14614,7 @@ public final Flowable<T> startWith(Publisher<? extends T> other) {
     @BackpressureSupport(BackpressureKind.FULL)
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Flowable<T> startWithItem(T item) {
-        ObjectHelper.requireNonNull(item, "item is null");
+        Objects.requireNonNull(item, "item is null");
         return concatArray(just(item), this);
     }
 
@@ -14767,9 +14767,9 @@ public final Disposable subscribe(Consumer<? super T> onNext, Consumer<? super T
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Disposable subscribe(Consumer<? super T> onNext, Consumer<? super Throwable> onError,
             Action onComplete) {
-        ObjectHelper.requireNonNull(onNext, "onNext is null");
-        ObjectHelper.requireNonNull(onError, "onError is null");
-        ObjectHelper.requireNonNull(onComplete, "onComplete is null");
+        Objects.requireNonNull(onNext, "onNext is null");
+        Objects.requireNonNull(onError, "onError is null");
+        Objects.requireNonNull(onComplete, "onComplete is null");
 
         LambdaSubscriber<T> ls = new LambdaSubscriber<T>(onNext, onError, onComplete, FlowableInternalHelper.RequestMax.INSTANCE);
 
@@ -14785,7 +14785,7 @@ public final void subscribe(Subscriber<? super T> s) {
         if (s instanceof FlowableSubscriber) {
             subscribe((FlowableSubscriber<? super T>)s);
         } else {
-            ObjectHelper.requireNonNull(s, "s is null");
+            Objects.requireNonNull(s, "s is null");
             subscribe(new StrictSubscriber<T>(s));
         }
     }
@@ -14830,11 +14830,11 @@ public final void subscribe(Subscriber<? super T> s) {
     @BackpressureSupport(BackpressureKind.SPECIAL)
     @SchedulerSupport(SchedulerSupport.NONE)
     public final void subscribe(FlowableSubscriber<? super T> s) {
-        ObjectHelper.requireNonNull(s, "s is null");
+        Objects.requireNonNull(s, "s is null");
         try {
             Subscriber<? super T> z = RxJavaPlugins.onSubscribe(this, s);
 
-            ObjectHelper.requireNonNull(z, "The RxJavaPlugins.onSubscribe hook returned a null FlowableSubscriber. Please check the handler provided to RxJavaPlugins.setOnFlowableSubscribe for invalid null returns. Further reading: https://github.com/ReactiveX/RxJava/wiki/Plugins");
+            Objects.requireNonNull(z, "The RxJavaPlugins.onSubscribe hook returned a null FlowableSubscriber. Please check the handler provided to RxJavaPlugins.setOnFlowableSubscribe for invalid null returns. Further reading: https://github.com/ReactiveX/RxJava/wiki/Plugins");
 
             subscribeActual(z);
         } catch (NullPointerException e) { // NOPMD
@@ -14926,7 +14926,7 @@ public final <E extends Subscriber<? super T>> E subscribeWith(E subscriber) {
     @BackpressureSupport(BackpressureKind.PASS_THROUGH)
     @SchedulerSupport(SchedulerSupport.CUSTOM)
     public final Flowable<T> subscribeOn(@NonNull Scheduler scheduler) {
-        ObjectHelper.requireNonNull(scheduler, "scheduler is null");
+        Objects.requireNonNull(scheduler, "scheduler is null");
         return subscribeOn(scheduler, !(this instanceof FlowableCreate));
     }
 
@@ -14964,7 +14964,7 @@ public final Flowable<T> subscribeOn(@NonNull Scheduler scheduler) {
     @BackpressureSupport(BackpressureKind.PASS_THROUGH)
     @SchedulerSupport(SchedulerSupport.CUSTOM)
     public final Flowable<T> subscribeOn(@NonNull Scheduler scheduler, boolean requestOn) {
-        ObjectHelper.requireNonNull(scheduler, "scheduler is null");
+        Objects.requireNonNull(scheduler, "scheduler is null");
         return RxJavaPlugins.onAssembly(new FlowableSubscribeOn<T>(this, scheduler, requestOn));
     }
 
@@ -14995,7 +14995,7 @@ public final Flowable<T> subscribeOn(@NonNull Scheduler scheduler, boolean reque
     @BackpressureSupport(BackpressureKind.FULL)
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Flowable<T> switchIfEmpty(Publisher<? extends T> other) {
-        ObjectHelper.requireNonNull(other, "other is null");
+        Objects.requireNonNull(other, "other is null");
         return RxJavaPlugins.onAssembly(new FlowableSwitchIfEmpty<T>(this, other));
     }
 
@@ -15111,7 +15111,7 @@ public final <R> Flowable<R> switchMap(Function<? super T, ? extends Publisher<?
     @BackpressureSupport(BackpressureKind.UNBOUNDED_IN)
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Completable switchMapCompletable(@NonNull Function<? super T, ? extends CompletableSource> mapper) {
-        ObjectHelper.requireNonNull(mapper, "mapper is null");
+        Objects.requireNonNull(mapper, "mapper is null");
         return RxJavaPlugins.onAssembly(new FlowableSwitchMapCompletable<T>(this, mapper, false));
     }
 
@@ -15158,7 +15158,7 @@ public final Completable switchMapCompletable(@NonNull Function<? super T, ? ext
     @BackpressureSupport(BackpressureKind.UNBOUNDED_IN)
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Completable switchMapCompletableDelayError(@NonNull Function<? super T, ? extends CompletableSource> mapper) {
-        ObjectHelper.requireNonNull(mapper, "mapper is null");
+        Objects.requireNonNull(mapper, "mapper is null");
         return RxJavaPlugins.onAssembly(new FlowableSwitchMapCompletable<T>(this, mapper, true));
     }
 
@@ -15237,7 +15237,7 @@ public final <R> Flowable<R> switchMapDelayError(Function<? super T, ? extends P
     }
 
     <R> Flowable<R> switchMap0(Function<? super T, ? extends Publisher<? extends R>> mapper, int bufferSize, boolean delayError) {
-        ObjectHelper.requireNonNull(mapper, "mapper is null");
+        Objects.requireNonNull(mapper, "mapper is null");
         ObjectHelper.verifyPositive(bufferSize, "bufferSize");
         if (this instanceof ScalarSupplier) {
             @SuppressWarnings("unchecked")
@@ -15287,7 +15287,7 @@ <R> Flowable<R> switchMap0(Function<? super T, ? extends Publisher<? extends R>>
     @BackpressureSupport(BackpressureKind.UNBOUNDED_IN)
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <R> Flowable<R> switchMapMaybe(@NonNull Function<? super T, ? extends MaybeSource<? extends R>> mapper) {
-        ObjectHelper.requireNonNull(mapper, "mapper is null");
+        Objects.requireNonNull(mapper, "mapper is null");
         return RxJavaPlugins.onAssembly(new FlowableSwitchMapMaybe<T, R>(this, mapper, false));
     }
 
@@ -15318,7 +15318,7 @@ public final <R> Flowable<R> switchMapMaybe(@NonNull Function<? super T, ? exten
     @BackpressureSupport(BackpressureKind.UNBOUNDED_IN)
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <R> Flowable<R> switchMapMaybeDelayError(@NonNull Function<? super T, ? extends MaybeSource<? extends R>> mapper) {
-        ObjectHelper.requireNonNull(mapper, "mapper is null");
+        Objects.requireNonNull(mapper, "mapper is null");
         return RxJavaPlugins.onAssembly(new FlowableSwitchMapMaybe<T, R>(this, mapper, true));
     }
 
@@ -15359,7 +15359,7 @@ public final <R> Flowable<R> switchMapMaybeDelayError(@NonNull Function<? super
     @BackpressureSupport(BackpressureKind.UNBOUNDED_IN)
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <R> Flowable<R> switchMapSingle(@NonNull Function<? super T, ? extends SingleSource<? extends R>> mapper) {
-        ObjectHelper.requireNonNull(mapper, "mapper is null");
+        Objects.requireNonNull(mapper, "mapper is null");
         return RxJavaPlugins.onAssembly(new FlowableSwitchMapSingle<T, R>(this, mapper, false));
     }
 
@@ -15390,7 +15390,7 @@ public final <R> Flowable<R> switchMapSingle(@NonNull Function<? super T, ? exte
     @BackpressureSupport(BackpressureKind.UNBOUNDED_IN)
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <R> Flowable<R> switchMapSingleDelayError(@NonNull Function<? super T, ? extends SingleSource<? extends R>> mapper) {
-        ObjectHelper.requireNonNull(mapper, "mapper is null");
+        Objects.requireNonNull(mapper, "mapper is null");
         return RxJavaPlugins.onAssembly(new FlowableSwitchMapSingle<T, R>(this, mapper, true));
     }
 
@@ -15650,8 +15650,8 @@ public final Flowable<T> takeLast(long count, long time, TimeUnit unit, Schedule
     @BackpressureSupport(BackpressureKind.FULL)
     @SchedulerSupport(SchedulerSupport.CUSTOM)
     public final Flowable<T> takeLast(long count, long time, TimeUnit unit, Scheduler scheduler, boolean delayError, int bufferSize) {
-        ObjectHelper.requireNonNull(unit, "unit is null");
-        ObjectHelper.requireNonNull(scheduler, "scheduler is null");
+        Objects.requireNonNull(unit, "unit is null");
+        Objects.requireNonNull(scheduler, "scheduler is null");
         ObjectHelper.verifyPositive(bufferSize, "bufferSize");
         if (count < 0) {
             throw new IndexOutOfBoundsException("count >= 0 required but it was " + count);
@@ -15862,7 +15862,7 @@ public final Flowable<T> takeLast(long time, TimeUnit unit, Scheduler scheduler,
     @BackpressureSupport(BackpressureKind.PASS_THROUGH)
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Flowable<T> takeUntil(Predicate<? super T> stopPredicate) {
-        ObjectHelper.requireNonNull(stopPredicate, "stopPredicate is null");
+        Objects.requireNonNull(stopPredicate, "stopPredicate is null");
         return RxJavaPlugins.onAssembly(new FlowableTakeUntilPredicate<T>(this, stopPredicate));
     }
 
@@ -15892,7 +15892,7 @@ public final Flowable<T> takeUntil(Predicate<? super T> stopPredicate) {
     @BackpressureSupport(BackpressureKind.PASS_THROUGH)
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <U> Flowable<T> takeUntil(Publisher<U> other) {
-        ObjectHelper.requireNonNull(other, "other is null");
+        Objects.requireNonNull(other, "other is null");
         return RxJavaPlugins.onAssembly(new FlowableTakeUntil<T, U>(this, other));
     }
 
@@ -15921,7 +15921,7 @@ public final <U> Flowable<T> takeUntil(Publisher<U> other) {
     @BackpressureSupport(BackpressureKind.PASS_THROUGH)
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Flowable<T> takeWhile(Predicate<? super T> predicate) {
-        ObjectHelper.requireNonNull(predicate, "predicate is null");
+        Objects.requireNonNull(predicate, "predicate is null");
         return RxJavaPlugins.onAssembly(new FlowableTakeWhile<T>(this, predicate));
     }
 
@@ -15986,8 +15986,8 @@ public final Flowable<T> throttleFirst(long windowDuration, TimeUnit unit) {
     @BackpressureSupport(BackpressureKind.ERROR)
     @SchedulerSupport(SchedulerSupport.CUSTOM)
     public final Flowable<T> throttleFirst(long skipDuration, TimeUnit unit, Scheduler scheduler) {
-        ObjectHelper.requireNonNull(unit, "unit is null");
-        ObjectHelper.requireNonNull(scheduler, "scheduler is null");
+        Objects.requireNonNull(unit, "unit is null");
+        Objects.requireNonNull(scheduler, "scheduler is null");
         return RxJavaPlugins.onAssembly(new FlowableThrottleFirstTimed<T>(this, skipDuration, unit, scheduler));
     }
 
@@ -16206,8 +16206,8 @@ public final Flowable<T> throttleLatest(long timeout, TimeUnit unit, Scheduler s
     @BackpressureSupport(BackpressureKind.ERROR)
     @SchedulerSupport(SchedulerSupport.CUSTOM)
     public final Flowable<T> throttleLatest(long timeout, TimeUnit unit, Scheduler scheduler, boolean emitLast) {
-        ObjectHelper.requireNonNull(unit, "unit is null");
-        ObjectHelper.requireNonNull(scheduler, "scheduler is null");
+        Objects.requireNonNull(unit, "unit is null");
+        Objects.requireNonNull(scheduler, "scheduler is null");
         return RxJavaPlugins.onAssembly(new FlowableThrottleLatest<T>(this, timeout, unit, scheduler, emitLast));
     }
 
@@ -16383,8 +16383,8 @@ public final Flowable<Timed<T>> timeInterval(TimeUnit unit) {
     @BackpressureSupport(BackpressureKind.PASS_THROUGH)
     @SchedulerSupport(SchedulerSupport.NONE) // Supplied scheduler is only used for creating timestamps.
     public final Flowable<Timed<T>> timeInterval(TimeUnit unit, Scheduler scheduler) {
-        ObjectHelper.requireNonNull(unit, "unit is null");
-        ObjectHelper.requireNonNull(scheduler, "scheduler is null");
+        Objects.requireNonNull(unit, "unit is null");
+        Objects.requireNonNull(scheduler, "scheduler is null");
         return RxJavaPlugins.onAssembly(new FlowableTimeInterval<T>(this, unit, scheduler));
     }
 
@@ -16460,7 +16460,7 @@ public final <V> Flowable<T> timeout(Function<? super T, ? extends Publisher<V>>
     @BackpressureSupport(BackpressureKind.FULL)
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <V> Flowable<T> timeout(Function<? super T, ? extends Publisher<V>> itemTimeoutIndicator, Flowable<? extends T> other) {
-        ObjectHelper.requireNonNull(other, "other is null");
+        Objects.requireNonNull(other, "other is null");
         return timeout0(null, itemTimeoutIndicator, other);
     }
 
@@ -16523,7 +16523,7 @@ public final Flowable<T> timeout(long timeout, TimeUnit timeUnit) {
     @BackpressureSupport(BackpressureKind.FULL)
     @SchedulerSupport(SchedulerSupport.COMPUTATION)
     public final Flowable<T> timeout(long timeout, TimeUnit timeUnit, Publisher<? extends T> other) {
-        ObjectHelper.requireNonNull(other, "other is null");
+        Objects.requireNonNull(other, "other is null");
         return timeout0(timeout, timeUnit, other, Schedulers.computation());
     }
 
@@ -16561,7 +16561,7 @@ public final Flowable<T> timeout(long timeout, TimeUnit timeUnit, Publisher<? ex
     @BackpressureSupport(BackpressureKind.FULL)
     @SchedulerSupport(SchedulerSupport.CUSTOM)
     public final Flowable<T> timeout(long timeout, TimeUnit timeUnit, Scheduler scheduler, Publisher<? extends T> other) {
-        ObjectHelper.requireNonNull(other, "other is null");
+        Objects.requireNonNull(other, "other is null");
         return timeout0(timeout, timeUnit, other, scheduler);
     }
 
@@ -16634,7 +16634,7 @@ public final Flowable<T> timeout(long timeout, TimeUnit timeUnit, Scheduler sche
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <U, V> Flowable<T> timeout(Publisher<U> firstTimeoutIndicator,
             Function<? super T, ? extends Publisher<V>> itemTimeoutIndicator) {
-        ObjectHelper.requireNonNull(firstTimeoutIndicator, "firstTimeoutIndicator is null");
+        Objects.requireNonNull(firstTimeoutIndicator, "firstTimeoutIndicator is null");
         return timeout0(firstTimeoutIndicator, itemTimeoutIndicator, null);
     }
 
@@ -16682,15 +16682,15 @@ public final <U, V> Flowable<T> timeout(
             Publisher<U> firstTimeoutIndicator,
             Function<? super T, ? extends Publisher<V>> itemTimeoutIndicator,
                     Publisher<? extends T> other) {
-        ObjectHelper.requireNonNull(firstTimeoutIndicator, "firstTimeoutSelector is null");
-        ObjectHelper.requireNonNull(other, "other is null");
+        Objects.requireNonNull(firstTimeoutIndicator, "firstTimeoutSelector is null");
+        Objects.requireNonNull(other, "other is null");
         return timeout0(firstTimeoutIndicator, itemTimeoutIndicator, other);
     }
 
     private Flowable<T> timeout0(long timeout, TimeUnit timeUnit, Publisher<? extends T> other,
             Scheduler scheduler) {
-        ObjectHelper.requireNonNull(timeUnit, "timeUnit is null");
-        ObjectHelper.requireNonNull(scheduler, "scheduler is null");
+        Objects.requireNonNull(timeUnit, "timeUnit is null");
+        Objects.requireNonNull(scheduler, "scheduler is null");
         return RxJavaPlugins.onAssembly(new FlowableTimeoutTimed<T>(this, timeout, timeUnit, scheduler, other));
     }
 
@@ -16698,7 +16698,7 @@ private <U, V> Flowable<T> timeout0(
             Publisher<U> firstTimeoutIndicator,
             Function<? super T, ? extends Publisher<V>> itemTimeoutIndicator,
                     Publisher<? extends T> other) {
-        ObjectHelper.requireNonNull(itemTimeoutIndicator, "itemTimeoutIndicator is null");
+        Objects.requireNonNull(itemTimeoutIndicator, "itemTimeoutIndicator is null");
         return RxJavaPlugins.onAssembly(new FlowableTimeout<T, U, V>(this, firstTimeoutIndicator, itemTimeoutIndicator, other));
     }
 
@@ -16804,8 +16804,8 @@ public final Flowable<Timed<T>> timestamp(TimeUnit unit) {
     @BackpressureSupport(BackpressureKind.PASS_THROUGH)
     @SchedulerSupport(SchedulerSupport.NONE) // Supplied scheduler is only used for creating timestamps.
     public final Flowable<Timed<T>> timestamp(final TimeUnit unit, final Scheduler scheduler) {
-        ObjectHelper.requireNonNull(unit, "unit is null");
-        ObjectHelper.requireNonNull(scheduler, "scheduler is null");
+        Objects.requireNonNull(unit, "unit is null");
+        Objects.requireNonNull(scheduler, "scheduler is null");
         return map(Functions.<T>timestampWith(unit, scheduler));
     }
 
@@ -16830,7 +16830,7 @@ public final Flowable<Timed<T>> timestamp(final TimeUnit unit, final Scheduler s
     @BackpressureSupport(BackpressureKind.SPECIAL)
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <R> R to(@NonNull FlowableConverter<T, ? extends R> converter) {
-        return ObjectHelper.requireNonNull(converter, "converter is null").apply(this);
+        return Objects.requireNonNull(converter, "converter is null").apply(this);
     }
 
     /**
@@ -16938,7 +16938,7 @@ public final Single<List<T>> toList(final int capacityHint) {
     @BackpressureSupport(BackpressureKind.UNBOUNDED_IN)
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <U extends Collection<? super T>> Single<U> toList(Supplier<U> collectionSupplier) {
-        ObjectHelper.requireNonNull(collectionSupplier, "collectionSupplier is null");
+        Objects.requireNonNull(collectionSupplier, "collectionSupplier is null");
         return RxJavaPlugins.onAssembly(new FlowableToListSingle<T, U>(this, collectionSupplier));
     }
 
@@ -16973,7 +16973,7 @@ public final <U extends Collection<? super T>> Single<U> toList(Supplier<U> coll
     @BackpressureSupport(BackpressureKind.UNBOUNDED_IN)
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <K> Single<Map<K, T>> toMap(final Function<? super T, ? extends K> keySelector) {
-        ObjectHelper.requireNonNull(keySelector, "keySelector is null");
+        Objects.requireNonNull(keySelector, "keySelector is null");
         return collect(HashMapSupplier.<K, T>asSupplier(), Functions.toMapKeySelector(keySelector));
     }
 
@@ -17012,8 +17012,8 @@ public final <K> Single<Map<K, T>> toMap(final Function<? super T, ? extends K>
     @BackpressureSupport(BackpressureKind.UNBOUNDED_IN)
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <K, V> Single<Map<K, V>> toMap(final Function<? super T, ? extends K> keySelector, final Function<? super T, ? extends V> valueSelector) {
-        ObjectHelper.requireNonNull(keySelector, "keySelector is null");
-        ObjectHelper.requireNonNull(valueSelector, "valueSelector is null");
+        Objects.requireNonNull(keySelector, "keySelector is null");
+        Objects.requireNonNull(valueSelector, "valueSelector is null");
         return collect(HashMapSupplier.<K, V>asSupplier(), Functions.toMapKeyValueSelector(keySelector, valueSelector));
     }
 
@@ -17053,8 +17053,8 @@ public final <K, V> Single<Map<K, V>> toMap(final Function<? super T, ? extends
     public final <K, V> Single<Map<K, V>> toMap(final Function<? super T, ? extends K> keySelector,
             final Function<? super T, ? extends V> valueSelector,
             final Supplier<? extends Map<K, V>> mapSupplier) {
-        ObjectHelper.requireNonNull(keySelector, "keySelector is null");
-        ObjectHelper.requireNonNull(valueSelector, "valueSelector is null");
+        Objects.requireNonNull(keySelector, "keySelector is null");
+        Objects.requireNonNull(valueSelector, "valueSelector is null");
         return collect(mapSupplier, Functions.toMapKeyValueSelector(keySelector, valueSelector));
     }
 
@@ -17169,10 +17169,10 @@ public final <K, V> Single<Map<K, Collection<V>>> toMultimap(
             final Function<? super T, ? extends V> valueSelector,
             final Supplier<? extends Map<K, Collection<V>>> mapSupplier,
             final Function<? super K, ? extends Collection<? super V>> collectionFactory) {
-        ObjectHelper.requireNonNull(keySelector, "keySelector is null");
-        ObjectHelper.requireNonNull(valueSelector, "valueSelector is null");
-        ObjectHelper.requireNonNull(mapSupplier, "mapSupplier is null");
-        ObjectHelper.requireNonNull(collectionFactory, "collectionFactory is null");
+        Objects.requireNonNull(keySelector, "keySelector is null");
+        Objects.requireNonNull(valueSelector, "valueSelector is null");
+        Objects.requireNonNull(mapSupplier, "mapSupplier is null");
+        Objects.requireNonNull(collectionFactory, "collectionFactory is null");
         return collect(mapSupplier, Functions.toMultimapKeyValueSelector(keySelector, valueSelector, collectionFactory));
     }
 
@@ -17297,7 +17297,7 @@ public final Single<List<T>> toSortedList() {
     @BackpressureSupport(BackpressureKind.UNBOUNDED_IN)
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Single<List<T>> toSortedList(final Comparator<? super T> comparator) {
-        ObjectHelper.requireNonNull(comparator, "comparator is null");
+        Objects.requireNonNull(comparator, "comparator is null");
         return toList().map(Functions.listSorter(comparator));
     }
 
@@ -17333,7 +17333,7 @@ public final Single<List<T>> toSortedList(final Comparator<? super T> comparator
     @BackpressureSupport(BackpressureKind.UNBOUNDED_IN)
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Single<List<T>> toSortedList(final Comparator<? super T> comparator, int capacityHint) {
-        ObjectHelper.requireNonNull(comparator, "comparator is null");
+        Objects.requireNonNull(comparator, "comparator is null");
         return toList(capacityHint).map(Functions.listSorter(comparator));
     }
 
@@ -17395,7 +17395,7 @@ public final Single<List<T>> toSortedList(int capacityHint) {
     @BackpressureSupport(BackpressureKind.PASS_THROUGH)
     @SchedulerSupport(SchedulerSupport.CUSTOM)
     public final Flowable<T> unsubscribeOn(Scheduler scheduler) {
-        ObjectHelper.requireNonNull(scheduler, "scheduler is null");
+        Objects.requireNonNull(scheduler, "scheduler is null");
         return RxJavaPlugins.onAssembly(new FlowableUnsubscribeOn<T>(this, scheduler));
     }
 
@@ -17638,8 +17638,8 @@ public final Flowable<Flowable<T>> window(long timespan, long timeskip, TimeUnit
         ObjectHelper.verifyPositive(bufferSize, "bufferSize");
         ObjectHelper.verifyPositive(timespan, "timespan");
         ObjectHelper.verifyPositive(timeskip, "timeskip");
-        ObjectHelper.requireNonNull(scheduler, "scheduler is null");
-        ObjectHelper.requireNonNull(unit, "unit is null");
+        Objects.requireNonNull(scheduler, "scheduler is null");
+        Objects.requireNonNull(unit, "unit is null");
         return RxJavaPlugins.onAssembly(new FlowableWindowTimed<T>(this, timespan, timeskip, unit, scheduler, Long.MAX_VALUE, bufferSize, false));
     }
 
@@ -17952,8 +17952,8 @@ public final Flowable<Flowable<T>> window(
             long timespan, TimeUnit unit, Scheduler scheduler,
             long count, boolean restart, int bufferSize) {
         ObjectHelper.verifyPositive(bufferSize, "bufferSize");
-        ObjectHelper.requireNonNull(scheduler, "scheduler is null");
-        ObjectHelper.requireNonNull(unit, "unit is null");
+        Objects.requireNonNull(scheduler, "scheduler is null");
+        Objects.requireNonNull(unit, "unit is null");
         ObjectHelper.verifyPositive(count, "count");
         return RxJavaPlugins.onAssembly(new FlowableWindowTimed<T>(this, timespan, timespan, unit, scheduler, count, bufferSize, restart));
     }
@@ -18028,7 +18028,7 @@ public final <B> Flowable<Flowable<T>> window(Publisher<B> boundaryIndicator) {
     @BackpressureSupport(BackpressureKind.ERROR)
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <B> Flowable<Flowable<T>> window(Publisher<B> boundaryIndicator, int bufferSize) {
-        ObjectHelper.requireNonNull(boundaryIndicator, "boundaryIndicator is null");
+        Objects.requireNonNull(boundaryIndicator, "boundaryIndicator is null");
         ObjectHelper.verifyPositive(bufferSize, "bufferSize");
         return RxJavaPlugins.onAssembly(new FlowableWindowBoundary<T, B>(this, boundaryIndicator, bufferSize));
     }
@@ -18117,8 +18117,8 @@ public final <U, V> Flowable<Flowable<T>> window(
     public final <U, V> Flowable<Flowable<T>> window(
             Publisher<U> openingIndicator,
             Function<? super U, ? extends Publisher<V>> closingIndicator, int bufferSize) {
-        ObjectHelper.requireNonNull(openingIndicator, "openingIndicator is null");
-        ObjectHelper.requireNonNull(closingIndicator, "closingIndicator is null");
+        Objects.requireNonNull(openingIndicator, "openingIndicator is null");
+        Objects.requireNonNull(closingIndicator, "closingIndicator is null");
         ObjectHelper.verifyPositive(bufferSize, "bufferSize");
         return RxJavaPlugins.onAssembly(new FlowableWindowBoundarySelector<T, U, V>(this, openingIndicator, closingIndicator, bufferSize));
     }
@@ -18157,8 +18157,8 @@ public final <U, V> Flowable<Flowable<T>> window(
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <U, R> Flowable<R> withLatestFrom(Publisher<? extends U> other,
             BiFunction<? super T, ? super U, ? extends R> combiner) {
-        ObjectHelper.requireNonNull(other, "other is null");
-        ObjectHelper.requireNonNull(combiner, "combiner is null");
+        Objects.requireNonNull(other, "other is null");
+        Objects.requireNonNull(combiner, "combiner is null");
 
         return RxJavaPlugins.onAssembly(new FlowableWithLatestFrom<T, U, R>(this, combiner, other));
     }
@@ -18195,8 +18195,8 @@ public final <U, R> Flowable<R> withLatestFrom(Publisher<? extends U> other,
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <T1, T2, R> Flowable<R> withLatestFrom(Publisher<T1> source1, Publisher<T2> source2,
             Function3<? super T, ? super T1, ? super T2, R> combiner) {
-        ObjectHelper.requireNonNull(source1, "source1 is null");
-        ObjectHelper.requireNonNull(source2, "source2 is null");
+        Objects.requireNonNull(source1, "source1 is null");
+        Objects.requireNonNull(source2, "source2 is null");
         Function<Object[], R> f = Functions.toFunction(combiner);
         return withLatestFrom(new Publisher[] { source1, source2 }, f);
     }
@@ -18237,9 +18237,9 @@ public final <T1, T2, T3, R> Flowable<R> withLatestFrom(
             Publisher<T1> source1, Publisher<T2> source2,
             Publisher<T3> source3,
             Function4<? super T, ? super T1, ? super T2, ? super T3, R> combiner) {
-        ObjectHelper.requireNonNull(source1, "source1 is null");
-        ObjectHelper.requireNonNull(source2, "source2 is null");
-        ObjectHelper.requireNonNull(source3, "source3 is null");
+        Objects.requireNonNull(source1, "source1 is null");
+        Objects.requireNonNull(source2, "source2 is null");
+        Objects.requireNonNull(source3, "source3 is null");
         Function<Object[], R> f = Functions.toFunction(combiner);
         return withLatestFrom(new Publisher[] { source1, source2, source3 }, f);
     }
@@ -18282,10 +18282,10 @@ public final <T1, T2, T3, T4, R> Flowable<R> withLatestFrom(
             Publisher<T1> source1, Publisher<T2> source2,
             Publisher<T3> source3, Publisher<T4> source4,
             Function5<? super T, ? super T1, ? super T2, ? super T3, ? super T4, R> combiner) {
-        ObjectHelper.requireNonNull(source1, "source1 is null");
-        ObjectHelper.requireNonNull(source2, "source2 is null");
-        ObjectHelper.requireNonNull(source3, "source3 is null");
-        ObjectHelper.requireNonNull(source4, "source4 is null");
+        Objects.requireNonNull(source1, "source1 is null");
+        Objects.requireNonNull(source2, "source2 is null");
+        Objects.requireNonNull(source3, "source3 is null");
+        Objects.requireNonNull(source4, "source4 is null");
         Function<Object[], R> f = Functions.toFunction(combiner);
         return withLatestFrom(new Publisher[] { source1, source2, source3, source4 }, f);
     }
@@ -18318,8 +18318,8 @@ public final <T1, T2, T3, T4, R> Flowable<R> withLatestFrom(
     @BackpressureSupport(BackpressureKind.PASS_THROUGH)
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <R> Flowable<R> withLatestFrom(Publisher<?>[] others, Function<? super Object[], R> combiner) {
-        ObjectHelper.requireNonNull(others, "others is null");
-        ObjectHelper.requireNonNull(combiner, "combiner is null");
+        Objects.requireNonNull(others, "others is null");
+        Objects.requireNonNull(combiner, "combiner is null");
         return RxJavaPlugins.onAssembly(new FlowableWithLatestFromMany<T, R>(this, others, combiner));
     }
 
@@ -18351,8 +18351,8 @@ public final <R> Flowable<R> withLatestFrom(Publisher<?>[] others, Function<? su
     @BackpressureSupport(BackpressureKind.PASS_THROUGH)
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <R> Flowable<R> withLatestFrom(Iterable<? extends Publisher<?>> others, Function<? super Object[], R> combiner) {
-        ObjectHelper.requireNonNull(others, "others is null");
-        ObjectHelper.requireNonNull(combiner, "combiner is null");
+        Objects.requireNonNull(others, "others is null");
+        Objects.requireNonNull(combiner, "combiner is null");
         return RxJavaPlugins.onAssembly(new FlowableWithLatestFromMany<T, R>(this, others, combiner));
     }
 
@@ -18391,8 +18391,8 @@ public final <R> Flowable<R> withLatestFrom(Iterable<? extends Publisher<?>> oth
     @BackpressureSupport(BackpressureKind.FULL)
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <U, R> Flowable<R> zipWith(Iterable<U> other,  BiFunction<? super T, ? super U, ? extends R> zipper) {
-        ObjectHelper.requireNonNull(other, "other is null");
-        ObjectHelper.requireNonNull(zipper, "zipper is null");
+        Objects.requireNonNull(other, "other is null");
+        Objects.requireNonNull(zipper, "zipper is null");
         return RxJavaPlugins.onAssembly(new FlowableZipIterable<T, U, R>(this, other, zipper));
     }
 
@@ -18440,7 +18440,7 @@ public final <U, R> Flowable<R> zipWith(Iterable<U> other,  BiFunction<? super T
     @BackpressureSupport(BackpressureKind.FULL)
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <U, R> Flowable<R> zipWith(Publisher<? extends U> other, BiFunction<? super T, ? super U, ? extends R> zipper) {
-        ObjectHelper.requireNonNull(other, "other is null");
+        Objects.requireNonNull(other, "other is null");
         return zip(this, other, zipper);
     }
 
@@ -18653,7 +18653,7 @@ public final TestSubscriber<T> test(long initialRequest, boolean cancel) { // No
     @SchedulerSupport(SchedulerSupport.NONE)
     @NonNull
     public static <T> Flowable<@NonNull T> fromOptional(@NonNull Optional<T> optional) {
-        ObjectHelper.requireNonNull(optional, "optional is null");
+        Objects.requireNonNull(optional, "optional is null");
         return optional.map(Flowable::just).orElseGet(Flowable::empty);
     }
 
@@ -18690,7 +18690,7 @@ public final TestSubscriber<T> test(long initialRequest, boolean cancel) { // No
     @SchedulerSupport(SchedulerSupport.NONE)
     @NonNull
     public static <T> Flowable<@NonNull T> fromCompletionStage(@NonNull CompletionStage<T> stage) {
-        ObjectHelper.requireNonNull(stage, "stage is null");
+        Objects.requireNonNull(stage, "stage is null");
         return RxJavaPlugins.onAssembly(new FlowableFromCompletionStage<>(stage));
     }
 
@@ -18736,7 +18736,7 @@ public final TestSubscriber<T> test(long initialRequest, boolean cancel) { // No
     @SchedulerSupport(SchedulerSupport.NONE)
     @NonNull
     public static <T> Flowable<@NonNull T> fromStream(@NonNull Stream<T> stream) {
-        ObjectHelper.requireNonNull(stream, "stream is null");
+        Objects.requireNonNull(stream, "stream is null");
         return RxJavaPlugins.onAssembly(new FlowableFromStream<>(stream));
     }
 }
diff --git a/src/main/java/io/reactivex/rxjava3/core/Maybe.java b/src/main/java/io/reactivex/rxjava3/core/Maybe.java
index 9bcf753e85..e3f4641ad3 100644
--- a/src/main/java/io/reactivex/rxjava3/core/Maybe.java
+++ b/src/main/java/io/reactivex/rxjava3/core/Maybe.java
@@ -14,6 +14,7 @@
 package io.reactivex.rxjava3.core;
 
 import java.util.NoSuchElementException;
+import java.util.Objects;
 import java.util.concurrent.*;
 
 import org.reactivestreams.*;
@@ -127,7 +128,7 @@ public abstract class Maybe<T> implements MaybeSource<T> {
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public static <T> Maybe<T> amb(final Iterable<? extends MaybeSource<? extends T>> sources) {
-        ObjectHelper.requireNonNull(sources, "sources is null");
+        Objects.requireNonNull(sources, "sources is null");
         return RxJavaPlugins.onAssembly(new MaybeAmb<T>(null, sources));
     }
 
@@ -178,7 +179,7 @@ public static <T> Maybe<T> ambArray(final MaybeSource<? extends T>... sources) {
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public static <T> Flowable<T> concat(Iterable<? extends MaybeSource<? extends T>> sources) {
-        ObjectHelper.requireNonNull(sources, "sources is null");
+        Objects.requireNonNull(sources, "sources is null");
         return RxJavaPlugins.onAssembly(new MaybeConcatIterable<T>(sources));
     }
 
@@ -207,8 +208,8 @@ public static <T> Flowable<T> concat(Iterable<? extends MaybeSource<? extends T>
     @SchedulerSupport(SchedulerSupport.NONE)
     @SuppressWarnings("unchecked")
     public static <T> Flowable<T> concat(MaybeSource<? extends T> source1, MaybeSource<? extends T> source2) {
-        ObjectHelper.requireNonNull(source1, "source1 is null");
-        ObjectHelper.requireNonNull(source2, "source2 is null");
+        Objects.requireNonNull(source1, "source1 is null");
+        Objects.requireNonNull(source2, "source2 is null");
         return concatArray(source1, source2);
     }
 
@@ -240,9 +241,9 @@ public static <T> Flowable<T> concat(MaybeSource<? extends T> source1, MaybeSour
     @SuppressWarnings("unchecked")
     public static <T> Flowable<T> concat(
             MaybeSource<? extends T> source1, MaybeSource<? extends T> source2, MaybeSource<? extends T> source3) {
-        ObjectHelper.requireNonNull(source1, "source1 is null");
-        ObjectHelper.requireNonNull(source2, "source2 is null");
-        ObjectHelper.requireNonNull(source3, "source3 is null");
+        Objects.requireNonNull(source1, "source1 is null");
+        Objects.requireNonNull(source2, "source2 is null");
+        Objects.requireNonNull(source3, "source3 is null");
         return concatArray(source1, source2, source3);
     }
 
@@ -276,10 +277,10 @@ public static <T> Flowable<T> concat(
     @SuppressWarnings("unchecked")
     public static <T> Flowable<T> concat(
             MaybeSource<? extends T> source1, MaybeSource<? extends T> source2, MaybeSource<? extends T> source3, MaybeSource<? extends T> source4) {
-        ObjectHelper.requireNonNull(source1, "source1 is null");
-        ObjectHelper.requireNonNull(source2, "source2 is null");
-        ObjectHelper.requireNonNull(source3, "source3 is null");
-        ObjectHelper.requireNonNull(source4, "source4 is null");
+        Objects.requireNonNull(source1, "source1 is null");
+        Objects.requireNonNull(source2, "source2 is null");
+        Objects.requireNonNull(source3, "source3 is null");
+        Objects.requireNonNull(source4, "source4 is null");
         return concatArray(source1, source2, source3, source4);
     }
 
@@ -331,7 +332,7 @@ public static <T> Flowable<T> concat(Publisher<? extends MaybeSource<? extends T
     @SchedulerSupport(SchedulerSupport.NONE)
     @SuppressWarnings({ "unchecked", "rawtypes" })
     public static <T> Flowable<T> concat(Publisher<? extends MaybeSource<? extends T>> sources, int prefetch) {
-        ObjectHelper.requireNonNull(sources, "sources is null");
+        Objects.requireNonNull(sources, "sources is null");
         ObjectHelper.verifyPositive(prefetch, "prefetch");
         return RxJavaPlugins.onAssembly(new FlowableConcatMapPublisher(sources, MaybeToPublisher.instance(), prefetch, ErrorMode.IMMEDIATE));
     }
@@ -356,7 +357,7 @@ public static <T> Flowable<T> concat(Publisher<? extends MaybeSource<? extends T
     @SchedulerSupport(SchedulerSupport.NONE)
     @SuppressWarnings("unchecked")
     public static <T> Flowable<T> concatArray(MaybeSource<? extends T>... sources) {
-        ObjectHelper.requireNonNull(sources, "sources is null");
+        Objects.requireNonNull(sources, "sources is null");
         if (sources.length == 0) {
             return Flowable.empty();
         }
@@ -444,7 +445,7 @@ public static <T> Flowable<T> concatArrayEager(MaybeSource<? extends T>... sourc
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public static <T> Flowable<T> concatDelayError(Iterable<? extends MaybeSource<? extends T>> sources) {
-        ObjectHelper.requireNonNull(sources, "sources is null");
+        Objects.requireNonNull(sources, "sources is null");
         return Flowable.fromIterable(sources).concatMapDelayError((Function)MaybeToPublisher.instance());
     }
 
@@ -574,7 +575,7 @@ public static <T> Flowable<T> concatEager(Publisher<? extends MaybeSource<? exte
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public static <T> Maybe<T> create(MaybeOnSubscribe<T> onSubscribe) {
-        ObjectHelper.requireNonNull(onSubscribe, "onSubscribe is null");
+        Objects.requireNonNull(onSubscribe, "onSubscribe is null");
         return RxJavaPlugins.onAssembly(new MaybeCreate<T>(onSubscribe));
     }
 
@@ -594,7 +595,7 @@ public static <T> Maybe<T> create(MaybeOnSubscribe<T> onSubscribe) {
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public static <T> Maybe<T> defer(final Supplier<? extends MaybeSource<? extends T>> maybeSupplier) {
-        ObjectHelper.requireNonNull(maybeSupplier, "maybeSupplier is null");
+        Objects.requireNonNull(maybeSupplier, "maybeSupplier is null");
         return RxJavaPlugins.onAssembly(new MaybeDefer<T>(maybeSupplier));
     }
 
@@ -639,7 +640,7 @@ public static <T> Maybe<T> empty() {
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public static <T> Maybe<T> error(Throwable exception) {
-        ObjectHelper.requireNonNull(exception, "exception is null");
+        Objects.requireNonNull(exception, "exception is null");
         return RxJavaPlugins.onAssembly(new MaybeError<T>(exception));
     }
 
@@ -665,7 +666,7 @@ public static <T> Maybe<T> error(Throwable exception) {
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public static <T> Maybe<T> error(Supplier<? extends Throwable> supplier) {
-        ObjectHelper.requireNonNull(supplier, "errorSupplier is null");
+        Objects.requireNonNull(supplier, "errorSupplier is null");
         return RxJavaPlugins.onAssembly(new MaybeErrorCallable<T>(supplier));
     }
 
@@ -692,7 +693,7 @@ public static <T> Maybe<T> error(Supplier<? extends Throwable> supplier) {
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public static <T> Maybe<T> fromAction(final Action run) {
-        ObjectHelper.requireNonNull(run, "run is null");
+        Objects.requireNonNull(run, "run is null");
         return RxJavaPlugins.onAssembly(new MaybeFromAction<T>(run));
     }
 
@@ -712,7 +713,7 @@ public static <T> Maybe<T> fromAction(final Action run) {
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public static <T> Maybe<T> fromCompletable(CompletableSource completableSource) {
-        ObjectHelper.requireNonNull(completableSource, "completableSource is null");
+        Objects.requireNonNull(completableSource, "completableSource is null");
         return RxJavaPlugins.onAssembly(new MaybeFromCompletable<T>(completableSource));
     }
 
@@ -732,7 +733,7 @@ public static <T> Maybe<T> fromCompletable(CompletableSource completableSource)
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public static <T> Maybe<T> fromSingle(SingleSource<T> singleSource) {
-        ObjectHelper.requireNonNull(singleSource, "singleSource is null");
+        Objects.requireNonNull(singleSource, "singleSource is null");
         return RxJavaPlugins.onAssembly(new MaybeFromSingle<T>(singleSource));
     }
 
@@ -776,7 +777,7 @@ public static <T> Maybe<T> fromSingle(SingleSource<T> singleSource) {
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public static <T> Maybe<T> fromCallable(@NonNull final Callable<? extends T> callable) {
-        ObjectHelper.requireNonNull(callable, "callable is null");
+        Objects.requireNonNull(callable, "callable is null");
         return RxJavaPlugins.onAssembly(new MaybeFromCallable<T>(callable));
     }
 
@@ -810,7 +811,7 @@ public static <T> Maybe<T> fromCallable(@NonNull final Callable<? extends T> cal
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public static <T> Maybe<T> fromFuture(Future<? extends T> future) {
-        ObjectHelper.requireNonNull(future, "future is null");
+        Objects.requireNonNull(future, "future is null");
         return RxJavaPlugins.onAssembly(new MaybeFromFuture<T>(future, 0L, null));
     }
 
@@ -848,8 +849,8 @@ public static <T> Maybe<T> fromFuture(Future<? extends T> future) {
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public static <T> Maybe<T> fromFuture(Future<? extends T> future, long timeout, TimeUnit unit) {
-        ObjectHelper.requireNonNull(future, "future is null");
-        ObjectHelper.requireNonNull(unit, "unit is null");
+        Objects.requireNonNull(future, "future is null");
+        Objects.requireNonNull(unit, "unit is null");
         return RxJavaPlugins.onAssembly(new MaybeFromFuture<T>(future, timeout, unit));
     }
 
@@ -869,7 +870,7 @@ public static <T> Maybe<T> fromFuture(Future<? extends T> future, long timeout,
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public static <T> Maybe<T> fromRunnable(final Runnable run) {
-        ObjectHelper.requireNonNull(run, "run is null");
+        Objects.requireNonNull(run, "run is null");
         return RxJavaPlugins.onAssembly(new MaybeFromRunnable<T>(run));
     }
 
@@ -916,7 +917,7 @@ public static <T> Maybe<T> fromRunnable(final Runnable run) {
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public static <T> Maybe<T> fromSupplier(@NonNull final Supplier<? extends T> supplier) {
-        ObjectHelper.requireNonNull(supplier, "supplier is null");
+        Objects.requireNonNull(supplier, "supplier is null");
         return RxJavaPlugins.onAssembly(new MaybeFromSupplier<T>(supplier));
     }
 
@@ -943,7 +944,7 @@ public static <T> Maybe<T> fromSupplier(@NonNull final Supplier<? extends T> sup
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public static <T> Maybe<T> just(T item) {
-        ObjectHelper.requireNonNull(item, "item is null");
+        Objects.requireNonNull(item, "item is null");
         return RxJavaPlugins.onAssembly(new MaybeJust<T>(item));
     }
 
@@ -1049,7 +1050,7 @@ public static <T> Flowable<T> merge(Publisher<? extends MaybeSource<? extends T>
     @SchedulerSupport(SchedulerSupport.NONE)
     @SuppressWarnings({ "unchecked", "rawtypes" })
     public static <T> Flowable<T> merge(Publisher<? extends MaybeSource<? extends T>> sources, int maxConcurrency) {
-        ObjectHelper.requireNonNull(sources, "source is null");
+        Objects.requireNonNull(sources, "source is null");
         ObjectHelper.verifyPositive(maxConcurrency, "maxConcurrency");
         return RxJavaPlugins.onAssembly(new FlowableFlatMapPublisher(sources, MaybeToPublisher.instance(), false, maxConcurrency, 1));
     }
@@ -1082,7 +1083,7 @@ public static <T> Flowable<T> merge(Publisher<? extends MaybeSource<? extends T>
     @SchedulerSupport(SchedulerSupport.NONE)
     @SuppressWarnings({ "unchecked", "rawtypes" })
     public static <T> Maybe<T> merge(MaybeSource<? extends MaybeSource<? extends T>> source) {
-        ObjectHelper.requireNonNull(source, "source is null");
+        Objects.requireNonNull(source, "source is null");
         return RxJavaPlugins.onAssembly(new MaybeFlatten(source, Functions.identity()));
     }
 
@@ -1130,8 +1131,8 @@ public static <T> Maybe<T> merge(MaybeSource<? extends MaybeSource<? extends T>>
     public static <T> Flowable<T> merge(
             MaybeSource<? extends T> source1, MaybeSource<? extends T> source2
      ) {
-        ObjectHelper.requireNonNull(source1, "source1 is null");
-        ObjectHelper.requireNonNull(source2, "source2 is null");
+        Objects.requireNonNull(source1, "source1 is null");
+        Objects.requireNonNull(source2, "source2 is null");
         return mergeArray(source1, source2);
     }
 
@@ -1182,9 +1183,9 @@ public static <T> Flowable<T> merge(
             MaybeSource<? extends T> source1, MaybeSource<? extends T> source2,
             MaybeSource<? extends T> source3
      ) {
-        ObjectHelper.requireNonNull(source1, "source1 is null");
-        ObjectHelper.requireNonNull(source2, "source2 is null");
-        ObjectHelper.requireNonNull(source3, "source3 is null");
+        Objects.requireNonNull(source1, "source1 is null");
+        Objects.requireNonNull(source2, "source2 is null");
+        Objects.requireNonNull(source3, "source3 is null");
         return mergeArray(source1, source2, source3);
     }
 
@@ -1237,10 +1238,10 @@ public static <T> Flowable<T> merge(
             MaybeSource<? extends T> source1, MaybeSource<? extends T> source2,
             MaybeSource<? extends T> source3, MaybeSource<? extends T> source4
      ) {
-        ObjectHelper.requireNonNull(source1, "source1 is null");
-        ObjectHelper.requireNonNull(source2, "source2 is null");
-        ObjectHelper.requireNonNull(source3, "source3 is null");
-        ObjectHelper.requireNonNull(source4, "source4 is null");
+        Objects.requireNonNull(source1, "source1 is null");
+        Objects.requireNonNull(source2, "source2 is null");
+        Objects.requireNonNull(source3, "source3 is null");
+        Objects.requireNonNull(source4, "source4 is null");
         return mergeArray(source1, source2, source3, source4);
     }
 
@@ -1277,7 +1278,7 @@ public static <T> Flowable<T> merge(
     @SchedulerSupport(SchedulerSupport.NONE)
     @SuppressWarnings("unchecked")
     public static <T> Flowable<T> mergeArray(MaybeSource<? extends T>... sources) {
-        ObjectHelper.requireNonNull(sources, "sources is null");
+        Objects.requireNonNull(sources, "sources is null");
         if (sources.length == 0) {
             return Flowable.empty();
         }
@@ -1431,7 +1432,7 @@ public static <T> Flowable<T> mergeDelayError(Publisher<? extends MaybeSource<?
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public static <T> Flowable<T> mergeDelayError(Publisher<? extends MaybeSource<? extends T>> sources, int maxConcurrency) {
-        ObjectHelper.requireNonNull(sources, "source is null");
+        Objects.requireNonNull(sources, "source is null");
         ObjectHelper.verifyPositive(maxConcurrency, "maxConcurrency");
         return RxJavaPlugins.onAssembly(new FlowableFlatMapPublisher(sources, MaybeToPublisher.instance(), true, maxConcurrency, 1));
     }
@@ -1470,8 +1471,8 @@ public static <T> Flowable<T> mergeDelayError(Publisher<? extends MaybeSource<?
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public static <T> Flowable<T> mergeDelayError(MaybeSource<? extends T> source1, MaybeSource<? extends T> source2) {
-        ObjectHelper.requireNonNull(source1, "source1 is null");
-        ObjectHelper.requireNonNull(source2, "source2 is null");
+        Objects.requireNonNull(source1, "source1 is null");
+        Objects.requireNonNull(source2, "source2 is null");
         return mergeArrayDelayError(source1, source2);
     }
 
@@ -1513,9 +1514,9 @@ public static <T> Flowable<T> mergeDelayError(MaybeSource<? extends T> source1,
     @SchedulerSupport(SchedulerSupport.NONE)
     public static <T> Flowable<T> mergeDelayError(MaybeSource<? extends T> source1,
             MaybeSource<? extends T> source2, MaybeSource<? extends T> source3) {
-        ObjectHelper.requireNonNull(source1, "source1 is null");
-        ObjectHelper.requireNonNull(source2, "source2 is null");
-        ObjectHelper.requireNonNull(source3, "source3 is null");
+        Objects.requireNonNull(source1, "source1 is null");
+        Objects.requireNonNull(source2, "source2 is null");
+        Objects.requireNonNull(source3, "source3 is null");
         return mergeArrayDelayError(source1, source2, source3);
     }
 
@@ -1560,10 +1561,10 @@ public static <T> Flowable<T> mergeDelayError(MaybeSource<? extends T> source1,
     public static <T> Flowable<T> mergeDelayError(
             MaybeSource<? extends T> source1, MaybeSource<? extends T> source2,
             MaybeSource<? extends T> source3, MaybeSource<? extends T> source4) {
-        ObjectHelper.requireNonNull(source1, "source1 is null");
-        ObjectHelper.requireNonNull(source2, "source2 is null");
-        ObjectHelper.requireNonNull(source3, "source3 is null");
-        ObjectHelper.requireNonNull(source4, "source4 is null");
+        Objects.requireNonNull(source1, "source1 is null");
+        Objects.requireNonNull(source2, "source2 is null");
+        Objects.requireNonNull(source3, "source3 is null");
+        Objects.requireNonNull(source4, "source4 is null");
         return mergeArrayDelayError(source1, source2, source3, source4);
     }
 
@@ -1643,9 +1644,9 @@ public static <T> Single<Boolean> sequenceEqual(MaybeSource<? extends T> source1
     @SchedulerSupport(SchedulerSupport.NONE)
     public static <T> Single<Boolean> sequenceEqual(MaybeSource<? extends T> source1, MaybeSource<? extends T> source2,
             BiPredicate<? super T, ? super T> isEqual) {
-        ObjectHelper.requireNonNull(source1, "source1 is null");
-        ObjectHelper.requireNonNull(source2, "source2 is null");
-        ObjectHelper.requireNonNull(isEqual, "isEqual is null");
+        Objects.requireNonNull(source1, "source1 is null");
+        Objects.requireNonNull(source2, "source2 is null");
+        Objects.requireNonNull(isEqual, "isEqual is null");
         return RxJavaPlugins.onAssembly(new MaybeEqualSingle<T>(source1, source2, isEqual));
     }
 
@@ -1693,8 +1694,8 @@ public static Maybe<Long> timer(long delay, TimeUnit unit) {
     @NonNull
     @SchedulerSupport(SchedulerSupport.CUSTOM)
     public static Maybe<Long> timer(long delay, TimeUnit unit, Scheduler scheduler) {
-        ObjectHelper.requireNonNull(unit, "unit is null");
-        ObjectHelper.requireNonNull(scheduler, "scheduler is null");
+        Objects.requireNonNull(unit, "unit is null");
+        Objects.requireNonNull(scheduler, "scheduler is null");
 
         return RxJavaPlugins.onAssembly(new MaybeTimer(Math.max(0L, delay), unit, scheduler));
     }
@@ -1717,7 +1718,7 @@ public static <T> Maybe<T> unsafeCreate(MaybeSource<T> onSubscribe) {
         if (onSubscribe instanceof Maybe) {
             throw new IllegalArgumentException("unsafeCreate(Maybe) should be upgraded");
         }
-        ObjectHelper.requireNonNull(onSubscribe, "onSubscribe is null");
+        Objects.requireNonNull(onSubscribe, "onSubscribe is null");
         return RxJavaPlugins.onAssembly(new MaybeUnsafeCreate<T>(onSubscribe));
     }
 
@@ -1785,9 +1786,9 @@ public static <T, D> Maybe<T> using(Supplier<? extends D> resourceSupplier,
     public static <T, D> Maybe<T> using(Supplier<? extends D> resourceSupplier,
             Function<? super D, ? extends MaybeSource<? extends T>> sourceSupplier,
                     Consumer<? super D> resourceDisposer, boolean eager) {
-        ObjectHelper.requireNonNull(resourceSupplier, "resourceSupplier is null");
-        ObjectHelper.requireNonNull(sourceSupplier, "sourceSupplier is null");
-        ObjectHelper.requireNonNull(resourceDisposer, "disposer is null");
+        Objects.requireNonNull(resourceSupplier, "resourceSupplier is null");
+        Objects.requireNonNull(sourceSupplier, "sourceSupplier is null");
+        Objects.requireNonNull(resourceDisposer, "disposer is null");
         return RxJavaPlugins.onAssembly(new MaybeUsing<T, D>(resourceSupplier, sourceSupplier, resourceDisposer, eager));
     }
 
@@ -1809,7 +1810,7 @@ public static <T> Maybe<T> wrap(MaybeSource<T> source) {
         if (source instanceof Maybe) {
             return RxJavaPlugins.onAssembly((Maybe<T>)source);
         }
-        ObjectHelper.requireNonNull(source, "onSubscribe is null");
+        Objects.requireNonNull(source, "onSubscribe is null");
         return RxJavaPlugins.onAssembly(new MaybeUnsafeCreate<T>(source));
     }
 
@@ -1844,8 +1845,8 @@ public static <T> Maybe<T> wrap(MaybeSource<T> source) {
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public static <T, R> Maybe<R> zip(Iterable<? extends MaybeSource<? extends T>> sources, Function<? super Object[], ? extends R> zipper) {
-        ObjectHelper.requireNonNull(zipper, "zipper is null");
-        ObjectHelper.requireNonNull(sources, "sources is null");
+        Objects.requireNonNull(zipper, "zipper is null");
+        Objects.requireNonNull(sources, "sources is null");
         return RxJavaPlugins.onAssembly(new MaybeZipIterable<T, R>(sources, zipper));
     }
 
@@ -1882,8 +1883,8 @@ public static <T, R> Maybe<R> zip(Iterable<? extends MaybeSource<? extends T>> s
     public static <T1, T2, R> Maybe<R> zip(
             MaybeSource<? extends T1> source1, MaybeSource<? extends T2> source2,
             BiFunction<? super T1, ? super T2, ? extends R> zipper) {
-        ObjectHelper.requireNonNull(source1, "source1 is null");
-        ObjectHelper.requireNonNull(source2, "source2 is null");
+        Objects.requireNonNull(source1, "source1 is null");
+        Objects.requireNonNull(source2, "source2 is null");
         return zipArray(Functions.toFunction(zipper), source1, source2);
     }
 
@@ -1923,9 +1924,9 @@ public static <T1, T2, R> Maybe<R> zip(
     public static <T1, T2, T3, R> Maybe<R> zip(
             MaybeSource<? extends T1> source1, MaybeSource<? extends T2> source2, MaybeSource<? extends T3> source3,
             Function3<? super T1, ? super T2, ? super T3, ? extends R> zipper) {
-        ObjectHelper.requireNonNull(source1, "source1 is null");
-        ObjectHelper.requireNonNull(source2, "source2 is null");
-        ObjectHelper.requireNonNull(source3, "source3 is null");
+        Objects.requireNonNull(source1, "source1 is null");
+        Objects.requireNonNull(source2, "source2 is null");
+        Objects.requireNonNull(source3, "source3 is null");
         return zipArray(Functions.toFunction(zipper), source1, source2, source3);
     }
 
@@ -1969,10 +1970,10 @@ public static <T1, T2, T3, T4, R> Maybe<R> zip(
             MaybeSource<? extends T1> source1, MaybeSource<? extends T2> source2, MaybeSource<? extends T3> source3,
             MaybeSource<? extends T4> source4,
             Function4<? super T1, ? super T2, ? super T3, ? super T4, ? extends R> zipper) {
-        ObjectHelper.requireNonNull(source1, "source1 is null");
-        ObjectHelper.requireNonNull(source2, "source2 is null");
-        ObjectHelper.requireNonNull(source3, "source3 is null");
-        ObjectHelper.requireNonNull(source4, "source4 is null");
+        Objects.requireNonNull(source1, "source1 is null");
+        Objects.requireNonNull(source2, "source2 is null");
+        Objects.requireNonNull(source3, "source3 is null");
+        Objects.requireNonNull(source4, "source4 is null");
         return zipArray(Functions.toFunction(zipper), source1, source2, source3, source4);
     }
 
@@ -2019,11 +2020,11 @@ public static <T1, T2, T3, T4, T5, R> Maybe<R> zip(
             MaybeSource<? extends T1> source1, MaybeSource<? extends T2> source2, MaybeSource<? extends T3> source3,
             MaybeSource<? extends T4> source4, MaybeSource<? extends T5> source5,
             Function5<? super T1, ? super T2, ? super T3, ? super T4, ? super T5, ? extends R> zipper) {
-        ObjectHelper.requireNonNull(source1, "source1 is null");
-        ObjectHelper.requireNonNull(source2, "source2 is null");
-        ObjectHelper.requireNonNull(source3, "source3 is null");
-        ObjectHelper.requireNonNull(source4, "source4 is null");
-        ObjectHelper.requireNonNull(source5, "source5 is null");
+        Objects.requireNonNull(source1, "source1 is null");
+        Objects.requireNonNull(source2, "source2 is null");
+        Objects.requireNonNull(source3, "source3 is null");
+        Objects.requireNonNull(source4, "source4 is null");
+        Objects.requireNonNull(source5, "source5 is null");
         return zipArray(Functions.toFunction(zipper), source1, source2, source3, source4, source5);
     }
 
@@ -2073,12 +2074,12 @@ public static <T1, T2, T3, T4, T5, T6, R> Maybe<R> zip(
             MaybeSource<? extends T1> source1, MaybeSource<? extends T2> source2, MaybeSource<? extends T3> source3,
             MaybeSource<? extends T4> source4, MaybeSource<? extends T5> source5, MaybeSource<? extends T6> source6,
             Function6<? super T1, ? super T2, ? super T3, ? super T4, ? super T5, ? super T6, ? extends R> zipper) {
-        ObjectHelper.requireNonNull(source1, "source1 is null");
-        ObjectHelper.requireNonNull(source2, "source2 is null");
-        ObjectHelper.requireNonNull(source3, "source3 is null");
-        ObjectHelper.requireNonNull(source4, "source4 is null");
-        ObjectHelper.requireNonNull(source5, "source5 is null");
-        ObjectHelper.requireNonNull(source6, "source6 is null");
+        Objects.requireNonNull(source1, "source1 is null");
+        Objects.requireNonNull(source2, "source2 is null");
+        Objects.requireNonNull(source3, "source3 is null");
+        Objects.requireNonNull(source4, "source4 is null");
+        Objects.requireNonNull(source5, "source5 is null");
+        Objects.requireNonNull(source6, "source6 is null");
         return zipArray(Functions.toFunction(zipper), source1, source2, source3, source4, source5, source6);
     }
 
@@ -2132,13 +2133,13 @@ public static <T1, T2, T3, T4, T5, T6, T7, R> Maybe<R> zip(
             MaybeSource<? extends T4> source4, MaybeSource<? extends T5> source5, MaybeSource<? extends T6> source6,
             MaybeSource<? extends T7> source7,
             Function7<? super T1, ? super T2, ? super T3, ? super T4, ? super T5, ? super T6, ? super T7, ? extends R> zipper) {
-        ObjectHelper.requireNonNull(source1, "source1 is null");
-        ObjectHelper.requireNonNull(source2, "source2 is null");
-        ObjectHelper.requireNonNull(source3, "source3 is null");
-        ObjectHelper.requireNonNull(source4, "source4 is null");
-        ObjectHelper.requireNonNull(source5, "source5 is null");
-        ObjectHelper.requireNonNull(source6, "source6 is null");
-        ObjectHelper.requireNonNull(source7, "source7 is null");
+        Objects.requireNonNull(source1, "source1 is null");
+        Objects.requireNonNull(source2, "source2 is null");
+        Objects.requireNonNull(source3, "source3 is null");
+        Objects.requireNonNull(source4, "source4 is null");
+        Objects.requireNonNull(source5, "source5 is null");
+        Objects.requireNonNull(source6, "source6 is null");
+        Objects.requireNonNull(source7, "source7 is null");
         return zipArray(Functions.toFunction(zipper), source1, source2, source3, source4, source5, source6, source7);
     }
 
@@ -2195,14 +2196,14 @@ public static <T1, T2, T3, T4, T5, T6, T7, T8, R> Maybe<R> zip(
             MaybeSource<? extends T4> source4, MaybeSource<? extends T5> source5, MaybeSource<? extends T6> source6,
             MaybeSource<? extends T7> source7, MaybeSource<? extends T8> source8,
             Function8<? super T1, ? super T2, ? super T3, ? super T4, ? super T5, ? super T6, ? super T7, ? super T8, ? extends R> zipper) {
-        ObjectHelper.requireNonNull(source1, "source1 is null");
-        ObjectHelper.requireNonNull(source2, "source2 is null");
-        ObjectHelper.requireNonNull(source3, "source3 is null");
-        ObjectHelper.requireNonNull(source4, "source4 is null");
-        ObjectHelper.requireNonNull(source5, "source5 is null");
-        ObjectHelper.requireNonNull(source6, "source6 is null");
-        ObjectHelper.requireNonNull(source7, "source7 is null");
-        ObjectHelper.requireNonNull(source8, "source8 is null");
+        Objects.requireNonNull(source1, "source1 is null");
+        Objects.requireNonNull(source2, "source2 is null");
+        Objects.requireNonNull(source3, "source3 is null");
+        Objects.requireNonNull(source4, "source4 is null");
+        Objects.requireNonNull(source5, "source5 is null");
+        Objects.requireNonNull(source6, "source6 is null");
+        Objects.requireNonNull(source7, "source7 is null");
+        Objects.requireNonNull(source8, "source8 is null");
         return zipArray(Functions.toFunction(zipper), source1, source2, source3, source4, source5, source6, source7, source8);
     }
 
@@ -2262,15 +2263,15 @@ public static <T1, T2, T3, T4, T5, T6, T7, T8, T9, R> Maybe<R> zip(
             MaybeSource<? extends T7> source7, MaybeSource<? extends T8> source8, MaybeSource<? extends T9> source9,
             Function9<? super T1, ? super T2, ? super T3, ? super T4, ? super T5, ? super T6, ? super T7, ? super T8, ? super T9, ? extends R> zipper) {
 
-        ObjectHelper.requireNonNull(source1, "source1 is null");
-        ObjectHelper.requireNonNull(source2, "source2 is null");
-        ObjectHelper.requireNonNull(source3, "source3 is null");
-        ObjectHelper.requireNonNull(source4, "source4 is null");
-        ObjectHelper.requireNonNull(source5, "source5 is null");
-        ObjectHelper.requireNonNull(source6, "source6 is null");
-        ObjectHelper.requireNonNull(source7, "source7 is null");
-        ObjectHelper.requireNonNull(source8, "source8 is null");
-        ObjectHelper.requireNonNull(source9, "source9 is null");
+        Objects.requireNonNull(source1, "source1 is null");
+        Objects.requireNonNull(source2, "source2 is null");
+        Objects.requireNonNull(source3, "source3 is null");
+        Objects.requireNonNull(source4, "source4 is null");
+        Objects.requireNonNull(source5, "source5 is null");
+        Objects.requireNonNull(source6, "source6 is null");
+        Objects.requireNonNull(source7, "source7 is null");
+        Objects.requireNonNull(source8, "source8 is null");
+        Objects.requireNonNull(source9, "source9 is null");
         return zipArray(Functions.toFunction(zipper), source1, source2, source3, source4, source5, source6, source7, source8, source9);
     }
 
@@ -2306,11 +2307,11 @@ public static <T1, T2, T3, T4, T5, T6, T7, T8, T9, R> Maybe<R> zip(
     @SchedulerSupport(SchedulerSupport.NONE)
     public static <T, R> Maybe<R> zipArray(Function<? super Object[], ? extends R> zipper,
             MaybeSource<? extends T>... sources) {
-        ObjectHelper.requireNonNull(sources, "sources is null");
+        Objects.requireNonNull(sources, "sources is null");
         if (sources.length == 0) {
             return empty();
         }
-        ObjectHelper.requireNonNull(zipper, "zipper is null");
+        Objects.requireNonNull(zipper, "zipper is null");
         return RxJavaPlugins.onAssembly(new MaybeZipArray<T, R>(sources, zipper));
     }
 
@@ -2339,7 +2340,7 @@ public static <T, R> Maybe<R> zipArray(Function<? super Object[], ? extends R> z
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Maybe<T> ambWith(MaybeSource<? extends T> other) {
-        ObjectHelper.requireNonNull(other, "other is null");
+        Objects.requireNonNull(other, "other is null");
         return ambArray(this, other);
     }
 
@@ -2381,7 +2382,7 @@ public final T blockingGet() {
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.NONE)
     public final T blockingGet(T defaultValue) {
-        ObjectHelper.requireNonNull(defaultValue, "defaultValue is null");
+        Objects.requireNonNull(defaultValue, "defaultValue is null");
         BlockingMultiObserver<T> observer = new BlockingMultiObserver<T>();
         subscribe(observer);
         return observer.blockingGet(defaultValue);
@@ -2429,7 +2430,7 @@ public final Maybe<T> cache() {
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <U> Maybe<U> cast(final Class<? extends U> clazz) {
-        ObjectHelper.requireNonNull(clazz, "clazz is null");
+        Objects.requireNonNull(clazz, "clazz is null");
         return map(Functions.castFunction(clazz));
     }
 
@@ -2455,7 +2456,7 @@ public final <U> Maybe<U> cast(final Class<? extends U> clazz) {
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <R> Maybe<R> compose(MaybeTransformer<? super T, ? extends R> transformer) {
-        return wrap(((MaybeTransformer<T, R>) ObjectHelper.requireNonNull(transformer, "transformer is null")).apply(this));
+        return wrap(((MaybeTransformer<T, R>) Objects.requireNonNull(transformer, "transformer is null")).apply(this));
     }
 
     /**
@@ -2478,7 +2479,7 @@ public final <R> Maybe<R> compose(MaybeTransformer<? super T, ? extends R> trans
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <R> Maybe<R> concatMap(Function<? super T, ? extends MaybeSource<? extends R>> mapper) {
-        ObjectHelper.requireNonNull(mapper, "mapper is null");
+        Objects.requireNonNull(mapper, "mapper is null");
         return RxJavaPlugins.onAssembly(new MaybeFlatten<T, R>(this, mapper));
     }
 
@@ -2505,7 +2506,7 @@ public final <R> Maybe<R> concatMap(Function<? super T, ? extends MaybeSource<?
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Flowable<T> concatWith(MaybeSource<? extends T> other) {
-        ObjectHelper.requireNonNull(other, "other is null");
+        Objects.requireNonNull(other, "other is null");
         return concat(this, other);
     }
 
@@ -2529,7 +2530,7 @@ public final Flowable<T> concatWith(MaybeSource<? extends T> other) {
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Single<Boolean> contains(final Object item) {
-        ObjectHelper.requireNonNull(item, "item is null");
+        Objects.requireNonNull(item, "item is null");
         return RxJavaPlugins.onAssembly(new MaybeContains<T>(this, item));
     }
 
@@ -2573,7 +2574,7 @@ public final Single<Long> count() {
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Single<T> defaultIfEmpty(T defaultItem) {
-        ObjectHelper.requireNonNull(defaultItem, "defaultItem is null");
+        Objects.requireNonNull(defaultItem, "defaultItem is null");
         return RxJavaPlugins.onAssembly(new MaybeToSingle<T>(this, defaultItem));
     }
 
@@ -2624,8 +2625,8 @@ public final Maybe<T> delay(long delay, TimeUnit unit) {
     @NonNull
     @SchedulerSupport(SchedulerSupport.CUSTOM)
     public final Maybe<T> delay(long delay, TimeUnit unit, Scheduler scheduler) {
-        ObjectHelper.requireNonNull(unit, "unit is null");
-        ObjectHelper.requireNonNull(scheduler, "scheduler is null");
+        Objects.requireNonNull(unit, "unit is null");
+        Objects.requireNonNull(scheduler, "scheduler is null");
         return RxJavaPlugins.onAssembly(new MaybeDelay<T>(this, Math.max(0L, delay), unit, scheduler));
     }
 
@@ -2656,7 +2657,7 @@ public final Maybe<T> delay(long delay, TimeUnit unit, Scheduler scheduler) {
     @SchedulerSupport(SchedulerSupport.NONE)
     @BackpressureSupport(BackpressureKind.UNBOUNDED_IN)
     public final <U, V> Maybe<T> delay(Publisher<U> delayIndicator) {
-        ObjectHelper.requireNonNull(delayIndicator, "delayIndicator is null");
+        Objects.requireNonNull(delayIndicator, "delayIndicator is null");
         return RxJavaPlugins.onAssembly(new MaybeDelayOtherPublisher<T, U>(this, delayIndicator));
     }
 
@@ -2683,7 +2684,7 @@ public final <U, V> Maybe<T> delay(Publisher<U> delayIndicator) {
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <U> Maybe<T> delaySubscription(Publisher<U> subscriptionIndicator) {
-        ObjectHelper.requireNonNull(subscriptionIndicator, "subscriptionIndicator is null");
+        Objects.requireNonNull(subscriptionIndicator, "subscriptionIndicator is null");
         return RxJavaPlugins.onAssembly(new MaybeDelaySubscriptionOtherPublisher<T, U>(this, subscriptionIndicator));
     }
 
@@ -2753,7 +2754,7 @@ public final Maybe<T> delaySubscription(long delay, TimeUnit unit, Scheduler sch
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Maybe<T> doAfterSuccess(Consumer<? super T> onAfterSuccess) {
-        ObjectHelper.requireNonNull(onAfterSuccess, "onAfterSuccess is null");
+        Objects.requireNonNull(onAfterSuccess, "onAfterSuccess is null");
         return RxJavaPlugins.onAssembly(new MaybeDoAfterSuccess<T>(this, onAfterSuccess));
     }
 
@@ -2783,7 +2784,7 @@ public final Maybe<T> doAfterTerminate(Action onAfterTerminate) {
                 Functions.emptyConsumer(), // onSuccess
                 Functions.emptyConsumer(), // onError
                 Functions.EMPTY_ACTION,    // onComplete
-                ObjectHelper.requireNonNull(onAfterTerminate, "onAfterTerminate is null"),
+                Objects.requireNonNull(onAfterTerminate, "onAfterTerminate is null"),
                 Functions.EMPTY_ACTION     // dispose
         ));
     }
@@ -2808,7 +2809,7 @@ public final Maybe<T> doAfterTerminate(Action onAfterTerminate) {
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Maybe<T> doFinally(Action onFinally) {
-        ObjectHelper.requireNonNull(onFinally, "onFinally is null");
+        Objects.requireNonNull(onFinally, "onFinally is null");
         return RxJavaPlugins.onAssembly(new MaybeDoFinally<T>(this, onFinally));
     }
 
@@ -2833,7 +2834,7 @@ public final Maybe<T> doOnDispose(Action onDispose) {
                 Functions.emptyConsumer(), // onError
                 Functions.EMPTY_ACTION,    // onComplete
                 Functions.EMPTY_ACTION,    // (onSuccess | onError | onComplete) after
-                ObjectHelper.requireNonNull(onDispose, "onDispose is null")
+                Objects.requireNonNull(onDispose, "onDispose is null")
         ));
     }
 
@@ -2859,7 +2860,7 @@ public final Maybe<T> doOnComplete(Action onComplete) {
                 Functions.emptyConsumer(), // onSubscribe
                 Functions.emptyConsumer(), // onSuccess
                 Functions.emptyConsumer(), // onError
-                ObjectHelper.requireNonNull(onComplete, "onComplete is null"),
+                Objects.requireNonNull(onComplete, "onComplete is null"),
                 Functions.EMPTY_ACTION,    // (onSuccess | onError | onComplete)
                 Functions.EMPTY_ACTION     // dispose
         ));
@@ -2884,7 +2885,7 @@ public final Maybe<T> doOnError(Consumer<? super Throwable> onError) {
         return RxJavaPlugins.onAssembly(new MaybePeek<T>(this,
                 Functions.emptyConsumer(), // onSubscribe
                 Functions.emptyConsumer(), // onSuccess
-                ObjectHelper.requireNonNull(onError, "onError is null"),
+                Objects.requireNonNull(onError, "onError is null"),
                 Functions.EMPTY_ACTION,    // onComplete
                 Functions.EMPTY_ACTION,    // (onSuccess | onError | onComplete)
                 Functions.EMPTY_ACTION     // dispose
@@ -2910,7 +2911,7 @@ public final Maybe<T> doOnError(Consumer<? super Throwable> onError) {
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Maybe<T> doOnEvent(BiConsumer<? super T, ? super Throwable> onEvent) {
-        ObjectHelper.requireNonNull(onEvent, "onEvent is null");
+        Objects.requireNonNull(onEvent, "onEvent is null");
         return RxJavaPlugins.onAssembly(new MaybeDoOnEvent<T>(this, onEvent));
     }
 
@@ -2929,7 +2930,7 @@ public final Maybe<T> doOnEvent(BiConsumer<? super T, ? super Throwable> onEvent
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Maybe<T> doOnSubscribe(Consumer<? super Disposable> onSubscribe) {
         return RxJavaPlugins.onAssembly(new MaybePeek<T>(this,
-                ObjectHelper.requireNonNull(onSubscribe, "onSubscribe is null"),
+                Objects.requireNonNull(onSubscribe, "onSubscribe is null"),
                 Functions.emptyConsumer(), // onSuccess
                 Functions.emptyConsumer(), // onError
                 Functions.EMPTY_ACTION,    // onComplete
@@ -2961,7 +2962,7 @@ public final Maybe<T> doOnSubscribe(Consumer<? super Disposable> onSubscribe) {
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Maybe<T> doOnTerminate(final Action onTerminate) {
-        ObjectHelper.requireNonNull(onTerminate, "onTerminate is null");
+        Objects.requireNonNull(onTerminate, "onTerminate is null");
         return RxJavaPlugins.onAssembly(new MaybeDoOnTerminate<T>(this, onTerminate));
     }
 
@@ -2983,7 +2984,7 @@ public final Maybe<T> doOnTerminate(final Action onTerminate) {
     public final Maybe<T> doOnSuccess(Consumer<? super T> onSuccess) {
         return RxJavaPlugins.onAssembly(new MaybePeek<T>(this,
                 Functions.emptyConsumer(), // onSubscribe
-                ObjectHelper.requireNonNull(onSuccess, "onSuccess is null"),
+                Objects.requireNonNull(onSuccess, "onSuccess is null"),
                 Functions.emptyConsumer(), // onError
                 Functions.EMPTY_ACTION,    // onComplete
                 Functions.EMPTY_ACTION,    // (onSuccess | onError | onComplete)
@@ -3012,7 +3013,7 @@ public final Maybe<T> doOnSuccess(Consumer<? super T> onSuccess) {
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Maybe<T> filter(Predicate<? super T> predicate) {
-        ObjectHelper.requireNonNull(predicate, "predicate is null");
+        Objects.requireNonNull(predicate, "predicate is null");
         return RxJavaPlugins.onAssembly(new MaybeFilter<T>(this, predicate));
     }
 
@@ -3037,7 +3038,7 @@ public final Maybe<T> filter(Predicate<? super T> predicate) {
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <R> Maybe<R> flatMap(Function<? super T, ? extends MaybeSource<? extends R>> mapper) {
-        ObjectHelper.requireNonNull(mapper, "mapper is null");
+        Objects.requireNonNull(mapper, "mapper is null");
         return RxJavaPlugins.onAssembly(new MaybeFlatten<T, R>(this, mapper));
     }
 
@@ -3069,9 +3070,9 @@ public final <R> Maybe<R> flatMap(
             Function<? super T, ? extends MaybeSource<? extends R>> onSuccessMapper,
             Function<? super Throwable, ? extends MaybeSource<? extends R>> onErrorMapper,
             Supplier<? extends MaybeSource<? extends R>> onCompleteSupplier) {
-        ObjectHelper.requireNonNull(onSuccessMapper, "onSuccessMapper is null");
-        ObjectHelper.requireNonNull(onErrorMapper, "onErrorMapper is null");
-        ObjectHelper.requireNonNull(onCompleteSupplier, "onCompleteSupplier is null");
+        Objects.requireNonNull(onSuccessMapper, "onSuccessMapper is null");
+        Objects.requireNonNull(onErrorMapper, "onErrorMapper is null");
+        Objects.requireNonNull(onCompleteSupplier, "onCompleteSupplier is null");
         return RxJavaPlugins.onAssembly(new MaybeFlatMapNotification<T, R>(this, onSuccessMapper, onErrorMapper, onCompleteSupplier));
     }
 
@@ -3102,8 +3103,8 @@ public final <R> Maybe<R> flatMap(
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <U, R> Maybe<R> flatMap(Function<? super T, ? extends MaybeSource<? extends U>> mapper,
             BiFunction<? super T, ? super U, ? extends R> resultSelector) {
-        ObjectHelper.requireNonNull(mapper, "mapper is null");
-        ObjectHelper.requireNonNull(resultSelector, "resultSelector is null");
+        Objects.requireNonNull(mapper, "mapper is null");
+        Objects.requireNonNull(resultSelector, "resultSelector is null");
         return RxJavaPlugins.onAssembly(new MaybeFlatMapBiSelector<T, U, R>(this, mapper, resultSelector));
     }
 
@@ -3132,7 +3133,7 @@ public final <U, R> Maybe<R> flatMap(Function<? super T, ? extends MaybeSource<?
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <U> Flowable<U> flattenAsFlowable(final Function<? super T, ? extends Iterable<? extends U>> mapper) {
-        ObjectHelper.requireNonNull(mapper, "mapper is null");
+        Objects.requireNonNull(mapper, "mapper is null");
         return RxJavaPlugins.onAssembly(new MaybeFlatMapIterableFlowable<T, U>(this, mapper));
     }
 
@@ -3158,7 +3159,7 @@ public final <U> Flowable<U> flattenAsFlowable(final Function<? super T, ? exten
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <U> Observable<U> flattenAsObservable(final Function<? super T, ? extends Iterable<? extends U>> mapper) {
-        ObjectHelper.requireNonNull(mapper, "mapper is null");
+        Objects.requireNonNull(mapper, "mapper is null");
         return RxJavaPlugins.onAssembly(new MaybeFlatMapIterableObservable<T, U>(this, mapper));
     }
 
@@ -3182,7 +3183,7 @@ public final <U> Observable<U> flattenAsObservable(final Function<? super T, ? e
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <R> Observable<R> flatMapObservable(Function<? super T, ? extends ObservableSource<? extends R>> mapper) {
-        ObjectHelper.requireNonNull(mapper, "mapper is null");
+        Objects.requireNonNull(mapper, "mapper is null");
         return RxJavaPlugins.onAssembly(new MaybeFlatMapObservable<T, R>(this, mapper));
     }
 
@@ -3210,7 +3211,7 @@ public final <R> Observable<R> flatMapObservable(Function<? super T, ? extends O
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <R> Flowable<R> flatMapPublisher(Function<? super T, ? extends Publisher<? extends R>> mapper) {
-        ObjectHelper.requireNonNull(mapper, "mapper is null");
+        Objects.requireNonNull(mapper, "mapper is null");
         return RxJavaPlugins.onAssembly(new MaybeFlatMapPublisher<T, R>(this, mapper));
     }
 
@@ -3236,7 +3237,7 @@ public final <R> Flowable<R> flatMapPublisher(Function<? super T, ? extends Publ
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <R> Single<R> flatMapSingle(final Function<? super T, ? extends SingleSource<? extends R>> mapper) {
-        ObjectHelper.requireNonNull(mapper, "mapper is null");
+        Objects.requireNonNull(mapper, "mapper is null");
         return RxJavaPlugins.onAssembly(new MaybeFlatMapSingle<T, R>(this, mapper));
     }
 
@@ -3264,7 +3265,7 @@ public final <R> Single<R> flatMapSingle(final Function<? super T, ? extends Sin
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <R> Maybe<R> flatMapSingleElement(final Function<? super T, ? extends SingleSource<? extends R>> mapper) {
-        ObjectHelper.requireNonNull(mapper, "mapper is null");
+        Objects.requireNonNull(mapper, "mapper is null");
         return RxJavaPlugins.onAssembly(new MaybeFlatMapSingleElement<T, R>(this, mapper));
     }
 
@@ -3288,7 +3289,7 @@ public final <R> Maybe<R> flatMapSingleElement(final Function<? super T, ? exten
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Completable flatMapCompletable(final Function<? super T, ? extends CompletableSource> mapper) {
-        ObjectHelper.requireNonNull(mapper, "mapper is null");
+        Objects.requireNonNull(mapper, "mapper is null");
         return RxJavaPlugins.onAssembly(new MaybeFlatMapCompletable<T>(this, mapper));
     }
 
@@ -3500,7 +3501,7 @@ public final Single<Boolean> isEmpty() {
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <R> Maybe<R> lift(final MaybeOperator<? extends R, ? super T> lift) {
-        ObjectHelper.requireNonNull(lift, "lift is null");
+        Objects.requireNonNull(lift, "lift is null");
         return RxJavaPlugins.onAssembly(new MaybeLift<T, R>(this, lift));
     }
 
@@ -3524,7 +3525,7 @@ public final <R> Maybe<R> lift(final MaybeOperator<? extends R, ? super T> lift)
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <R> Maybe<R> map(Function<? super T, ? extends R> mapper) {
-        ObjectHelper.requireNonNull(mapper, "mapper is null");
+        Objects.requireNonNull(mapper, "mapper is null");
         return RxJavaPlugins.onAssembly(new MaybeMap<T, R>(this, mapper));
     }
 
@@ -3572,7 +3573,7 @@ public final Single<Notification<T>> materialize() {
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Flowable<T> mergeWith(MaybeSource<? extends T> other) {
-        ObjectHelper.requireNonNull(other, "other is null");
+        Objects.requireNonNull(other, "other is null");
         return merge(this, other);
     }
 
@@ -3598,7 +3599,7 @@ public final Flowable<T> mergeWith(MaybeSource<? extends T> other) {
     @NonNull
     @SchedulerSupport(SchedulerSupport.CUSTOM)
     public final Maybe<T> observeOn(final Scheduler scheduler) {
-        ObjectHelper.requireNonNull(scheduler, "scheduler is null");
+        Objects.requireNonNull(scheduler, "scheduler is null");
         return RxJavaPlugins.onAssembly(new MaybeObserveOn<T>(this, scheduler));
     }
 
@@ -3622,7 +3623,7 @@ public final Maybe<T> observeOn(final Scheduler scheduler) {
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <U> Maybe<U> ofType(final Class<U> clazz) {
-        ObjectHelper.requireNonNull(clazz, "clazz is null");
+        Objects.requireNonNull(clazz, "clazz is null");
         return filter(Functions.isInstanceOf(clazz)).cast(clazz);
     }
 
@@ -3644,7 +3645,7 @@ public final <U> Maybe<U> ofType(final Class<U> clazz) {
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <R> R to(@NonNull MaybeConverter<T, ? extends R> converter) {
-        return ObjectHelper.requireNonNull(converter, "converter is null").apply(this);
+        return Objects.requireNonNull(converter, "converter is null").apply(this);
     }
 
     /**
@@ -3733,7 +3734,7 @@ public final Maybe<T> onErrorComplete() {
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Maybe<T> onErrorComplete(final Predicate<? super Throwable> predicate) {
-        ObjectHelper.requireNonNull(predicate, "predicate is null");
+        Objects.requireNonNull(predicate, "predicate is null");
 
         return RxJavaPlugins.onAssembly(new MaybeOnErrorComplete<T>(this, predicate));
     }
@@ -3761,7 +3762,7 @@ public final Maybe<T> onErrorComplete(final Predicate<? super Throwable> predica
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Maybe<T> onErrorResumeWith(final MaybeSource<? extends T> next) {
-        ObjectHelper.requireNonNull(next, "next is null");
+        Objects.requireNonNull(next, "next is null");
         return onErrorResumeNext(Functions.justFunction(next));
     }
 
@@ -3788,7 +3789,7 @@ public final Maybe<T> onErrorResumeWith(final MaybeSource<? extends T> next) {
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Maybe<T> onErrorResumeNext(Function<? super Throwable, ? extends MaybeSource<? extends T>> resumeFunction) {
-        ObjectHelper.requireNonNull(resumeFunction, "resumeFunction is null");
+        Objects.requireNonNull(resumeFunction, "resumeFunction is null");
         return RxJavaPlugins.onAssembly(new MaybeOnErrorNext<T>(this, resumeFunction, true));
     }
 
@@ -3815,7 +3816,7 @@ public final Maybe<T> onErrorResumeNext(Function<? super Throwable, ? extends Ma
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Maybe<T> onErrorReturn(Function<? super Throwable, ? extends T> valueSupplier) {
-        ObjectHelper.requireNonNull(valueSupplier, "valueSupplier is null");
+        Objects.requireNonNull(valueSupplier, "valueSupplier is null");
         return RxJavaPlugins.onAssembly(new MaybeOnErrorReturn<T>(this, valueSupplier));
     }
 
@@ -3841,7 +3842,7 @@ public final Maybe<T> onErrorReturn(Function<? super Throwable, ? extends T> val
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Maybe<T> onErrorReturnItem(final T item) {
-        ObjectHelper.requireNonNull(item, "item is null");
+        Objects.requireNonNull(item, "item is null");
         return onErrorReturn(Functions.justFunction(item));
     }
 
@@ -3871,7 +3872,7 @@ public final Maybe<T> onErrorReturnItem(final T item) {
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Maybe<T> onExceptionResumeNext(final MaybeSource<? extends T> next) {
-        ObjectHelper.requireNonNull(next, "next is null");
+        Objects.requireNonNull(next, "next is null");
         return RxJavaPlugins.onAssembly(new MaybeOnErrorNext<T>(this, Functions.justFunction(next), false));
     }
 
@@ -4114,7 +4115,7 @@ public final Maybe<T> retry(Predicate<? super Throwable> predicate) {
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Maybe<T> retryUntil(final BooleanSupplier stop) {
-        ObjectHelper.requireNonNull(stop, "stop is null");
+        Objects.requireNonNull(stop, "stop is null");
         return retry(Long.MAX_VALUE, Functions.predicateReverseFor(stop));
     }
 
@@ -4298,20 +4299,20 @@ public final Disposable subscribe(Consumer<? super T> onSuccess, Consumer<? supe
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Disposable subscribe(Consumer<? super T> onSuccess, Consumer<? super Throwable> onError,
             Action onComplete) {
-        ObjectHelper.requireNonNull(onSuccess, "onSuccess is null");
-        ObjectHelper.requireNonNull(onError, "onError is null");
-        ObjectHelper.requireNonNull(onComplete, "onComplete is null");
+        Objects.requireNonNull(onSuccess, "onSuccess is null");
+        Objects.requireNonNull(onError, "onError is null");
+        Objects.requireNonNull(onComplete, "onComplete is null");
         return subscribeWith(new MaybeCallbackObserver<T>(onSuccess, onError, onComplete));
     }
 
     @SchedulerSupport(SchedulerSupport.NONE)
     @Override
     public final void subscribe(MaybeObserver<? super T> observer) {
-        ObjectHelper.requireNonNull(observer, "observer is null");
+        Objects.requireNonNull(observer, "observer is null");
 
         observer = RxJavaPlugins.onSubscribe(this, observer);
 
-        ObjectHelper.requireNonNull(observer, "The RxJavaPlugins.onSubscribe hook returned a null MaybeObserver. Please check the handler provided to RxJavaPlugins.setOnMaybeSubscribe for invalid null returns. Further reading: https://github.com/ReactiveX/RxJava/wiki/Plugins");
+        Objects.requireNonNull(observer, "The RxJavaPlugins.onSubscribe hook returned a null MaybeObserver. Please check the handler provided to RxJavaPlugins.setOnMaybeSubscribe for invalid null returns. Further reading: https://github.com/ReactiveX/RxJava/wiki/Plugins");
 
         try {
             subscribeActual(observer);
@@ -4354,7 +4355,7 @@ public final void subscribe(MaybeObserver<? super T> observer) {
     @NonNull
     @SchedulerSupport(SchedulerSupport.CUSTOM)
     public final Maybe<T> subscribeOn(Scheduler scheduler) {
-        ObjectHelper.requireNonNull(scheduler, "scheduler is null");
+        Objects.requireNonNull(scheduler, "scheduler is null");
         return RxJavaPlugins.onAssembly(new MaybeSubscribeOn<T>(this, scheduler));
     }
 
@@ -4407,7 +4408,7 @@ public final <E extends MaybeObserver<? super T>> E subscribeWith(E observer) {
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Maybe<T> switchIfEmpty(MaybeSource<? extends T> other) {
-        ObjectHelper.requireNonNull(other, "other is null");
+        Objects.requireNonNull(other, "other is null");
         return RxJavaPlugins.onAssembly(new MaybeSwitchIfEmpty<T>(this, other));
     }
 
@@ -4431,7 +4432,7 @@ public final Maybe<T> switchIfEmpty(MaybeSource<? extends T> other) {
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Single<T> switchIfEmpty(SingleSource<? extends T> other) {
-        ObjectHelper.requireNonNull(other, "other is null");
+        Objects.requireNonNull(other, "other is null");
         return RxJavaPlugins.onAssembly(new MaybeSwitchIfEmptySingle<T>(this, other));
     }
 
@@ -4457,7 +4458,7 @@ public final Single<T> switchIfEmpty(SingleSource<? extends T> other) {
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <U> Maybe<T> takeUntil(MaybeSource<U> other) {
-        ObjectHelper.requireNonNull(other, "other is null");
+        Objects.requireNonNull(other, "other is null");
         return RxJavaPlugins.onAssembly(new MaybeTakeUntilMaybe<T, U>(this, other));
     }
 
@@ -4487,7 +4488,7 @@ public final <U> Maybe<T> takeUntil(MaybeSource<U> other) {
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <U> Maybe<T> takeUntil(Publisher<U> other) {
-        ObjectHelper.requireNonNull(other, "other is null");
+        Objects.requireNonNull(other, "other is null");
         return RxJavaPlugins.onAssembly(new MaybeTakeUntilPublisher<T, U>(this, other));
     }
 
@@ -4539,7 +4540,7 @@ public final Maybe<T> timeout(long timeout, TimeUnit timeUnit) {
     @NonNull
     @SchedulerSupport(SchedulerSupport.COMPUTATION)
     public final Maybe<T> timeout(long timeout, TimeUnit timeUnit, MaybeSource<? extends T> fallback) {
-        ObjectHelper.requireNonNull(fallback, "fallback is null");
+        Objects.requireNonNull(fallback, "fallback is null");
         return timeout(timeout, timeUnit, Schedulers.computation(), fallback);
     }
 
@@ -4570,7 +4571,7 @@ public final Maybe<T> timeout(long timeout, TimeUnit timeUnit, MaybeSource<? ext
     @NonNull
     @SchedulerSupport(SchedulerSupport.CUSTOM)
     public final Maybe<T> timeout(long timeout, TimeUnit timeUnit, Scheduler scheduler, MaybeSource<? extends T> fallback) {
-        ObjectHelper.requireNonNull(fallback, "fallback is null");
+        Objects.requireNonNull(fallback, "fallback is null");
         return timeout(timer(timeout, timeUnit, scheduler), fallback);
     }
 
@@ -4617,7 +4618,7 @@ public final Maybe<T> timeout(long timeout, TimeUnit timeUnit, Scheduler schedul
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <U> Maybe<T> timeout(MaybeSource<U> timeoutIndicator) {
-        ObjectHelper.requireNonNull(timeoutIndicator, "timeoutIndicator is null");
+        Objects.requireNonNull(timeoutIndicator, "timeoutIndicator is null");
         return RxJavaPlugins.onAssembly(new MaybeTimeoutMaybe<T, U>(this, timeoutIndicator, null));
     }
 
@@ -4639,8 +4640,8 @@ public final <U> Maybe<T> timeout(MaybeSource<U> timeoutIndicator) {
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <U> Maybe<T> timeout(MaybeSource<U> timeoutIndicator, MaybeSource<? extends T> fallback) {
-        ObjectHelper.requireNonNull(timeoutIndicator, "timeoutIndicator is null");
-        ObjectHelper.requireNonNull(fallback, "fallback is null");
+        Objects.requireNonNull(timeoutIndicator, "timeoutIndicator is null");
+        Objects.requireNonNull(fallback, "fallback is null");
         return RxJavaPlugins.onAssembly(new MaybeTimeoutMaybe<T, U>(this, timeoutIndicator, fallback));
     }
 
@@ -4664,7 +4665,7 @@ public final <U> Maybe<T> timeout(MaybeSource<U> timeoutIndicator, MaybeSource<?
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <U> Maybe<T> timeout(Publisher<U> timeoutIndicator) {
-        ObjectHelper.requireNonNull(timeoutIndicator, "timeoutIndicator is null");
+        Objects.requireNonNull(timeoutIndicator, "timeoutIndicator is null");
         return RxJavaPlugins.onAssembly(new MaybeTimeoutPublisher<T, U>(this, timeoutIndicator, null));
     }
 
@@ -4690,8 +4691,8 @@ public final <U> Maybe<T> timeout(Publisher<U> timeoutIndicator) {
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <U> Maybe<T> timeout(Publisher<U> timeoutIndicator, MaybeSource<? extends T> fallback) {
-        ObjectHelper.requireNonNull(timeoutIndicator, "timeoutIndicator is null");
-        ObjectHelper.requireNonNull(fallback, "fallback is null");
+        Objects.requireNonNull(timeoutIndicator, "timeoutIndicator is null");
+        Objects.requireNonNull(fallback, "fallback is null");
         return RxJavaPlugins.onAssembly(new MaybeTimeoutPublisher<T, U>(this, timeoutIndicator, fallback));
     }
 
@@ -4712,7 +4713,7 @@ public final <U> Maybe<T> timeout(Publisher<U> timeoutIndicator, MaybeSource<? e
     @NonNull
     @SchedulerSupport(SchedulerSupport.CUSTOM)
     public final Maybe<T> unsubscribeOn(final Scheduler scheduler) {
-        ObjectHelper.requireNonNull(scheduler, "scheduler is null");
+        Objects.requireNonNull(scheduler, "scheduler is null");
         return RxJavaPlugins.onAssembly(new MaybeUnsubscribeOn<T>(this, scheduler));
     }
 
@@ -4746,7 +4747,7 @@ public final Maybe<T> unsubscribeOn(final Scheduler scheduler) {
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <U, R> Maybe<R> zipWith(MaybeSource<? extends U> other, BiFunction<? super T, ? super U, ? extends R> zipper) {
-        ObjectHelper.requireNonNull(other, "other is null");
+        Objects.requireNonNull(other, "other is null");
         return zip(this, other, zipper);
     }
 
diff --git a/src/main/java/io/reactivex/rxjava3/core/Notification.java b/src/main/java/io/reactivex/rxjava3/core/Notification.java
index b3270483a7..8f8ae5c4d8 100644
--- a/src/main/java/io/reactivex/rxjava3/core/Notification.java
+++ b/src/main/java/io/reactivex/rxjava3/core/Notification.java
@@ -14,7 +14,6 @@
 package io.reactivex.rxjava3.core;
 
 import io.reactivex.rxjava3.annotations.*;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.internal.util.NotificationLite;
 import java.util.Objects;
 
@@ -128,7 +127,7 @@ public String toString() {
      */
     @NonNull
     public static <T> Notification<T> createOnNext(@NonNull T value) {
-        ObjectHelper.requireNonNull(value, "value is null");
+        Objects.requireNonNull(value, "value is null");
         return new Notification<T>(value);
     }
 
@@ -141,7 +140,7 @@ public static <T> Notification<T> createOnNext(@NonNull T value) {
      */
     @NonNull
     public static <T> Notification<T> createOnError(@NonNull Throwable error) {
-        ObjectHelper.requireNonNull(error, "error is null");
+        Objects.requireNonNull(error, "error is null");
         return new Notification<T>(NotificationLite.error(error));
     }
 
diff --git a/src/main/java/io/reactivex/rxjava3/core/Observable.java b/src/main/java/io/reactivex/rxjava3/core/Observable.java
index ce0815477f..63406824ba 100644
--- a/src/main/java/io/reactivex/rxjava3/core/Observable.java
+++ b/src/main/java/io/reactivex/rxjava3/core/Observable.java
@@ -119,7 +119,7 @@ public abstract class Observable<T> implements ObservableSource<T> {
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public static <T> Observable<T> amb(Iterable<? extends ObservableSource<? extends T>> sources) {
-        ObjectHelper.requireNonNull(sources, "sources is null");
+        Objects.requireNonNull(sources, "sources is null");
         return RxJavaPlugins.onAssembly(new ObservableAmb<T>(null, sources));
     }
 
@@ -146,7 +146,7 @@ public static <T> Observable<T> amb(Iterable<? extends ObservableSource<? extend
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public static <T> Observable<T> ambArray(ObservableSource<? extends T>... sources) {
-        ObjectHelper.requireNonNull(sources, "sources is null");
+        Objects.requireNonNull(sources, "sources is null");
         int len = sources.length;
         if (len == 0) {
             return empty();
@@ -252,8 +252,8 @@ public static <T, R> Observable<R> combineLatest(Iterable<? extends ObservableSo
     @SchedulerSupport(SchedulerSupport.NONE)
     public static <T, R> Observable<R> combineLatest(Iterable<? extends ObservableSource<? extends T>> sources,
             Function<? super Object[], ? extends R> combiner, int bufferSize) {
-        ObjectHelper.requireNonNull(sources, "sources is null");
-        ObjectHelper.requireNonNull(combiner, "combiner is null");
+        Objects.requireNonNull(sources, "sources is null");
+        Objects.requireNonNull(combiner, "combiner is null");
         ObjectHelper.verifyPositive(bufferSize, "bufferSize");
 
         // the queue holds a pair of values so we need to double the capacity
@@ -345,11 +345,11 @@ public static <T, R> Observable<R> combineLatestArray(ObservableSource<? extends
     @SchedulerSupport(SchedulerSupport.NONE)
     public static <T, R> Observable<R> combineLatestArray(ObservableSource<? extends T>[] sources,
             Function<? super Object[], ? extends R> combiner, int bufferSize) {
-        ObjectHelper.requireNonNull(sources, "sources is null");
+        Objects.requireNonNull(sources, "sources is null");
         if (sources.length == 0) {
             return empty();
         }
-        ObjectHelper.requireNonNull(combiner, "combiner is null");
+        Objects.requireNonNull(combiner, "combiner is null");
         ObjectHelper.verifyPositive(bufferSize, "bufferSize");
 
         // the queue holds a pair of values so we need to double the capacity
@@ -392,8 +392,8 @@ public static <T, R> Observable<R> combineLatestArray(ObservableSource<? extends
     public static <T1, T2, R> Observable<R> combineLatest(
             ObservableSource<? extends T1> source1, ObservableSource<? extends T2> source2,
             BiFunction<? super T1, ? super T2, ? extends R> combiner) {
-        ObjectHelper.requireNonNull(source1, "source1 is null");
-        ObjectHelper.requireNonNull(source2, "source2 is null");
+        Objects.requireNonNull(source1, "source1 is null");
+        Objects.requireNonNull(source2, "source2 is null");
         return combineLatestArray(new ObservableSource[] { source1, source2 }, Functions.toFunction(combiner), bufferSize());
     }
 
@@ -436,9 +436,9 @@ public static <T1, T2, T3, R> Observable<R> combineLatest(
             ObservableSource<? extends T1> source1, ObservableSource<? extends T2> source2,
             ObservableSource<? extends T3> source3,
             Function3<? super T1, ? super T2, ? super T3, ? extends R> combiner) {
-        ObjectHelper.requireNonNull(source1, "source1 is null");
-        ObjectHelper.requireNonNull(source2, "source2 is null");
-        ObjectHelper.requireNonNull(source3, "source3 is null");
+        Objects.requireNonNull(source1, "source1 is null");
+        Objects.requireNonNull(source2, "source2 is null");
+        Objects.requireNonNull(source3, "source3 is null");
         return combineLatestArray(new ObservableSource[] { source1, source2, source3 }, Functions.toFunction(combiner), bufferSize());
     }
 
@@ -484,10 +484,10 @@ public static <T1, T2, T3, T4, R> Observable<R> combineLatest(
             ObservableSource<? extends T1> source1, ObservableSource<? extends T2> source2,
             ObservableSource<? extends T3> source3, ObservableSource<? extends T4> source4,
             Function4<? super T1, ? super T2, ? super T3, ? super T4, ? extends R> combiner) {
-        ObjectHelper.requireNonNull(source1, "source1 is null");
-        ObjectHelper.requireNonNull(source2, "source2 is null");
-        ObjectHelper.requireNonNull(source3, "source3 is null");
-        ObjectHelper.requireNonNull(source4, "source4 is null");
+        Objects.requireNonNull(source1, "source1 is null");
+        Objects.requireNonNull(source2, "source2 is null");
+        Objects.requireNonNull(source3, "source3 is null");
+        Objects.requireNonNull(source4, "source4 is null");
         return combineLatestArray(new ObservableSource[] { source1, source2, source3, source4 }, Functions.toFunction(combiner), bufferSize());
     }
 
@@ -537,11 +537,11 @@ public static <T1, T2, T3, T4, T5, R> Observable<R> combineLatest(
             ObservableSource<? extends T3> source3, ObservableSource<? extends T4> source4,
             ObservableSource<? extends T5> source5,
             Function5<? super T1, ? super T2, ? super T3, ? super T4, ? super T5, ? extends R> combiner) {
-        ObjectHelper.requireNonNull(source1, "source1 is null");
-        ObjectHelper.requireNonNull(source2, "source2 is null");
-        ObjectHelper.requireNonNull(source3, "source3 is null");
-        ObjectHelper.requireNonNull(source4, "source4 is null");
-        ObjectHelper.requireNonNull(source5, "source5 is null");
+        Objects.requireNonNull(source1, "source1 is null");
+        Objects.requireNonNull(source2, "source2 is null");
+        Objects.requireNonNull(source3, "source3 is null");
+        Objects.requireNonNull(source4, "source4 is null");
+        Objects.requireNonNull(source5, "source5 is null");
         return combineLatestArray(new ObservableSource[] { source1, source2, source3, source4, source5 }, Functions.toFunction(combiner), bufferSize());
     }
 
@@ -594,12 +594,12 @@ public static <T1, T2, T3, T4, T5, T6, R> Observable<R> combineLatest(
             ObservableSource<? extends T3> source3, ObservableSource<? extends T4> source4,
             ObservableSource<? extends T5> source5, ObservableSource<? extends T6> source6,
             Function6<? super T1, ? super T2, ? super T3, ? super T4, ? super T5, ? super T6, ? extends R> combiner) {
-        ObjectHelper.requireNonNull(source1, "source1 is null");
-        ObjectHelper.requireNonNull(source2, "source2 is null");
-        ObjectHelper.requireNonNull(source3, "source3 is null");
-        ObjectHelper.requireNonNull(source4, "source4 is null");
-        ObjectHelper.requireNonNull(source5, "source5 is null");
-        ObjectHelper.requireNonNull(source6, "source6 is null");
+        Objects.requireNonNull(source1, "source1 is null");
+        Objects.requireNonNull(source2, "source2 is null");
+        Objects.requireNonNull(source3, "source3 is null");
+        Objects.requireNonNull(source4, "source4 is null");
+        Objects.requireNonNull(source5, "source5 is null");
+        Objects.requireNonNull(source6, "source6 is null");
         return combineLatestArray(new ObservableSource[] { source1, source2, source3, source4, source5, source6 }, Functions.toFunction(combiner), bufferSize());
     }
 
@@ -656,13 +656,13 @@ public static <T1, T2, T3, T4, T5, T6, T7, R> Observable<R> combineLatest(
             ObservableSource<? extends T5> source5, ObservableSource<? extends T6> source6,
             ObservableSource<? extends T7> source7,
             Function7<? super T1, ? super T2, ? super T3, ? super T4, ? super T5, ? super T6, ? super T7, ? extends R> combiner) {
-        ObjectHelper.requireNonNull(source1, "source1 is null");
-        ObjectHelper.requireNonNull(source2, "source2 is null");
-        ObjectHelper.requireNonNull(source3, "source3 is null");
-        ObjectHelper.requireNonNull(source4, "source4 is null");
-        ObjectHelper.requireNonNull(source5, "source5 is null");
-        ObjectHelper.requireNonNull(source6, "source6 is null");
-        ObjectHelper.requireNonNull(source7, "source7 is null");
+        Objects.requireNonNull(source1, "source1 is null");
+        Objects.requireNonNull(source2, "source2 is null");
+        Objects.requireNonNull(source3, "source3 is null");
+        Objects.requireNonNull(source4, "source4 is null");
+        Objects.requireNonNull(source5, "source5 is null");
+        Objects.requireNonNull(source6, "source6 is null");
+        Objects.requireNonNull(source7, "source7 is null");
         return combineLatestArray(new ObservableSource[] { source1, source2, source3, source4, source5, source6, source7 }, Functions.toFunction(combiner), bufferSize());
     }
 
@@ -722,14 +722,14 @@ public static <T1, T2, T3, T4, T5, T6, T7, T8, R> Observable<R> combineLatest(
             ObservableSource<? extends T5> source5, ObservableSource<? extends T6> source6,
             ObservableSource<? extends T7> source7, ObservableSource<? extends T8> source8,
             Function8<? super T1, ? super T2, ? super T3, ? super T4, ? super T5, ? super T6, ? super T7, ? super T8, ? extends R> combiner) {
-        ObjectHelper.requireNonNull(source1, "source1 is null");
-        ObjectHelper.requireNonNull(source2, "source2 is null");
-        ObjectHelper.requireNonNull(source3, "source3 is null");
-        ObjectHelper.requireNonNull(source4, "source4 is null");
-        ObjectHelper.requireNonNull(source5, "source5 is null");
-        ObjectHelper.requireNonNull(source6, "source6 is null");
-        ObjectHelper.requireNonNull(source7, "source7 is null");
-        ObjectHelper.requireNonNull(source8, "source8 is null");
+        Objects.requireNonNull(source1, "source1 is null");
+        Objects.requireNonNull(source2, "source2 is null");
+        Objects.requireNonNull(source3, "source3 is null");
+        Objects.requireNonNull(source4, "source4 is null");
+        Objects.requireNonNull(source5, "source5 is null");
+        Objects.requireNonNull(source6, "source6 is null");
+        Objects.requireNonNull(source7, "source7 is null");
+        Objects.requireNonNull(source8, "source8 is null");
         return combineLatestArray(new ObservableSource[] { source1, source2, source3, source4, source5, source6, source7, source8 }, Functions.toFunction(combiner), bufferSize());
     }
 
@@ -793,15 +793,15 @@ public static <T1, T2, T3, T4, T5, T6, T7, T8, T9, R> Observable<R> combineLates
             ObservableSource<? extends T7> source7, ObservableSource<? extends T8> source8,
             ObservableSource<? extends T9> source9,
             Function9<? super T1, ? super T2, ? super T3, ? super T4, ? super T5, ? super T6, ? super T7, ? super T8, ? super T9, ? extends R> combiner) {
-        ObjectHelper.requireNonNull(source1, "source1 is null");
-        ObjectHelper.requireNonNull(source2, "source2 is null");
-        ObjectHelper.requireNonNull(source3, "source3 is null");
-        ObjectHelper.requireNonNull(source4, "source4 is null");
-        ObjectHelper.requireNonNull(source5, "source5 is null");
-        ObjectHelper.requireNonNull(source6, "source6 is null");
-        ObjectHelper.requireNonNull(source7, "source7 is null");
-        ObjectHelper.requireNonNull(source8, "source8 is null");
-        ObjectHelper.requireNonNull(source9, "source9 is null");
+        Objects.requireNonNull(source1, "source1 is null");
+        Objects.requireNonNull(source2, "source2 is null");
+        Objects.requireNonNull(source3, "source3 is null");
+        Objects.requireNonNull(source4, "source4 is null");
+        Objects.requireNonNull(source5, "source5 is null");
+        Objects.requireNonNull(source6, "source6 is null");
+        Objects.requireNonNull(source7, "source7 is null");
+        Objects.requireNonNull(source8, "source8 is null");
+        Objects.requireNonNull(source9, "source9 is null");
         return combineLatestArray(new ObservableSource[] { source1, source2, source3, source4, source5, source6, source7, source8, source9 }, Functions.toFunction(combiner), bufferSize());
     }
 
@@ -891,7 +891,7 @@ public static <T, R> Observable<R> combineLatestDelayError(ObservableSource<? ex
     public static <T, R> Observable<R> combineLatestDelayError(ObservableSource<? extends T>[] sources,
             Function<? super Object[], ? extends R> combiner, int bufferSize) {
         ObjectHelper.verifyPositive(bufferSize, "bufferSize");
-        ObjectHelper.requireNonNull(combiner, "combiner is null");
+        Objects.requireNonNull(combiner, "combiner is null");
         if (sources.length == 0) {
             return empty();
         }
@@ -986,8 +986,8 @@ public static <T, R> Observable<R> combineLatestDelayError(Iterable<? extends Ob
     @SchedulerSupport(SchedulerSupport.NONE)
     public static <T, R> Observable<R> combineLatestDelayError(Iterable<? extends ObservableSource<? extends T>> sources,
             Function<? super Object[], ? extends R> combiner, int bufferSize) {
-        ObjectHelper.requireNonNull(sources, "sources is null");
-        ObjectHelper.requireNonNull(combiner, "combiner is null");
+        Objects.requireNonNull(sources, "sources is null");
+        Objects.requireNonNull(combiner, "combiner is null");
         ObjectHelper.verifyPositive(bufferSize, "bufferSize");
 
         // the queue holds a pair of values so we need to double the capacity
@@ -1013,7 +1013,7 @@ public static <T, R> Observable<R> combineLatestDelayError(Iterable<? extends Ob
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public static <T> Observable<T> concat(Iterable<? extends ObservableSource<? extends T>> sources) {
-        ObjectHelper.requireNonNull(sources, "sources is null");
+        Objects.requireNonNull(sources, "sources is null");
         return fromIterable(sources).concatMapDelayError((Function)Functions.identity(), false, bufferSize());
     }
 
@@ -1064,7 +1064,7 @@ public static <T> Observable<T> concat(ObservableSource<? extends ObservableSour
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public static <T> Observable<T> concat(ObservableSource<? extends ObservableSource<? extends T>> sources, int prefetch) {
-        ObjectHelper.requireNonNull(sources, "sources is null");
+        Objects.requireNonNull(sources, "sources is null");
         ObjectHelper.verifyPositive(prefetch, "prefetch");
         return RxJavaPlugins.onAssembly(new ObservableConcatMap(sources, Functions.identity(), prefetch, ErrorMode.IMMEDIATE));
     }
@@ -1093,8 +1093,8 @@ public static <T> Observable<T> concat(ObservableSource<? extends ObservableSour
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public static <T> Observable<T> concat(ObservableSource<? extends T> source1, ObservableSource<? extends T> source2) {
-        ObjectHelper.requireNonNull(source1, "source1 is null");
-        ObjectHelper.requireNonNull(source2, "source2 is null");
+        Objects.requireNonNull(source1, "source1 is null");
+        Objects.requireNonNull(source2, "source2 is null");
         return concatArray(source1, source2);
     }
 
@@ -1126,9 +1126,9 @@ public static <T> Observable<T> concat(ObservableSource<? extends T> source1, Ob
     public static <T> Observable<T> concat(
             ObservableSource<? extends T> source1, ObservableSource<? extends T> source2,
             ObservableSource<? extends T> source3) {
-        ObjectHelper.requireNonNull(source1, "source1 is null");
-        ObjectHelper.requireNonNull(source2, "source2 is null");
-        ObjectHelper.requireNonNull(source3, "source3 is null");
+        Objects.requireNonNull(source1, "source1 is null");
+        Objects.requireNonNull(source2, "source2 is null");
+        Objects.requireNonNull(source3, "source3 is null");
         return concatArray(source1, source2, source3);
     }
 
@@ -1162,10 +1162,10 @@ public static <T> Observable<T> concat(
     public static <T> Observable<T> concat(
             ObservableSource<? extends T> source1, ObservableSource<? extends T> source2,
             ObservableSource<? extends T> source3, ObservableSource<? extends T> source4) {
-        ObjectHelper.requireNonNull(source1, "source1 is null");
-        ObjectHelper.requireNonNull(source2, "source2 is null");
-        ObjectHelper.requireNonNull(source3, "source3 is null");
-        ObjectHelper.requireNonNull(source4, "source4 is null");
+        Objects.requireNonNull(source1, "source1 is null");
+        Objects.requireNonNull(source2, "source2 is null");
+        Objects.requireNonNull(source3, "source3 is null");
+        Objects.requireNonNull(source4, "source4 is null");
         return concatArray(source1, source2, source3, source4);
     }
 
@@ -1344,7 +1344,7 @@ public static <T> Observable<T> concatArrayEagerDelayError(int maxConcurrency, i
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public static <T> Observable<T> concatDelayError(Iterable<? extends ObservableSource<? extends T>> sources) {
-        ObjectHelper.requireNonNull(sources, "sources is null");
+        Objects.requireNonNull(sources, "sources is null");
         return concatDelayError(fromIterable(sources));
     }
 
@@ -1390,7 +1390,7 @@ public static <T> Observable<T> concatDelayError(ObservableSource<? extends Obse
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public static <T> Observable<T> concatDelayError(ObservableSource<? extends ObservableSource<? extends T>> sources, int prefetch, boolean tillTheEnd) {
-        ObjectHelper.requireNonNull(sources, "sources is null");
+        Objects.requireNonNull(sources, "sources is null");
         ObjectHelper.verifyPositive(prefetch, "prefetch is null");
         return RxJavaPlugins.onAssembly(new ObservableConcatMap(sources, Functions.identity(), prefetch, tillTheEnd ? ErrorMode.END : ErrorMode.BOUNDARY));
     }
@@ -1549,7 +1549,7 @@ public static <T> Observable<T> concatEager(Iterable<? extends ObservableSource<
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public static <T> Observable<T> create(ObservableOnSubscribe<T> source) {
-        ObjectHelper.requireNonNull(source, "source is null");
+        Objects.requireNonNull(source, "source is null");
         return RxJavaPlugins.onAssembly(new ObservableCreate<T>(source));
     }
 
@@ -1581,7 +1581,7 @@ public static <T> Observable<T> create(ObservableOnSubscribe<T> source) {
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public static <T> Observable<T> defer(Supplier<? extends ObservableSource<? extends T>> supplier) {
-        ObjectHelper.requireNonNull(supplier, "supplier is null");
+        Objects.requireNonNull(supplier, "supplier is null");
         return RxJavaPlugins.onAssembly(new ObservableDefer<T>(supplier));
     }
 
@@ -1630,7 +1630,7 @@ public static <T> Observable<T> empty() {
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public static <T> Observable<T> error(Supplier<? extends Throwable> errorSupplier) {
-        ObjectHelper.requireNonNull(errorSupplier, "errorSupplier is null");
+        Objects.requireNonNull(errorSupplier, "errorSupplier is null");
         return RxJavaPlugins.onAssembly(new ObservableError<T>(errorSupplier));
     }
 
@@ -1656,7 +1656,7 @@ public static <T> Observable<T> error(Supplier<? extends Throwable> errorSupplie
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public static <T> Observable<T> error(final Throwable exception) {
-        ObjectHelper.requireNonNull(exception, "exception is null");
+        Objects.requireNonNull(exception, "exception is null");
         return error(Functions.justSupplier(exception));
     }
 
@@ -1680,7 +1680,7 @@ public static <T> Observable<T> error(final Throwable exception) {
     @SchedulerSupport(SchedulerSupport.NONE)
     @NonNull
     public static <T> Observable<T> fromArray(T... items) {
-        ObjectHelper.requireNonNull(items, "items is null");
+        Objects.requireNonNull(items, "items is null");
         if (items.length == 0) {
             return empty();
         }
@@ -1723,7 +1723,7 @@ public static <T> Observable<T> fromArray(T... items) {
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public static <T> Observable<T> fromCallable(Callable<? extends T> supplier) {
-        ObjectHelper.requireNonNull(supplier, "supplier is null");
+        Objects.requireNonNull(supplier, "supplier is null");
         return RxJavaPlugins.onAssembly(new ObservableFromCallable<T>(supplier));
     }
 
@@ -1757,7 +1757,7 @@ public static <T> Observable<T> fromCallable(Callable<? extends T> supplier) {
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public static <T> Observable<T> fromFuture(Future<? extends T> future) {
-        ObjectHelper.requireNonNull(future, "future is null");
+        Objects.requireNonNull(future, "future is null");
         return RxJavaPlugins.onAssembly(new ObservableFromFuture<T>(future, 0L, null));
     }
 
@@ -1795,8 +1795,8 @@ public static <T> Observable<T> fromFuture(Future<? extends T> future) {
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public static <T> Observable<T> fromFuture(Future<? extends T> future, long timeout, TimeUnit unit) {
-        ObjectHelper.requireNonNull(future, "future is null");
-        ObjectHelper.requireNonNull(unit, "unit is null");
+        Objects.requireNonNull(future, "future is null");
+        Objects.requireNonNull(unit, "unit is null");
         return RxJavaPlugins.onAssembly(new ObservableFromFuture<T>(future, timeout, unit));
     }
 
@@ -1837,7 +1837,7 @@ public static <T> Observable<T> fromFuture(Future<? extends T> future, long time
     @NonNull
     @SchedulerSupport(SchedulerSupport.CUSTOM)
     public static <T> Observable<T> fromFuture(Future<? extends T> future, long timeout, TimeUnit unit, Scheduler scheduler) {
-        ObjectHelper.requireNonNull(scheduler, "scheduler is null");
+        Objects.requireNonNull(scheduler, "scheduler is null");
         Observable<T> o = fromFuture(future, timeout, unit);
         return o.subscribeOn(scheduler);
     }
@@ -1873,7 +1873,7 @@ public static <T> Observable<T> fromFuture(Future<? extends T> future, long time
     @NonNull
     @SchedulerSupport(SchedulerSupport.CUSTOM)
     public static <T> Observable<T> fromFuture(Future<? extends T> future, Scheduler scheduler) {
-        ObjectHelper.requireNonNull(scheduler, "scheduler is null");
+        Objects.requireNonNull(scheduler, "scheduler is null");
         Observable<T> o = fromFuture(future);
         return o.subscribeOn(scheduler);
     }
@@ -1899,7 +1899,7 @@ public static <T> Observable<T> fromFuture(Future<? extends T> future, Scheduler
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public static <T> Observable<T> fromIterable(Iterable<? extends T> source) {
-        ObjectHelper.requireNonNull(source, "source is null");
+        Objects.requireNonNull(source, "source is null");
         return RxJavaPlugins.onAssembly(new ObservableFromIterable<T>(source));
     }
 
@@ -1936,7 +1936,7 @@ public static <T> Observable<T> fromIterable(Iterable<? extends T> source) {
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public static <T> Observable<T> fromPublisher(Publisher<? extends T> publisher) {
-        ObjectHelper.requireNonNull(publisher, "publisher is null");
+        Objects.requireNonNull(publisher, "publisher is null");
         return RxJavaPlugins.onAssembly(new ObservableFromPublisher<T>(publisher));
     }
 
@@ -1973,7 +1973,7 @@ public static <T> Observable<T> fromPublisher(Publisher<? extends T> publisher)
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public static <T> Observable<T> fromSupplier(Supplier<? extends T> supplier) {
-        ObjectHelper.requireNonNull(supplier, "supplier is null");
+        Objects.requireNonNull(supplier, "supplier is null");
         return RxJavaPlugins.onAssembly(new ObservableFromSupplier<T>(supplier));
     }
 
@@ -2002,7 +2002,7 @@ public static <T> Observable<T> fromSupplier(Supplier<? extends T> supplier) {
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public static <T> Observable<T> generate(final Consumer<Emitter<T>> generator) {
-        ObjectHelper.requireNonNull(generator, "generator is null");
+        Objects.requireNonNull(generator, "generator is null");
         return generate(Functions.<Object>nullSupplier(),
                 ObservableInternalHelper.simpleGenerator(generator), Functions.<Object>emptyConsumer());
     }
@@ -2034,7 +2034,7 @@ public static <T> Observable<T> generate(final Consumer<Emitter<T>> generator) {
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public static <T, S> Observable<T> generate(Supplier<S> initialState, final BiConsumer<S, Emitter<T>> generator) {
-        ObjectHelper.requireNonNull(generator, "generator is null");
+        Objects.requireNonNull(generator, "generator is null");
         return generate(initialState, ObservableInternalHelper.simpleBiGenerator(generator), Functions.emptyConsumer());
     }
 
@@ -2070,7 +2070,7 @@ public static <T, S> Observable<T> generate(
             final Supplier<S> initialState,
             final BiConsumer<S, Emitter<T>> generator,
             Consumer<? super S> disposeState) {
-        ObjectHelper.requireNonNull(generator, "generator is null");
+        Objects.requireNonNull(generator, "generator is null");
         return generate(initialState, ObservableInternalHelper.simpleBiGenerator(generator), disposeState);
     }
 
@@ -2135,9 +2135,9 @@ public static <T, S> Observable<T> generate(Supplier<S> initialState, BiFunction
     @SchedulerSupport(SchedulerSupport.NONE)
     public static <T, S> Observable<T> generate(Supplier<S> initialState, BiFunction<S, Emitter<T>, S> generator,
             Consumer<? super S> disposeState) {
-        ObjectHelper.requireNonNull(initialState, "initialState is null");
-        ObjectHelper.requireNonNull(generator, "generator is null");
-        ObjectHelper.requireNonNull(disposeState, "disposeState is null");
+        Objects.requireNonNull(initialState, "initialState is null");
+        Objects.requireNonNull(generator, "generator is null");
+        Objects.requireNonNull(disposeState, "disposeState is null");
         return RxJavaPlugins.onAssembly(new ObservableGenerate<T, S>(initialState, generator, disposeState));
     }
 
@@ -2195,8 +2195,8 @@ public static Observable<Long> interval(long initialDelay, long period, TimeUnit
     @NonNull
     @SchedulerSupport(SchedulerSupport.CUSTOM)
     public static Observable<Long> interval(long initialDelay, long period, TimeUnit unit, Scheduler scheduler) {
-        ObjectHelper.requireNonNull(unit, "unit is null");
-        ObjectHelper.requireNonNull(scheduler, "scheduler is null");
+        Objects.requireNonNull(unit, "unit is null");
+        Objects.requireNonNull(scheduler, "scheduler is null");
 
         return RxJavaPlugins.onAssembly(new ObservableInterval(Math.max(0L, initialDelay), Math.max(0L, period), unit, scheduler));
     }
@@ -2304,8 +2304,8 @@ public static Observable<Long> intervalRange(long start, long count, long initia
         if (start > 0 && end < 0) {
             throw new IllegalArgumentException("Overflow! start + count is bigger than Long.MAX_VALUE");
         }
-        ObjectHelper.requireNonNull(unit, "unit is null");
-        ObjectHelper.requireNonNull(scheduler, "scheduler is null");
+        Objects.requireNonNull(unit, "unit is null");
+        Objects.requireNonNull(scheduler, "scheduler is null");
 
         return RxJavaPlugins.onAssembly(new ObservableIntervalRange(start, end, Math.max(0L, initialDelay), Math.max(0L, period), unit, scheduler));
     }
@@ -2342,7 +2342,7 @@ public static Observable<Long> intervalRange(long start, long count, long initia
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public static <T> Observable<T> just(T item) {
-        ObjectHelper.requireNonNull(item, "item is null");
+        Objects.requireNonNull(item, "item is null");
         return RxJavaPlugins.onAssembly(new ObservableJust<T>(item));
     }
 
@@ -2369,8 +2369,8 @@ public static <T> Observable<T> just(T item) {
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public static <T> Observable<T> just(T item1, T item2) {
-        ObjectHelper.requireNonNull(item1, "item1 is null");
-        ObjectHelper.requireNonNull(item2, "item2 is null");
+        Objects.requireNonNull(item1, "item1 is null");
+        Objects.requireNonNull(item2, "item2 is null");
 
         return fromArray(item1, item2);
     }
@@ -2400,9 +2400,9 @@ public static <T> Observable<T> just(T item1, T item2) {
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public static <T> Observable<T> just(T item1, T item2, T item3) {
-        ObjectHelper.requireNonNull(item1, "item1 is null");
-        ObjectHelper.requireNonNull(item2, "item2 is null");
-        ObjectHelper.requireNonNull(item3, "item3 is null");
+        Objects.requireNonNull(item1, "item1 is null");
+        Objects.requireNonNull(item2, "item2 is null");
+        Objects.requireNonNull(item3, "item3 is null");
 
         return fromArray(item1, item2, item3);
     }
@@ -2434,10 +2434,10 @@ public static <T> Observable<T> just(T item1, T item2, T item3) {
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public static <T> Observable<T> just(T item1, T item2, T item3, T item4) {
-        ObjectHelper.requireNonNull(item1, "item1 is null");
-        ObjectHelper.requireNonNull(item2, "item2 is null");
-        ObjectHelper.requireNonNull(item3, "item3 is null");
-        ObjectHelper.requireNonNull(item4, "item4 is null");
+        Objects.requireNonNull(item1, "item1 is null");
+        Objects.requireNonNull(item2, "item2 is null");
+        Objects.requireNonNull(item3, "item3 is null");
+        Objects.requireNonNull(item4, "item4 is null");
 
         return fromArray(item1, item2, item3, item4);
     }
@@ -2471,11 +2471,11 @@ public static <T> Observable<T> just(T item1, T item2, T item3, T item4) {
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public static <T> Observable<T> just(T item1, T item2, T item3, T item4, T item5) {
-        ObjectHelper.requireNonNull(item1, "item1 is null");
-        ObjectHelper.requireNonNull(item2, "item2 is null");
-        ObjectHelper.requireNonNull(item3, "item3 is null");
-        ObjectHelper.requireNonNull(item4, "item4 is null");
-        ObjectHelper.requireNonNull(item5, "item5 is null");
+        Objects.requireNonNull(item1, "item1 is null");
+        Objects.requireNonNull(item2, "item2 is null");
+        Objects.requireNonNull(item3, "item3 is null");
+        Objects.requireNonNull(item4, "item4 is null");
+        Objects.requireNonNull(item5, "item5 is null");
 
         return fromArray(item1, item2, item3, item4, item5);
     }
@@ -2511,12 +2511,12 @@ public static <T> Observable<T> just(T item1, T item2, T item3, T item4, T item5
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public static <T> Observable<T> just(T item1, T item2, T item3, T item4, T item5, T item6) {
-        ObjectHelper.requireNonNull(item1, "item1 is null");
-        ObjectHelper.requireNonNull(item2, "item2 is null");
-        ObjectHelper.requireNonNull(item3, "item3 is null");
-        ObjectHelper.requireNonNull(item4, "item4 is null");
-        ObjectHelper.requireNonNull(item5, "item5 is null");
-        ObjectHelper.requireNonNull(item6, "item6 is null");
+        Objects.requireNonNull(item1, "item1 is null");
+        Objects.requireNonNull(item2, "item2 is null");
+        Objects.requireNonNull(item3, "item3 is null");
+        Objects.requireNonNull(item4, "item4 is null");
+        Objects.requireNonNull(item5, "item5 is null");
+        Objects.requireNonNull(item6, "item6 is null");
 
         return fromArray(item1, item2, item3, item4, item5, item6);
     }
@@ -2554,13 +2554,13 @@ public static <T> Observable<T> just(T item1, T item2, T item3, T item4, T item5
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public static <T> Observable<T> just(T item1, T item2, T item3, T item4, T item5, T item6, T item7) {
-        ObjectHelper.requireNonNull(item1, "item1 is null");
-        ObjectHelper.requireNonNull(item2, "item2 is null");
-        ObjectHelper.requireNonNull(item3, "item3 is null");
-        ObjectHelper.requireNonNull(item4, "item4 is null");
-        ObjectHelper.requireNonNull(item5, "item5 is null");
-        ObjectHelper.requireNonNull(item6, "item6 is null");
-        ObjectHelper.requireNonNull(item7, "item7 is null");
+        Objects.requireNonNull(item1, "item1 is null");
+        Objects.requireNonNull(item2, "item2 is null");
+        Objects.requireNonNull(item3, "item3 is null");
+        Objects.requireNonNull(item4, "item4 is null");
+        Objects.requireNonNull(item5, "item5 is null");
+        Objects.requireNonNull(item6, "item6 is null");
+        Objects.requireNonNull(item7, "item7 is null");
 
         return fromArray(item1, item2, item3, item4, item5, item6, item7);
     }
@@ -2600,14 +2600,14 @@ public static <T> Observable<T> just(T item1, T item2, T item3, T item4, T item5
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public static <T> Observable<T> just(T item1, T item2, T item3, T item4, T item5, T item6, T item7, T item8) {
-        ObjectHelper.requireNonNull(item1, "item1 is null");
-        ObjectHelper.requireNonNull(item2, "item2 is null");
-        ObjectHelper.requireNonNull(item3, "item3 is null");
-        ObjectHelper.requireNonNull(item4, "item4 is null");
-        ObjectHelper.requireNonNull(item5, "item5 is null");
-        ObjectHelper.requireNonNull(item6, "item6 is null");
-        ObjectHelper.requireNonNull(item7, "item7 is null");
-        ObjectHelper.requireNonNull(item8, "item8 is null");
+        Objects.requireNonNull(item1, "item1 is null");
+        Objects.requireNonNull(item2, "item2 is null");
+        Objects.requireNonNull(item3, "item3 is null");
+        Objects.requireNonNull(item4, "item4 is null");
+        Objects.requireNonNull(item5, "item5 is null");
+        Objects.requireNonNull(item6, "item6 is null");
+        Objects.requireNonNull(item7, "item7 is null");
+        Objects.requireNonNull(item8, "item8 is null");
 
         return fromArray(item1, item2, item3, item4, item5, item6, item7, item8);
     }
@@ -2649,15 +2649,15 @@ public static <T> Observable<T> just(T item1, T item2, T item3, T item4, T item5
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public static <T> Observable<T> just(T item1, T item2, T item3, T item4, T item5, T item6, T item7, T item8, T item9) {
-        ObjectHelper.requireNonNull(item1, "item1 is null");
-        ObjectHelper.requireNonNull(item2, "item2 is null");
-        ObjectHelper.requireNonNull(item3, "item3 is null");
-        ObjectHelper.requireNonNull(item4, "item4 is null");
-        ObjectHelper.requireNonNull(item5, "item5 is null");
-        ObjectHelper.requireNonNull(item6, "item6 is null");
-        ObjectHelper.requireNonNull(item7, "item7 is null");
-        ObjectHelper.requireNonNull(item8, "item8 is null");
-        ObjectHelper.requireNonNull(item9, "item9 is null");
+        Objects.requireNonNull(item1, "item1 is null");
+        Objects.requireNonNull(item2, "item2 is null");
+        Objects.requireNonNull(item3, "item3 is null");
+        Objects.requireNonNull(item4, "item4 is null");
+        Objects.requireNonNull(item5, "item5 is null");
+        Objects.requireNonNull(item6, "item6 is null");
+        Objects.requireNonNull(item7, "item7 is null");
+        Objects.requireNonNull(item8, "item8 is null");
+        Objects.requireNonNull(item9, "item9 is null");
 
         return fromArray(item1, item2, item3, item4, item5, item6, item7, item8, item9);
     }
@@ -2701,16 +2701,16 @@ public static <T> Observable<T> just(T item1, T item2, T item3, T item4, T item5
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public static <T> Observable<T> just(T item1, T item2, T item3, T item4, T item5, T item6, T item7, T item8, T item9, T item10) {
-        ObjectHelper.requireNonNull(item1, "item1 is null");
-        ObjectHelper.requireNonNull(item2, "item2 is null");
-        ObjectHelper.requireNonNull(item3, "item3 is null");
-        ObjectHelper.requireNonNull(item4, "item4 is null");
-        ObjectHelper.requireNonNull(item5, "item5 is null");
-        ObjectHelper.requireNonNull(item6, "item6 is null");
-        ObjectHelper.requireNonNull(item7, "item7 is null");
-        ObjectHelper.requireNonNull(item8, "item8 is null");
-        ObjectHelper.requireNonNull(item9, "item9 is null");
-        ObjectHelper.requireNonNull(item10, "item10 is null");
+        Objects.requireNonNull(item1, "item1 is null");
+        Objects.requireNonNull(item2, "item2 is null");
+        Objects.requireNonNull(item3, "item3 is null");
+        Objects.requireNonNull(item4, "item4 is null");
+        Objects.requireNonNull(item5, "item5 is null");
+        Objects.requireNonNull(item6, "item6 is null");
+        Objects.requireNonNull(item7, "item7 is null");
+        Objects.requireNonNull(item8, "item8 is null");
+        Objects.requireNonNull(item9, "item9 is null");
+        Objects.requireNonNull(item10, "item10 is null");
 
         return fromArray(item1, item2, item3, item4, item5, item6, item7, item8, item9, item10);
     }
@@ -2932,7 +2932,7 @@ public static <T> Observable<T> merge(Iterable<? extends ObservableSource<? exte
     @SchedulerSupport(SchedulerSupport.NONE)
     @SuppressWarnings({ "unchecked", "rawtypes" })
     public static <T> Observable<T> merge(ObservableSource<? extends ObservableSource<? extends T>> sources) {
-        ObjectHelper.requireNonNull(sources, "sources is null");
+        Objects.requireNonNull(sources, "sources is null");
         return RxJavaPlugins.onAssembly(new ObservableFlatMap(sources, Functions.identity(), false, Integer.MAX_VALUE, bufferSize()));
     }
 
@@ -2980,7 +2980,7 @@ public static <T> Observable<T> merge(ObservableSource<? extends ObservableSourc
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.NONE)
     public static <T> Observable<T> merge(ObservableSource<? extends ObservableSource<? extends T>> sources, int maxConcurrency) {
-        ObjectHelper.requireNonNull(sources, "sources is null");
+        Objects.requireNonNull(sources, "sources is null");
         ObjectHelper.verifyPositive(maxConcurrency, "maxConcurrency");
         return RxJavaPlugins.onAssembly(new ObservableFlatMap(sources, Functions.identity(), false, maxConcurrency, bufferSize()));
     }
@@ -3023,8 +3023,8 @@ public static <T> Observable<T> merge(ObservableSource<? extends ObservableSourc
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.NONE)
     public static <T> Observable<T> merge(ObservableSource<? extends T> source1, ObservableSource<? extends T> source2) {
-        ObjectHelper.requireNonNull(source1, "source1 is null");
-        ObjectHelper.requireNonNull(source2, "source2 is null");
+        Objects.requireNonNull(source1, "source1 is null");
+        Objects.requireNonNull(source2, "source2 is null");
         return fromArray(source1, source2).flatMap((Function)Functions.identity(), false, 2);
     }
 
@@ -3068,9 +3068,9 @@ public static <T> Observable<T> merge(ObservableSource<? extends T> source1, Obs
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.NONE)
     public static <T> Observable<T> merge(ObservableSource<? extends T> source1, ObservableSource<? extends T> source2, ObservableSource<? extends T> source3) {
-        ObjectHelper.requireNonNull(source1, "source1 is null");
-        ObjectHelper.requireNonNull(source2, "source2 is null");
-        ObjectHelper.requireNonNull(source3, "source3 is null");
+        Objects.requireNonNull(source1, "source1 is null");
+        Objects.requireNonNull(source2, "source2 is null");
+        Objects.requireNonNull(source3, "source3 is null");
         return fromArray(source1, source2, source3).flatMap((Function)Functions.identity(), false, 3);
     }
 
@@ -3118,10 +3118,10 @@ public static <T> Observable<T> merge(ObservableSource<? extends T> source1, Obs
     public static <T> Observable<T> merge(
             ObservableSource<? extends T> source1, ObservableSource<? extends T> source2,
             ObservableSource<? extends T> source3, ObservableSource<? extends T> source4) {
-        ObjectHelper.requireNonNull(source1, "source1 is null");
-        ObjectHelper.requireNonNull(source2, "source2 is null");
-        ObjectHelper.requireNonNull(source3, "source3 is null");
-        ObjectHelper.requireNonNull(source4, "source4 is null");
+        Objects.requireNonNull(source1, "source1 is null");
+        Objects.requireNonNull(source2, "source2 is null");
+        Objects.requireNonNull(source3, "source3 is null");
+        Objects.requireNonNull(source4, "source4 is null");
         return fromArray(source1, source2, source3, source4).flatMap((Function)Functions.identity(), false, 4);
     }
 
@@ -3331,7 +3331,7 @@ public static <T> Observable<T> mergeDelayError(Iterable<? extends ObservableSou
     @SchedulerSupport(SchedulerSupport.NONE)
     @SuppressWarnings({ "unchecked", "rawtypes" })
     public static <T> Observable<T> mergeDelayError(ObservableSource<? extends ObservableSource<? extends T>> sources) {
-        ObjectHelper.requireNonNull(sources, "sources is null");
+        Objects.requireNonNull(sources, "sources is null");
         return RxJavaPlugins.onAssembly(new ObservableFlatMap(sources, Functions.identity(), true, Integer.MAX_VALUE, bufferSize()));
     }
 
@@ -3368,7 +3368,7 @@ public static <T> Observable<T> mergeDelayError(ObservableSource<? extends Obser
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.NONE)
     public static <T> Observable<T> mergeDelayError(ObservableSource<? extends ObservableSource<? extends T>> sources, int maxConcurrency) {
-        ObjectHelper.requireNonNull(sources, "sources is null");
+        Objects.requireNonNull(sources, "sources is null");
         ObjectHelper.verifyPositive(maxConcurrency, "maxConcurrency");
         return RxJavaPlugins.onAssembly(new ObservableFlatMap(sources, Functions.identity(), true, maxConcurrency, bufferSize()));
     }
@@ -3403,8 +3403,8 @@ public static <T> Observable<T> mergeDelayError(ObservableSource<? extends Obser
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.NONE)
     public static <T> Observable<T> mergeDelayError(ObservableSource<? extends T> source1, ObservableSource<? extends T> source2) {
-        ObjectHelper.requireNonNull(source1, "source1 is null");
-        ObjectHelper.requireNonNull(source2, "source2 is null");
+        Objects.requireNonNull(source1, "source1 is null");
+        Objects.requireNonNull(source2, "source2 is null");
         return fromArray(source1, source2).flatMap((Function)Functions.identity(), true, 2);
     }
 
@@ -3441,9 +3441,9 @@ public static <T> Observable<T> mergeDelayError(ObservableSource<? extends T> so
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.NONE)
     public static <T> Observable<T> mergeDelayError(ObservableSource<? extends T> source1, ObservableSource<? extends T> source2, ObservableSource<? extends T> source3) {
-        ObjectHelper.requireNonNull(source1, "source1 is null");
-        ObjectHelper.requireNonNull(source2, "source2 is null");
-        ObjectHelper.requireNonNull(source3, "source3 is null");
+        Objects.requireNonNull(source1, "source1 is null");
+        Objects.requireNonNull(source2, "source2 is null");
+        Objects.requireNonNull(source3, "source3 is null");
         return fromArray(source1, source2, source3).flatMap((Function)Functions.identity(), true, 3);
     }
 
@@ -3484,10 +3484,10 @@ public static <T> Observable<T> mergeDelayError(ObservableSource<? extends T> so
     public static <T> Observable<T> mergeDelayError(
             ObservableSource<? extends T> source1, ObservableSource<? extends T> source2,
             ObservableSource<? extends T> source3, ObservableSource<? extends T> source4) {
-        ObjectHelper.requireNonNull(source1, "source1 is null");
-        ObjectHelper.requireNonNull(source2, "source2 is null");
-        ObjectHelper.requireNonNull(source3, "source3 is null");
-        ObjectHelper.requireNonNull(source4, "source4 is null");
+        Objects.requireNonNull(source1, "source1 is null");
+        Objects.requireNonNull(source2, "source2 is null");
+        Objects.requireNonNull(source3, "source3 is null");
+        Objects.requireNonNull(source4, "source4 is null");
         return fromArray(source1, source2, source3, source4).flatMap((Function)Functions.identity(), true, 4);
     }
 
@@ -3709,9 +3709,9 @@ public static <T> Single<Boolean> sequenceEqual(ObservableSource<? extends T> so
     @SchedulerSupport(SchedulerSupport.NONE)
     public static <T> Single<Boolean> sequenceEqual(ObservableSource<? extends T> source1, ObservableSource<? extends T> source2,
             BiPredicate<? super T, ? super T> isEqual, int bufferSize) {
-        ObjectHelper.requireNonNull(source1, "source1 is null");
-        ObjectHelper.requireNonNull(source2, "source2 is null");
-        ObjectHelper.requireNonNull(isEqual, "isEqual is null");
+        Objects.requireNonNull(source1, "source1 is null");
+        Objects.requireNonNull(source2, "source2 is null");
+        Objects.requireNonNull(isEqual, "isEqual is null");
         ObjectHelper.verifyPositive(bufferSize, "bufferSize");
         return RxJavaPlugins.onAssembly(new ObservableSequenceEqualSingle<T>(source1, source2, isEqual, bufferSize));
     }
@@ -3775,7 +3775,7 @@ public static <T> Single<Boolean> sequenceEqual(ObservableSource<? extends T> so
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.NONE)
     public static <T> Observable<T> switchOnNext(ObservableSource<? extends ObservableSource<? extends T>> sources, int bufferSize) {
-        ObjectHelper.requireNonNull(sources, "sources is null");
+        Objects.requireNonNull(sources, "sources is null");
         ObjectHelper.verifyPositive(bufferSize, "bufferSize");
         return RxJavaPlugins.onAssembly(new ObservableSwitchMap(sources, Functions.identity(), bufferSize, false));
     }
@@ -3877,7 +3877,7 @@ public static <T> Observable<T> switchOnNextDelayError(ObservableSource<? extend
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.NONE)
     public static <T> Observable<T> switchOnNextDelayError(ObservableSource<? extends ObservableSource<? extends T>> sources, int prefetch) {
-        ObjectHelper.requireNonNull(sources, "sources is null");
+        Objects.requireNonNull(sources, "sources is null");
         ObjectHelper.verifyPositive(prefetch, "prefetch");
         return RxJavaPlugins.onAssembly(new ObservableSwitchMap(sources, Functions.identity(), prefetch, true));
     }
@@ -3930,8 +3930,8 @@ public static Observable<Long> timer(long delay, TimeUnit unit) {
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.CUSTOM)
     public static Observable<Long> timer(long delay, TimeUnit unit, Scheduler scheduler) {
-        ObjectHelper.requireNonNull(unit, "unit is null");
-        ObjectHelper.requireNonNull(scheduler, "scheduler is null");
+        Objects.requireNonNull(unit, "unit is null");
+        Objects.requireNonNull(scheduler, "scheduler is null");
 
         return RxJavaPlugins.onAssembly(new ObservableTimer(Math.max(delay, 0L), unit, scheduler));
     }
@@ -3951,7 +3951,7 @@ public static Observable<Long> timer(long delay, TimeUnit unit, Scheduler schedu
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.NONE)
     public static <T> Observable<T> unsafeCreate(ObservableSource<T> onSubscribe) {
-        ObjectHelper.requireNonNull(onSubscribe, "onSubscribe is null");
+        Objects.requireNonNull(onSubscribe, "onSubscribe is null");
         if (onSubscribe instanceof Observable) {
             throw new IllegalArgumentException("unsafeCreate(Observable) should be upgraded");
         }
@@ -4018,9 +4018,9 @@ public static <T, D> Observable<T> using(Supplier<? extends D> resourceSupplier,
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.NONE)
     public static <T, D> Observable<T> using(Supplier<? extends D> resourceSupplier, Function<? super D, ? extends ObservableSource<? extends T>> sourceSupplier, Consumer<? super D> disposer, boolean eager) {
-        ObjectHelper.requireNonNull(resourceSupplier, "resourceSupplier is null");
-        ObjectHelper.requireNonNull(sourceSupplier, "sourceSupplier is null");
-        ObjectHelper.requireNonNull(disposer, "disposer is null");
+        Objects.requireNonNull(resourceSupplier, "resourceSupplier is null");
+        Objects.requireNonNull(sourceSupplier, "sourceSupplier is null");
+        Objects.requireNonNull(disposer, "disposer is null");
         return RxJavaPlugins.onAssembly(new ObservableUsing<T, D>(resourceSupplier, sourceSupplier, disposer, eager));
     }
 
@@ -4040,7 +4040,7 @@ public static <T, D> Observable<T> using(Supplier<? extends D> resourceSupplier,
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.NONE)
     public static <T> Observable<T> wrap(ObservableSource<T> source) {
-        ObjectHelper.requireNonNull(source, "source is null");
+        Objects.requireNonNull(source, "source is null");
         if (source instanceof Observable) {
             return RxJavaPlugins.onAssembly((Observable<T>)source);
         }
@@ -4095,8 +4095,8 @@ public static <T> Observable<T> wrap(ObservableSource<T> source) {
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.NONE)
     public static <T, R> Observable<R> zip(Iterable<? extends ObservableSource<? extends T>> sources, Function<? super Object[], ? extends R> zipper) {
-        ObjectHelper.requireNonNull(zipper, "zipper is null");
-        ObjectHelper.requireNonNull(sources, "sources is null");
+        Objects.requireNonNull(zipper, "zipper is null");
+        Objects.requireNonNull(sources, "sources is null");
         return RxJavaPlugins.onAssembly(new ObservableZip<T, R>(null, sources, zipper, bufferSize(), false));
     }
 
@@ -4155,8 +4155,8 @@ public static <T, R> Observable<R> zip(Iterable<? extends ObservableSource<? ext
     public static <T, R> Observable<R> zip(Iterable<? extends ObservableSource<? extends T>> sources,
             Function<? super Object[], ? extends R> zipper, boolean delayError,
             int bufferSize) {
-        ObjectHelper.requireNonNull(zipper, "zipper is null");
-        ObjectHelper.requireNonNull(sources, "sources is null");
+        Objects.requireNonNull(zipper, "zipper is null");
+        Objects.requireNonNull(sources, "sources is null");
         ObjectHelper.verifyPositive(bufferSize, "bufferSize");
         return RxJavaPlugins.onAssembly(new ObservableZip<T, R>(null, sources, zipper, bufferSize, delayError));
     }
@@ -4211,8 +4211,8 @@ public static <T, R> Observable<R> zip(Iterable<? extends ObservableSource<? ext
     public static <T1, T2, R> Observable<R> zip(
             ObservableSource<? extends T1> source1, ObservableSource<? extends T2> source2,
             BiFunction<? super T1, ? super T2, ? extends R> zipper) {
-        ObjectHelper.requireNonNull(source1, "source1 is null");
-        ObjectHelper.requireNonNull(source2, "source2 is null");
+        Objects.requireNonNull(source1, "source1 is null");
+        Objects.requireNonNull(source2, "source2 is null");
         return zipArray(Functions.toFunction(zipper), false, bufferSize(), source1, source2);
     }
 
@@ -4267,8 +4267,8 @@ public static <T1, T2, R> Observable<R> zip(
     public static <T1, T2, R> Observable<R> zip(
             ObservableSource<? extends T1> source1, ObservableSource<? extends T2> source2,
             BiFunction<? super T1, ? super T2, ? extends R> zipper, boolean delayError) {
-        ObjectHelper.requireNonNull(source1, "source1 is null");
-        ObjectHelper.requireNonNull(source2, "source2 is null");
+        Objects.requireNonNull(source1, "source1 is null");
+        Objects.requireNonNull(source2, "source2 is null");
         return zipArray(Functions.toFunction(zipper), delayError, bufferSize(), source1, source2);
     }
 
@@ -4324,8 +4324,8 @@ public static <T1, T2, R> Observable<R> zip(
     public static <T1, T2, R> Observable<R> zip(
             ObservableSource<? extends T1> source1, ObservableSource<? extends T2> source2,
             BiFunction<? super T1, ? super T2, ? extends R> zipper, boolean delayError, int bufferSize) {
-        ObjectHelper.requireNonNull(source1, "source1 is null");
-        ObjectHelper.requireNonNull(source2, "source2 is null");
+        Objects.requireNonNull(source1, "source1 is null");
+        Objects.requireNonNull(source2, "source2 is null");
         return zipArray(Functions.toFunction(zipper), delayError, bufferSize, source1, source2);
     }
 
@@ -4383,9 +4383,9 @@ public static <T1, T2, R> Observable<R> zip(
     public static <T1, T2, T3, R> Observable<R> zip(
             ObservableSource<? extends T1> source1, ObservableSource<? extends T2> source2, ObservableSource<? extends T3> source3,
             Function3<? super T1, ? super T2, ? super T3, ? extends R> zipper) {
-        ObjectHelper.requireNonNull(source1, "source1 is null");
-        ObjectHelper.requireNonNull(source2, "source2 is null");
-        ObjectHelper.requireNonNull(source3, "source3 is null");
+        Objects.requireNonNull(source1, "source1 is null");
+        Objects.requireNonNull(source2, "source2 is null");
+        Objects.requireNonNull(source3, "source3 is null");
         return zipArray(Functions.toFunction(zipper), false, bufferSize(), source1, source2, source3);
     }
 
@@ -4447,10 +4447,10 @@ public static <T1, T2, T3, T4, R> Observable<R> zip(
             ObservableSource<? extends T1> source1, ObservableSource<? extends T2> source2, ObservableSource<? extends T3> source3,
             ObservableSource<? extends T4> source4,
             Function4<? super T1, ? super T2, ? super T3, ? super T4, ? extends R> zipper) {
-        ObjectHelper.requireNonNull(source1, "source1 is null");
-        ObjectHelper.requireNonNull(source2, "source2 is null");
-        ObjectHelper.requireNonNull(source3, "source3 is null");
-        ObjectHelper.requireNonNull(source4, "source4 is null");
+        Objects.requireNonNull(source1, "source1 is null");
+        Objects.requireNonNull(source2, "source2 is null");
+        Objects.requireNonNull(source3, "source3 is null");
+        Objects.requireNonNull(source4, "source4 is null");
         return zipArray(Functions.toFunction(zipper), false, bufferSize(), source1, source2, source3, source4);
     }
 
@@ -4515,11 +4515,11 @@ public static <T1, T2, T3, T4, T5, R> Observable<R> zip(
             ObservableSource<? extends T1> source1, ObservableSource<? extends T2> source2, ObservableSource<? extends T3> source3,
             ObservableSource<? extends T4> source4, ObservableSource<? extends T5> source5,
             Function5<? super T1, ? super T2, ? super T3, ? super T4, ? super T5, ? extends R> zipper) {
-        ObjectHelper.requireNonNull(source1, "source1 is null");
-        ObjectHelper.requireNonNull(source2, "source2 is null");
-        ObjectHelper.requireNonNull(source3, "source3 is null");
-        ObjectHelper.requireNonNull(source4, "source4 is null");
-        ObjectHelper.requireNonNull(source5, "source5 is null");
+        Objects.requireNonNull(source1, "source1 is null");
+        Objects.requireNonNull(source2, "source2 is null");
+        Objects.requireNonNull(source3, "source3 is null");
+        Objects.requireNonNull(source4, "source4 is null");
+        Objects.requireNonNull(source5, "source5 is null");
         return zipArray(Functions.toFunction(zipper), false, bufferSize(), source1, source2, source3, source4, source5);
     }
 
@@ -4586,12 +4586,12 @@ public static <T1, T2, T3, T4, T5, T6, R> Observable<R> zip(
             ObservableSource<? extends T1> source1, ObservableSource<? extends T2> source2, ObservableSource<? extends T3> source3,
             ObservableSource<? extends T4> source4, ObservableSource<? extends T5> source5, ObservableSource<? extends T6> source6,
             Function6<? super T1, ? super T2, ? super T3, ? super T4, ? super T5, ? super T6, ? extends R> zipper) {
-        ObjectHelper.requireNonNull(source1, "source1 is null");
-        ObjectHelper.requireNonNull(source2, "source2 is null");
-        ObjectHelper.requireNonNull(source3, "source3 is null");
-        ObjectHelper.requireNonNull(source4, "source4 is null");
-        ObjectHelper.requireNonNull(source5, "source5 is null");
-        ObjectHelper.requireNonNull(source6, "source6 is null");
+        Objects.requireNonNull(source1, "source1 is null");
+        Objects.requireNonNull(source2, "source2 is null");
+        Objects.requireNonNull(source3, "source3 is null");
+        Objects.requireNonNull(source4, "source4 is null");
+        Objects.requireNonNull(source5, "source5 is null");
+        Objects.requireNonNull(source6, "source6 is null");
         return zipArray(Functions.toFunction(zipper), false, bufferSize(), source1, source2, source3, source4, source5, source6);
     }
 
@@ -4662,13 +4662,13 @@ public static <T1, T2, T3, T4, T5, T6, T7, R> Observable<R> zip(
             ObservableSource<? extends T4> source4, ObservableSource<? extends T5> source5, ObservableSource<? extends T6> source6,
             ObservableSource<? extends T7> source7,
             Function7<? super T1, ? super T2, ? super T3, ? super T4, ? super T5, ? super T6, ? super T7, ? extends R> zipper) {
-        ObjectHelper.requireNonNull(source1, "source1 is null");
-        ObjectHelper.requireNonNull(source2, "source2 is null");
-        ObjectHelper.requireNonNull(source3, "source3 is null");
-        ObjectHelper.requireNonNull(source4, "source4 is null");
-        ObjectHelper.requireNonNull(source5, "source5 is null");
-        ObjectHelper.requireNonNull(source6, "source6 is null");
-        ObjectHelper.requireNonNull(source7, "source7 is null");
+        Objects.requireNonNull(source1, "source1 is null");
+        Objects.requireNonNull(source2, "source2 is null");
+        Objects.requireNonNull(source3, "source3 is null");
+        Objects.requireNonNull(source4, "source4 is null");
+        Objects.requireNonNull(source5, "source5 is null");
+        Objects.requireNonNull(source6, "source6 is null");
+        Objects.requireNonNull(source7, "source7 is null");
         return zipArray(Functions.toFunction(zipper), false, bufferSize(), source1, source2, source3, source4, source5, source6, source7);
     }
 
@@ -4742,14 +4742,14 @@ public static <T1, T2, T3, T4, T5, T6, T7, T8, R> Observable<R> zip(
             ObservableSource<? extends T4> source4, ObservableSource<? extends T5> source5, ObservableSource<? extends T6> source6,
             ObservableSource<? extends T7> source7, ObservableSource<? extends T8> source8,
             Function8<? super T1, ? super T2, ? super T3, ? super T4, ? super T5, ? super T6, ? super T7, ? super T8, ? extends R> zipper) {
-        ObjectHelper.requireNonNull(source1, "source1 is null");
-        ObjectHelper.requireNonNull(source2, "source2 is null");
-        ObjectHelper.requireNonNull(source3, "source3 is null");
-        ObjectHelper.requireNonNull(source4, "source4 is null");
-        ObjectHelper.requireNonNull(source5, "source5 is null");
-        ObjectHelper.requireNonNull(source6, "source6 is null");
-        ObjectHelper.requireNonNull(source7, "source7 is null");
-        ObjectHelper.requireNonNull(source8, "source8 is null");
+        Objects.requireNonNull(source1, "source1 is null");
+        Objects.requireNonNull(source2, "source2 is null");
+        Objects.requireNonNull(source3, "source3 is null");
+        Objects.requireNonNull(source4, "source4 is null");
+        Objects.requireNonNull(source5, "source5 is null");
+        Objects.requireNonNull(source6, "source6 is null");
+        Objects.requireNonNull(source7, "source7 is null");
+        Objects.requireNonNull(source8, "source8 is null");
         return zipArray(Functions.toFunction(zipper), false, bufferSize(), source1, source2, source3, source4, source5, source6, source7, source8);
     }
 
@@ -4826,15 +4826,15 @@ public static <T1, T2, T3, T4, T5, T6, T7, T8, T9, R> Observable<R> zip(
             ObservableSource<? extends T4> source4, ObservableSource<? extends T5> source5, ObservableSource<? extends T6> source6,
             ObservableSource<? extends T7> source7, ObservableSource<? extends T8> source8, ObservableSource<? extends T9> source9,
             Function9<? super T1, ? super T2, ? super T3, ? super T4, ? super T5, ? super T6, ? super T7, ? super T8, ? super T9, ? extends R> zipper) {
-        ObjectHelper.requireNonNull(source1, "source1 is null");
-        ObjectHelper.requireNonNull(source2, "source2 is null");
-        ObjectHelper.requireNonNull(source3, "source3 is null");
-        ObjectHelper.requireNonNull(source4, "source4 is null");
-        ObjectHelper.requireNonNull(source5, "source5 is null");
-        ObjectHelper.requireNonNull(source6, "source6 is null");
-        ObjectHelper.requireNonNull(source7, "source7 is null");
-        ObjectHelper.requireNonNull(source8, "source8 is null");
-        ObjectHelper.requireNonNull(source9, "source9 is null");
+        Objects.requireNonNull(source1, "source1 is null");
+        Objects.requireNonNull(source2, "source2 is null");
+        Objects.requireNonNull(source3, "source3 is null");
+        Objects.requireNonNull(source4, "source4 is null");
+        Objects.requireNonNull(source5, "source5 is null");
+        Objects.requireNonNull(source6, "source6 is null");
+        Objects.requireNonNull(source7, "source7 is null");
+        Objects.requireNonNull(source8, "source8 is null");
+        Objects.requireNonNull(source9, "source9 is null");
         return zipArray(Functions.toFunction(zipper), false, bufferSize(), source1, source2, source3, source4, source5, source6, source7, source8, source9);
     }
 
@@ -4895,7 +4895,7 @@ public static <T, R> Observable<R> zipArray(Function<? super Object[], ? extends
         if (sources.length == 0) {
             return empty();
         }
-        ObjectHelper.requireNonNull(zipper, "zipper is null");
+        Objects.requireNonNull(zipper, "zipper is null");
         ObjectHelper.verifyPositive(bufferSize, "bufferSize");
         return RxJavaPlugins.onAssembly(new ObservableZip<T, R>(sources, null, zipper, bufferSize, delayError));
     }
@@ -4923,7 +4923,7 @@ public static <T, R> Observable<R> zipArray(Function<? super Object[], ? extends
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Single<Boolean> all(Predicate<? super T> predicate) {
-        ObjectHelper.requireNonNull(predicate, "predicate is null");
+        Objects.requireNonNull(predicate, "predicate is null");
         return RxJavaPlugins.onAssembly(new ObservableAllSingle<T>(this, predicate));
     }
 
@@ -4948,7 +4948,7 @@ public final Single<Boolean> all(Predicate<? super T> predicate) {
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Observable<T> ambWith(ObservableSource<? extends T> other) {
-        ObjectHelper.requireNonNull(other, "other is null");
+        Objects.requireNonNull(other, "other is null");
         return ambArray(this, other);
     }
 
@@ -4975,7 +4975,7 @@ public final Observable<T> ambWith(ObservableSource<? extends T> other) {
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Single<Boolean> any(Predicate<? super T> predicate) {
-        ObjectHelper.requireNonNull(predicate, "predicate is null");
+        Objects.requireNonNull(predicate, "predicate is null");
         return RxJavaPlugins.onAssembly(new ObservableAnySingle<T>(this, predicate));
     }
 
@@ -5520,7 +5520,7 @@ public final Observable<List<T>> buffer(int count, int skip) {
     public final <U extends Collection<? super T>> Observable<U> buffer(int count, int skip, Supplier<U> bufferSupplier) {
         ObjectHelper.verifyPositive(count, "count");
         ObjectHelper.verifyPositive(skip, "skip");
-        ObjectHelper.requireNonNull(bufferSupplier, "bufferSupplier is null");
+        Objects.requireNonNull(bufferSupplier, "bufferSupplier is null");
         return RxJavaPlugins.onAssembly(new ObservableBuffer<T, U>(this, count, skip, bufferSupplier));
     }
 
@@ -5650,9 +5650,9 @@ public final Observable<List<T>> buffer(long timespan, long timeskip, TimeUnit u
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.CUSTOM)
     public final <U extends Collection<? super T>> Observable<U> buffer(long timespan, long timeskip, TimeUnit unit, Scheduler scheduler, Supplier<U> bufferSupplier) {
-        ObjectHelper.requireNonNull(unit, "unit is null");
-        ObjectHelper.requireNonNull(scheduler, "scheduler is null");
-        ObjectHelper.requireNonNull(bufferSupplier, "bufferSupplier is null");
+        Objects.requireNonNull(unit, "unit is null");
+        Objects.requireNonNull(scheduler, "scheduler is null");
+        Objects.requireNonNull(bufferSupplier, "bufferSupplier is null");
         return RxJavaPlugins.onAssembly(new ObservableBufferTimed<T, U>(this, timespan, timeskip, unit, scheduler, bufferSupplier, Integer.MAX_VALUE, false));
     }
 
@@ -5795,9 +5795,9 @@ public final <U extends Collection<? super T>> Observable<U> buffer(
             Scheduler scheduler, int count,
             Supplier<U> bufferSupplier,
             boolean restartTimerOnMaxSize) {
-        ObjectHelper.requireNonNull(unit, "unit is null");
-        ObjectHelper.requireNonNull(scheduler, "scheduler is null");
-        ObjectHelper.requireNonNull(bufferSupplier, "bufferSupplier is null");
+        Objects.requireNonNull(unit, "unit is null");
+        Objects.requireNonNull(scheduler, "scheduler is null");
+        Objects.requireNonNull(bufferSupplier, "bufferSupplier is null");
         ObjectHelper.verifyPositive(count, "count");
         return RxJavaPlugins.onAssembly(new ObservableBufferTimed<T, U>(this, timespan, timespan, unit, scheduler, bufferSupplier, count, restartTimerOnMaxSize));
     }
@@ -5899,9 +5899,9 @@ public final <TOpening, TClosing, U extends Collection<? super T>> Observable<U>
             ObservableSource<? extends TOpening> openingIndicator,
             Function<? super TOpening, ? extends ObservableSource<? extends TClosing>> closingIndicator,
             Supplier<U> bufferSupplier) {
-        ObjectHelper.requireNonNull(openingIndicator, "openingIndicator is null");
-        ObjectHelper.requireNonNull(closingIndicator, "closingIndicator is null");
-        ObjectHelper.requireNonNull(bufferSupplier, "bufferSupplier is null");
+        Objects.requireNonNull(openingIndicator, "openingIndicator is null");
+        Objects.requireNonNull(closingIndicator, "closingIndicator is null");
+        Objects.requireNonNull(bufferSupplier, "bufferSupplier is null");
         return RxJavaPlugins.onAssembly(new ObservableBufferBoundary<T, U, TOpening, TClosing>(this, openingIndicator, closingIndicator, bufferSupplier));
     }
 
@@ -5999,8 +5999,8 @@ public final <B> Observable<List<T>> buffer(ObservableSource<B> boundary, final
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <B, U extends Collection<? super T>> Observable<U> buffer(ObservableSource<B> boundary, Supplier<U> bufferSupplier) {
-        ObjectHelper.requireNonNull(boundary, "boundary is null");
-        ObjectHelper.requireNonNull(bufferSupplier, "bufferSupplier is null");
+        Objects.requireNonNull(boundary, "boundary is null");
+        Objects.requireNonNull(bufferSupplier, "bufferSupplier is null");
         return RxJavaPlugins.onAssembly(new ObservableBufferExactBoundary<T, U, B>(this, boundary, bufferSupplier));
     }
 
@@ -6138,7 +6138,7 @@ public final Observable<T> cacheWithInitialCapacity(int initialCapacity) {
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <U> Observable<U> cast(final Class<U> clazz) {
-        ObjectHelper.requireNonNull(clazz, "clazz is null");
+        Objects.requireNonNull(clazz, "clazz is null");
         return map(Functions.castFunction(clazz));
     }
 
@@ -6171,8 +6171,8 @@ public final <U> Observable<U> cast(final Class<U> clazz) {
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <U> Single<U> collect(Supplier<? extends U> initialValueSupplier, BiConsumer<? super U, ? super T> collector) {
-        ObjectHelper.requireNonNull(initialValueSupplier, "initialValueSupplier is null");
-        ObjectHelper.requireNonNull(collector, "collector is null");
+        Objects.requireNonNull(initialValueSupplier, "initialValueSupplier is null");
+        Objects.requireNonNull(collector, "collector is null");
         return RxJavaPlugins.onAssembly(new ObservableCollectSingle<T, U>(this, initialValueSupplier, collector));
     }
 
@@ -6205,7 +6205,7 @@ public final <U> Single<U> collect(Supplier<? extends U> initialValueSupplier, B
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <U> Single<U> collectInto(final U initialValue, BiConsumer<? super U, ? super T> collector) {
-        ObjectHelper.requireNonNull(initialValue, "initialValue is null");
+        Objects.requireNonNull(initialValue, "initialValue is null");
         return collect(Functions.justSupplier(initialValue), collector);
     }
 
@@ -6232,7 +6232,7 @@ public final <U> Single<U> collectInto(final U initialValue, BiConsumer<? super
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <R> Observable<R> compose(ObservableTransformer<? super T, ? extends R> composer) {
-        return wrap(((ObservableTransformer<T, R>) ObjectHelper.requireNonNull(composer, "composer is null")).apply(this));
+        return wrap(((ObservableTransformer<T, R>) Objects.requireNonNull(composer, "composer is null")).apply(this));
     }
 
     /**
@@ -6294,7 +6294,7 @@ public final <R> Observable<R> concatMap(Function<? super T, ? extends Observabl
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <R> Observable<R> concatMap(Function<? super T, ? extends ObservableSource<? extends R>> mapper, int prefetch) {
-        ObjectHelper.requireNonNull(mapper, "mapper is null");
+        Objects.requireNonNull(mapper, "mapper is null");
         ObjectHelper.verifyPositive(prefetch, "prefetch");
         if (this instanceof ScalarSupplier) {
             @SuppressWarnings("unchecked")
@@ -6336,9 +6336,9 @@ public final <R> Observable<R> concatMap(Function<? super T, ? extends Observabl
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.CUSTOM)
     public final <R> Observable<R> concatMap(Function<? super T, ? extends ObservableSource<? extends R>> mapper, int prefetch, Scheduler scheduler) {
-        ObjectHelper.requireNonNull(mapper, "mapper is null");
+        Objects.requireNonNull(mapper, "mapper is null");
         ObjectHelper.verifyPositive(prefetch, "prefetch");
-        ObjectHelper.requireNonNull(scheduler, "scheduler is null");
+        Objects.requireNonNull(scheduler, "scheduler is null");
         return RxJavaPlugins.onAssembly(new ObservableConcatMapScheduler<T, R>(this, mapper, prefetch, ErrorMode.IMMEDIATE, scheduler));
     }
 
@@ -6399,7 +6399,7 @@ public final <R> Observable<R> concatMapDelayError(Function<? super T, ? extends
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <R> Observable<R> concatMapDelayError(Function<? super T, ? extends ObservableSource<? extends R>> mapper,
             boolean tillTheEnd, int prefetch) {
-        ObjectHelper.requireNonNull(mapper, "mapper is null");
+        Objects.requireNonNull(mapper, "mapper is null");
         ObjectHelper.verifyPositive(prefetch, "prefetch");
         if (this instanceof ScalarSupplier) {
             @SuppressWarnings("unchecked")
@@ -6441,9 +6441,9 @@ public final <R> Observable<R> concatMapDelayError(Function<? super T, ? extends
     @SchedulerSupport(SchedulerSupport.CUSTOM)
     public final <R> Observable<R> concatMapDelayError(Function<? super T, ? extends ObservableSource<? extends R>> mapper,
             boolean tillTheEnd, int prefetch, Scheduler scheduler) {
-        ObjectHelper.requireNonNull(mapper, "mapper is null");
+        Objects.requireNonNull(mapper, "mapper is null");
         ObjectHelper.verifyPositive(prefetch, "prefetch");
-        ObjectHelper.requireNonNull(scheduler, "scheduler is null");
+        Objects.requireNonNull(scheduler, "scheduler is null");
         return RxJavaPlugins.onAssembly(new ObservableConcatMapScheduler<T, R>(this, mapper, prefetch, tillTheEnd ? ErrorMode.END : ErrorMode.BOUNDARY, scheduler));
     }
 
@@ -6497,7 +6497,7 @@ public final <R> Observable<R> concatMapEager(Function<? super T, ? extends Obse
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <R> Observable<R> concatMapEager(Function<? super T, ? extends ObservableSource<? extends R>> mapper,
             int maxConcurrency, int prefetch) {
-        ObjectHelper.requireNonNull(mapper, "mapper is null");
+        Objects.requireNonNull(mapper, "mapper is null");
         ObjectHelper.verifyPositive(maxConcurrency, "maxConcurrency");
         ObjectHelper.verifyPositive(prefetch, "prefetch");
         return RxJavaPlugins.onAssembly(new ObservableConcatMapEager<T, R>(this, mapper, ErrorMode.IMMEDIATE, maxConcurrency, prefetch));
@@ -6562,7 +6562,7 @@ public final <R> Observable<R> concatMapEagerDelayError(Function<? super T, ? ex
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <R> Observable<R> concatMapEagerDelayError(Function<? super T, ? extends ObservableSource<? extends R>> mapper,
             boolean tillTheEnd, int maxConcurrency, int prefetch) {
-        ObjectHelper.requireNonNull(mapper, "mapper is null");
+        Objects.requireNonNull(mapper, "mapper is null");
         ObjectHelper.verifyPositive(maxConcurrency, "maxConcurrency");
         ObjectHelper.verifyPositive(prefetch, "prefetch");
         return RxJavaPlugins.onAssembly(new ObservableConcatMapEager<T, R>(this, mapper, tillTheEnd ? ErrorMode.END : ErrorMode.BOUNDARY, maxConcurrency, prefetch));
@@ -6611,7 +6611,7 @@ public final Completable concatMapCompletable(Function<? super T, ? extends Comp
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Completable concatMapCompletable(Function<? super T, ? extends CompletableSource> mapper, int capacityHint) {
-        ObjectHelper.requireNonNull(mapper, "mapper is null");
+        Objects.requireNonNull(mapper, "mapper is null");
         ObjectHelper.verifyPositive(capacityHint, "capacityHint");
         return RxJavaPlugins.onAssembly(new ObservableConcatMapCompletable<T>(this, mapper, ErrorMode.IMMEDIATE, capacityHint));
     }
@@ -6701,7 +6701,7 @@ public final Completable concatMapCompletableDelayError(Function<? super T, ? ex
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Completable concatMapCompletableDelayError(Function<? super T, ? extends CompletableSource> mapper, boolean tillTheEnd, int prefetch) {
-        ObjectHelper.requireNonNull(mapper, "mapper is null");
+        Objects.requireNonNull(mapper, "mapper is null");
         ObjectHelper.verifyPositive(prefetch, "prefetch");
         return RxJavaPlugins.onAssembly(new ObservableConcatMapCompletable<T>(this, mapper, tillTheEnd ? ErrorMode.END : ErrorMode.BOUNDARY, prefetch));
     }
@@ -6729,7 +6729,7 @@ public final Completable concatMapCompletableDelayError(Function<? super T, ? ex
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <U> Observable<U> concatMapIterable(final Function<? super T, ? extends Iterable<? extends U>> mapper) {
-        ObjectHelper.requireNonNull(mapper, "mapper is null");
+        Objects.requireNonNull(mapper, "mapper is null");
         return RxJavaPlugins.onAssembly(new ObservableFlattenIterable<T, U>(this, mapper));
     }
 
@@ -6758,7 +6758,7 @@ public final <U> Observable<U> concatMapIterable(final Function<? super T, ? ext
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <U> Observable<U> concatMapIterable(final Function<? super T, ? extends Iterable<? extends U>> mapper, int prefetch) {
-        ObjectHelper.requireNonNull(mapper, "mapper is null");
+        Objects.requireNonNull(mapper, "mapper is null");
         ObjectHelper.verifyPositive(prefetch, "prefetch");
         return concatMap(ObservableInternalHelper.flatMapIntoIterable(mapper), prefetch);
     }
@@ -6816,7 +6816,7 @@ public final <R> Observable<R> concatMapMaybe(Function<? super T, ? extends Mayb
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <R> Observable<R> concatMapMaybe(Function<? super T, ? extends MaybeSource<? extends R>> mapper, int prefetch) {
-        ObjectHelper.requireNonNull(mapper, "mapper is null");
+        Objects.requireNonNull(mapper, "mapper is null");
         ObjectHelper.verifyPositive(prefetch, "prefetch");
         return RxJavaPlugins.onAssembly(new ObservableConcatMapMaybe<T, R>(this, mapper, ErrorMode.IMMEDIATE, prefetch));
     }
@@ -6911,7 +6911,7 @@ public final <R> Observable<R> concatMapMaybeDelayError(Function<? super T, ? ex
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <R> Observable<R> concatMapMaybeDelayError(Function<? super T, ? extends MaybeSource<? extends R>> mapper, boolean tillTheEnd, int prefetch) {
-        ObjectHelper.requireNonNull(mapper, "mapper is null");
+        Objects.requireNonNull(mapper, "mapper is null");
         ObjectHelper.verifyPositive(prefetch, "prefetch");
         return RxJavaPlugins.onAssembly(new ObservableConcatMapMaybe<T, R>(this, mapper, tillTheEnd ? ErrorMode.END : ErrorMode.BOUNDARY, prefetch));
     }
@@ -6969,7 +6969,7 @@ public final <R> Observable<R> concatMapSingle(Function<? super T, ? extends Sin
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <R> Observable<R> concatMapSingle(Function<? super T, ? extends SingleSource<? extends R>> mapper, int prefetch) {
-        ObjectHelper.requireNonNull(mapper, "mapper is null");
+        Objects.requireNonNull(mapper, "mapper is null");
         ObjectHelper.verifyPositive(prefetch, "prefetch");
         return RxJavaPlugins.onAssembly(new ObservableConcatMapSingle<T, R>(this, mapper, ErrorMode.IMMEDIATE, prefetch));
     }
@@ -7064,7 +7064,7 @@ public final <R> Observable<R> concatMapSingleDelayError(Function<? super T, ? e
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <R> Observable<R> concatMapSingleDelayError(Function<? super T, ? extends SingleSource<? extends R>> mapper, boolean tillTheEnd, int prefetch) {
-        ObjectHelper.requireNonNull(mapper, "mapper is null");
+        Objects.requireNonNull(mapper, "mapper is null");
         ObjectHelper.verifyPositive(prefetch, "prefetch");
         return RxJavaPlugins.onAssembly(new ObservableConcatMapSingle<T, R>(this, mapper, tillTheEnd ? ErrorMode.END : ErrorMode.BOUNDARY, prefetch));
     }
@@ -7088,7 +7088,7 @@ public final <R> Observable<R> concatMapSingleDelayError(Function<? super T, ? e
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Observable<T> concatWith(ObservableSource<? extends T> other) {
-        ObjectHelper.requireNonNull(other, "other is null");
+        Objects.requireNonNull(other, "other is null");
         return concat(this, other);
     }
 
@@ -7109,7 +7109,7 @@ public final Observable<T> concatWith(ObservableSource<? extends T> other) {
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Observable<T> concatWith(@NonNull SingleSource<? extends T> other) {
-        ObjectHelper.requireNonNull(other, "other is null");
+        Objects.requireNonNull(other, "other is null");
         return RxJavaPlugins.onAssembly(new ObservableConcatWithSingle<T>(this, other));
     }
 
@@ -7130,7 +7130,7 @@ public final Observable<T> concatWith(@NonNull SingleSource<? extends T> other)
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Observable<T> concatWith(@NonNull MaybeSource<? extends T> other) {
-        ObjectHelper.requireNonNull(other, "other is null");
+        Objects.requireNonNull(other, "other is null");
         return RxJavaPlugins.onAssembly(new ObservableConcatWithMaybe<T>(this, other));
     }
 
@@ -7151,7 +7151,7 @@ public final Observable<T> concatWith(@NonNull MaybeSource<? extends T> other) {
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Observable<T> concatWith(@NonNull CompletableSource other) {
-        ObjectHelper.requireNonNull(other, "other is null");
+        Objects.requireNonNull(other, "other is null");
         return RxJavaPlugins.onAssembly(new ObservableConcatWithCompletable<T>(this, other));
     }
 
@@ -7174,7 +7174,7 @@ public final Observable<T> concatWith(@NonNull CompletableSource other) {
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Single<Boolean> contains(final Object element) {
-        ObjectHelper.requireNonNull(element, "element is null");
+        Objects.requireNonNull(element, "element is null");
         return any(Functions.equalsWith(element));
     }
 
@@ -7227,7 +7227,7 @@ public final Single<Long> count() {
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <U> Observable<T> debounce(Function<? super T, ? extends ObservableSource<U>> debounceSelector) {
-        ObjectHelper.requireNonNull(debounceSelector, "debounceSelector is null");
+        Objects.requireNonNull(debounceSelector, "debounceSelector is null");
         return RxJavaPlugins.onAssembly(new ObservableDebounce<T, U>(this, debounceSelector));
     }
 
@@ -7306,8 +7306,8 @@ public final Observable<T> debounce(long timeout, TimeUnit unit) {
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.CUSTOM)
     public final Observable<T> debounce(long timeout, TimeUnit unit, Scheduler scheduler) {
-        ObjectHelper.requireNonNull(unit, "unit is null");
-        ObjectHelper.requireNonNull(scheduler, "scheduler is null");
+        Objects.requireNonNull(unit, "unit is null");
+        Objects.requireNonNull(scheduler, "scheduler is null");
         return RxJavaPlugins.onAssembly(new ObservableDebounceTimed<T>(this, timeout, unit, scheduler));
     }
 
@@ -7330,7 +7330,7 @@ public final Observable<T> debounce(long timeout, TimeUnit unit, Scheduler sched
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Observable<T> defaultIfEmpty(T defaultItem) {
-        ObjectHelper.requireNonNull(defaultItem, "defaultItem is null");
+        Objects.requireNonNull(defaultItem, "defaultItem is null");
         return switchIfEmpty(just(defaultItem));
     }
 
@@ -7360,7 +7360,7 @@ public final Observable<T> defaultIfEmpty(T defaultItem) {
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <U> Observable<T> delay(final Function<? super T, ? extends ObservableSource<U>> itemDelay) {
-        ObjectHelper.requireNonNull(itemDelay, "itemDelay is null");
+        Objects.requireNonNull(itemDelay, "itemDelay is null");
         return flatMap(ObservableInternalHelper.itemDelay(itemDelay));
     }
 
@@ -7463,8 +7463,8 @@ public final Observable<T> delay(long delay, TimeUnit unit, Scheduler scheduler)
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.CUSTOM)
     public final Observable<T> delay(long delay, TimeUnit unit, Scheduler scheduler, boolean delayError) {
-        ObjectHelper.requireNonNull(unit, "unit is null");
-        ObjectHelper.requireNonNull(scheduler, "scheduler is null");
+        Objects.requireNonNull(unit, "unit is null");
+        Objects.requireNonNull(scheduler, "scheduler is null");
 
         return RxJavaPlugins.onAssembly(new ObservableDelay<T>(this, delay, unit, scheduler, delayError));
     }
@@ -7524,7 +7524,7 @@ public final <U, V> Observable<T> delay(ObservableSource<U> subscriptionDelay,
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <U> Observable<T> delaySubscription(ObservableSource<U> other) {
-        ObjectHelper.requireNonNull(other, "other is null");
+        Objects.requireNonNull(other, "other is null");
         return RxJavaPlugins.onAssembly(new ObservableDelaySubscriptionOther<T, U>(this, other));
     }
 
@@ -7626,7 +7626,7 @@ public final Observable<T> delaySubscription(long delay, TimeUnit unit, Schedule
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <R> Observable<R> dematerialize(Function<? super T, Notification<R>> selector) {
-        ObjectHelper.requireNonNull(selector, "selector is null");
+        Objects.requireNonNull(selector, "selector is null");
         return RxJavaPlugins.onAssembly(new ObservableDematerialize<T, R>(this, selector));
     }
 
@@ -7735,8 +7735,8 @@ public final <K> Observable<T> distinct(Function<? super T, K> keySelector) {
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <K> Observable<T> distinct(Function<? super T, K> keySelector, Supplier<? extends Collection<? super K>> collectionSupplier) {
-        ObjectHelper.requireNonNull(keySelector, "keySelector is null");
-        ObjectHelper.requireNonNull(collectionSupplier, "collectionSupplier is null");
+        Objects.requireNonNull(keySelector, "keySelector is null");
+        Objects.requireNonNull(collectionSupplier, "collectionSupplier is null");
         return RxJavaPlugins.onAssembly(new ObservableDistinct<T, K>(this, keySelector, collectionSupplier));
     }
 
@@ -7816,7 +7816,7 @@ public final Observable<T> distinctUntilChanged() {
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <K> Observable<T> distinctUntilChanged(Function<? super T, K> keySelector) {
-        ObjectHelper.requireNonNull(keySelector, "keySelector is null");
+        Objects.requireNonNull(keySelector, "keySelector is null");
         return RxJavaPlugins.onAssembly(new ObservableDistinctUntilChanged<T, K>(this, keySelector, ObjectHelper.equalsPredicate()));
     }
 
@@ -7850,7 +7850,7 @@ public final <K> Observable<T> distinctUntilChanged(Function<? super T, K> keySe
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Observable<T> distinctUntilChanged(BiPredicate<? super T, ? super T> comparer) {
-        ObjectHelper.requireNonNull(comparer, "comparer is null");
+        Objects.requireNonNull(comparer, "comparer is null");
         return RxJavaPlugins.onAssembly(new ObservableDistinctUntilChanged<T, T>(this, Functions.<T>identity(), comparer));
     }
 
@@ -7874,7 +7874,7 @@ public final Observable<T> distinctUntilChanged(BiPredicate<? super T, ? super T
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Observable<T> doAfterNext(Consumer<? super T> onAfterNext) {
-        ObjectHelper.requireNonNull(onAfterNext, "onAfterNext is null");
+        Objects.requireNonNull(onAfterNext, "onAfterNext is null");
         return RxJavaPlugins.onAssembly(new ObservableDoAfterNext<T>(this, onAfterNext));
     }
 
@@ -7898,7 +7898,7 @@ public final Observable<T> doAfterNext(Consumer<? super T> onAfterNext) {
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Observable<T> doAfterTerminate(Action onFinally) {
-        ObjectHelper.requireNonNull(onFinally, "onFinally is null");
+        Objects.requireNonNull(onFinally, "onFinally is null");
         return doOnEach(Functions.emptyConsumer(), Functions.emptyConsumer(), Functions.EMPTY_ACTION, onFinally);
     }
 
@@ -7925,7 +7925,7 @@ public final Observable<T> doAfterTerminate(Action onFinally) {
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Observable<T> doFinally(Action onFinally) {
-        ObjectHelper.requireNonNull(onFinally, "onFinally is null");
+        Objects.requireNonNull(onFinally, "onFinally is null");
         return RxJavaPlugins.onAssembly(new ObservableDoFinally<T>(this, onFinally));
     }
 
@@ -7992,10 +7992,10 @@ public final Observable<T> doOnComplete(Action onComplete) {
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.NONE)
     private Observable<T> doOnEach(Consumer<? super T> onNext, Consumer<? super Throwable> onError, Action onComplete, Action onAfterTerminate) {
-        ObjectHelper.requireNonNull(onNext, "onNext is null");
-        ObjectHelper.requireNonNull(onError, "onError is null");
-        ObjectHelper.requireNonNull(onComplete, "onComplete is null");
-        ObjectHelper.requireNonNull(onAfterTerminate, "onAfterTerminate is null");
+        Objects.requireNonNull(onNext, "onNext is null");
+        Objects.requireNonNull(onError, "onError is null");
+        Objects.requireNonNull(onComplete, "onComplete is null");
+        Objects.requireNonNull(onAfterTerminate, "onAfterTerminate is null");
         return RxJavaPlugins.onAssembly(new ObservableDoOnEach<T>(this, onNext, onError, onComplete, onAfterTerminate));
     }
 
@@ -8016,7 +8016,7 @@ private Observable<T> doOnEach(Consumer<? super T> onNext, Consumer<? super Thro
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Observable<T> doOnEach(final Consumer<? super Notification<T>> onNotification) {
-        ObjectHelper.requireNonNull(onNotification, "onNotification is null");
+        Objects.requireNonNull(onNotification, "onNotification is null");
         return doOnEach(
                 Functions.notificationOnNext(onNotification),
                 Functions.notificationOnError(onNotification),
@@ -8048,7 +8048,7 @@ public final Observable<T> doOnEach(final Consumer<? super Notification<T>> onNo
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Observable<T> doOnEach(final Observer<? super T> observer) {
-        ObjectHelper.requireNonNull(observer, "observer is null");
+        Objects.requireNonNull(observer, "observer is null");
         return doOnEach(
                 ObservableInternalHelper.observerOnNext(observer),
                 ObservableInternalHelper.observerOnError(observer),
@@ -8099,8 +8099,8 @@ public final Observable<T> doOnError(Consumer<? super Throwable> onError) {
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Observable<T> doOnLifecycle(final Consumer<? super Disposable> onSubscribe, final Action onDispose) {
-        ObjectHelper.requireNonNull(onSubscribe, "onSubscribe is null");
-        ObjectHelper.requireNonNull(onDispose, "onDispose is null");
+        Objects.requireNonNull(onSubscribe, "onSubscribe is null");
+        Objects.requireNonNull(onDispose, "onDispose is null");
         return RxJavaPlugins.onAssembly(new ObservableDoOnLifecycle<T>(this, onSubscribe, onDispose));
     }
 
@@ -8169,7 +8169,7 @@ public final Observable<T> doOnSubscribe(Consumer<? super Disposable> onSubscrib
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Observable<T> doOnTerminate(final Action onTerminate) {
-        ObjectHelper.requireNonNull(onTerminate, "onTerminate is null");
+        Objects.requireNonNull(onTerminate, "onTerminate is null");
         return doOnEach(Functions.emptyConsumer(),
                 Functions.actionConsumer(onTerminate), onTerminate,
                 Functions.EMPTY_ACTION);
@@ -8228,7 +8228,7 @@ public final Single<T> elementAt(long index, T defaultItem) {
         if (index < 0) {
             throw new IndexOutOfBoundsException("index >= 0 required but it was " + index);
         }
-        ObjectHelper.requireNonNull(defaultItem, "defaultItem is null");
+        Objects.requireNonNull(defaultItem, "defaultItem is null");
         return RxJavaPlugins.onAssembly(new ObservableElementAtSingle<T>(this, index, defaultItem));
     }
 
@@ -8278,7 +8278,7 @@ public final Single<T> elementAtOrError(long index) {
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Observable<T> filter(Predicate<? super T> predicate) {
-        ObjectHelper.requireNonNull(predicate, "predicate is null");
+        Objects.requireNonNull(predicate, "predicate is null");
         return RxJavaPlugins.onAssembly(new ObservableFilter<T>(this, predicate));
     }
 
@@ -8462,7 +8462,7 @@ public final <R> Observable<R> flatMap(Function<? super T, ? extends ObservableS
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <R> Observable<R> flatMap(Function<? super T, ? extends ObservableSource<? extends R>> mapper,
             boolean delayErrors, int maxConcurrency, int bufferSize) {
-        ObjectHelper.requireNonNull(mapper, "mapper is null");
+        Objects.requireNonNull(mapper, "mapper is null");
         ObjectHelper.verifyPositive(maxConcurrency, "maxConcurrency");
         ObjectHelper.verifyPositive(bufferSize, "bufferSize");
         if (this instanceof ScalarSupplier) {
@@ -8506,9 +8506,9 @@ public final <R> Observable<R> flatMap(
             Function<? super T, ? extends ObservableSource<? extends R>> onNextMapper,
             Function<? super Throwable, ? extends ObservableSource<? extends R>> onErrorMapper,
             Supplier<? extends ObservableSource<? extends R>> onCompleteSupplier) {
-        ObjectHelper.requireNonNull(onNextMapper, "onNextMapper is null");
-        ObjectHelper.requireNonNull(onErrorMapper, "onErrorMapper is null");
-        ObjectHelper.requireNonNull(onCompleteSupplier, "onCompleteSupplier is null");
+        Objects.requireNonNull(onNextMapper, "onNextMapper is null");
+        Objects.requireNonNull(onErrorMapper, "onErrorMapper is null");
+        Objects.requireNonNull(onCompleteSupplier, "onCompleteSupplier is null");
         return merge(new ObservableMapNotification<T, R>(this, onNextMapper, onErrorMapper, onCompleteSupplier));
     }
 
@@ -8547,9 +8547,9 @@ public final <R> Observable<R> flatMap(
             Function<Throwable, ? extends ObservableSource<? extends R>> onErrorMapper,
             Supplier<? extends ObservableSource<? extends R>> onCompleteSupplier,
             int maxConcurrency) {
-        ObjectHelper.requireNonNull(onNextMapper, "onNextMapper is null");
-        ObjectHelper.requireNonNull(onErrorMapper, "onErrorMapper is null");
-        ObjectHelper.requireNonNull(onCompleteSupplier, "onCompleteSupplier is null");
+        Objects.requireNonNull(onNextMapper, "onNextMapper is null");
+        Objects.requireNonNull(onErrorMapper, "onErrorMapper is null");
+        Objects.requireNonNull(onCompleteSupplier, "onCompleteSupplier is null");
         return merge(new ObservableMapNotification<T, R>(this, onNextMapper, onErrorMapper, onCompleteSupplier), maxConcurrency);
     }
 
@@ -8719,8 +8719,8 @@ public final <U, R> Observable<R> flatMap(Function<? super T, ? extends Observab
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <U, R> Observable<R> flatMap(final Function<? super T, ? extends ObservableSource<? extends U>> mapper,
             final BiFunction<? super T, ? super U, ? extends R> combiner, boolean delayErrors, int maxConcurrency, int bufferSize) {
-        ObjectHelper.requireNonNull(mapper, "mapper is null");
-        ObjectHelper.requireNonNull(combiner, "combiner is null");
+        Objects.requireNonNull(mapper, "mapper is null");
+        Objects.requireNonNull(combiner, "combiner is null");
         return flatMap(ObservableInternalHelper.flatMapWithCombiner(mapper, combiner), delayErrors, maxConcurrency, bufferSize);
     }
 
@@ -8793,7 +8793,7 @@ public final Completable flatMapCompletable(Function<? super T, ? extends Comple
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Completable flatMapCompletable(Function<? super T, ? extends CompletableSource> mapper, boolean delayErrors) {
-        ObjectHelper.requireNonNull(mapper, "mapper is null");
+        Objects.requireNonNull(mapper, "mapper is null");
         return RxJavaPlugins.onAssembly(new ObservableFlatMapCompletableCompletable<T>(this, mapper, delayErrors));
     }
 
@@ -8819,7 +8819,7 @@ public final Completable flatMapCompletable(Function<? super T, ? extends Comple
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <U> Observable<U> flatMapIterable(final Function<? super T, ? extends Iterable<? extends U>> mapper) {
-        ObjectHelper.requireNonNull(mapper, "mapper is null");
+        Objects.requireNonNull(mapper, "mapper is null");
         return RxJavaPlugins.onAssembly(new ObservableFlattenIterable<T, U>(this, mapper));
     }
 
@@ -8851,8 +8851,8 @@ public final <U> Observable<U> flatMapIterable(final Function<? super T, ? exten
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <U, V> Observable<V> flatMapIterable(final Function<? super T, ? extends Iterable<? extends U>> mapper,
             BiFunction<? super T, ? super U, ? extends V> resultSelector) {
-        ObjectHelper.requireNonNull(mapper, "mapper is null");
-        ObjectHelper.requireNonNull(resultSelector, "resultSelector is null");
+        Objects.requireNonNull(mapper, "mapper is null");
+        Objects.requireNonNull(resultSelector, "resultSelector is null");
         return flatMap(ObservableInternalHelper.flatMapIntoIterable(mapper), resultSelector, false, bufferSize(), bufferSize());
     }
 
@@ -8894,7 +8894,7 @@ public final <R> Observable<R> flatMapMaybe(Function<? super T, ? extends MaybeS
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <R> Observable<R> flatMapMaybe(Function<? super T, ? extends MaybeSource<? extends R>> mapper, boolean delayErrors) {
-        ObjectHelper.requireNonNull(mapper, "mapper is null");
+        Objects.requireNonNull(mapper, "mapper is null");
         return RxJavaPlugins.onAssembly(new ObservableFlatMapMaybe<T, R>(this, mapper, delayErrors));
     }
 
@@ -8936,7 +8936,7 @@ public final <R> Observable<R> flatMapSingle(Function<? super T, ? extends Singl
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <R> Observable<R> flatMapSingle(Function<? super T, ? extends SingleSource<? extends R>> mapper, boolean delayErrors) {
-        ObjectHelper.requireNonNull(mapper, "mapper is null");
+        Objects.requireNonNull(mapper, "mapper is null");
         return RxJavaPlugins.onAssembly(new ObservableFlatMapSingle<T, R>(this, mapper, delayErrors));
     }
 
@@ -9044,9 +9044,9 @@ public final Disposable forEachWhile(Predicate<? super T> onNext, Consumer<? sup
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Disposable forEachWhile(final Predicate<? super T> onNext, Consumer<? super Throwable> onError,
             final Action onComplete) {
-        ObjectHelper.requireNonNull(onNext, "onNext is null");
-        ObjectHelper.requireNonNull(onError, "onError is null");
-        ObjectHelper.requireNonNull(onComplete, "onComplete is null");
+        Objects.requireNonNull(onNext, "onNext is null");
+        Objects.requireNonNull(onError, "onError is null");
+        Objects.requireNonNull(onComplete, "onComplete is null");
 
         ForEachWhileObserver<T> o = new ForEachWhileObserver<T>(onNext, onError, onComplete);
         subscribe(o);
@@ -9274,8 +9274,8 @@ public final <K, V> Observable<GroupedObservable<K, V>> groupBy(Function<? super
     public final <K, V> Observable<GroupedObservable<K, V>> groupBy(Function<? super T, ? extends K> keySelector,
             Function<? super T, ? extends V> valueSelector,
             boolean delayError, int bufferSize) {
-        ObjectHelper.requireNonNull(keySelector, "keySelector is null");
-        ObjectHelper.requireNonNull(valueSelector, "valueSelector is null");
+        Objects.requireNonNull(keySelector, "keySelector is null");
+        Objects.requireNonNull(valueSelector, "valueSelector is null");
         ObjectHelper.verifyPositive(bufferSize, "bufferSize");
 
         return RxJavaPlugins.onAssembly(new ObservableGroupBy<T, K, V>(this, keySelector, valueSelector, bufferSize, delayError));
@@ -9320,10 +9320,10 @@ public final <TRight, TLeftEnd, TRightEnd, R> Observable<R> groupJoin(
             Function<? super TRight, ? extends ObservableSource<TRightEnd>> rightEnd,
             BiFunction<? super T, ? super Observable<TRight>, ? extends R> resultSelector
                     ) {
-        ObjectHelper.requireNonNull(other, "other is null");
-        ObjectHelper.requireNonNull(leftEnd, "leftEnd is null");
-        ObjectHelper.requireNonNull(rightEnd, "rightEnd is null");
-        ObjectHelper.requireNonNull(resultSelector, "resultSelector is null");
+        Objects.requireNonNull(other, "other is null");
+        Objects.requireNonNull(leftEnd, "leftEnd is null");
+        Objects.requireNonNull(rightEnd, "rightEnd is null");
+        Objects.requireNonNull(resultSelector, "resultSelector is null");
         return RxJavaPlugins.onAssembly(new ObservableGroupJoin<T, TRight, TLeftEnd, TRightEnd, R>(
                 this, other, leftEnd, rightEnd, resultSelector));
     }
@@ -9427,10 +9427,10 @@ public final <TRight, TLeftEnd, TRightEnd, R> Observable<R> join(
             Function<? super TRight, ? extends ObservableSource<TRightEnd>> rightEnd,
             BiFunction<? super T, ? super TRight, ? extends R> resultSelector
                     ) {
-        ObjectHelper.requireNonNull(other, "other is null");
-        ObjectHelper.requireNonNull(leftEnd, "leftEnd is null");
-        ObjectHelper.requireNonNull(rightEnd, "rightEnd is null");
-        ObjectHelper.requireNonNull(resultSelector, "resultSelector is null");
+        Objects.requireNonNull(other, "other is null");
+        Objects.requireNonNull(leftEnd, "leftEnd is null");
+        Objects.requireNonNull(rightEnd, "rightEnd is null");
+        Objects.requireNonNull(resultSelector, "resultSelector is null");
         return RxJavaPlugins.onAssembly(new ObservableJoin<T, TRight, TLeftEnd, TRightEnd, R>(
                 this, other, leftEnd, rightEnd, resultSelector));
     }
@@ -9474,7 +9474,7 @@ public final Maybe<T> lastElement() {
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Single<T> last(T defaultItem) {
-        ObjectHelper.requireNonNull(defaultItem, "defaultItem is null");
+        Objects.requireNonNull(defaultItem, "defaultItem is null");
         return RxJavaPlugins.onAssembly(new ObservableLastSingle<T>(this, defaultItem));
     }
 
@@ -9643,7 +9643,7 @@ public final Single<T> lastOrError() {
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <R> Observable<R> lift(ObservableOperator<? extends R, ? super T> lifter) {
-        ObjectHelper.requireNonNull(lifter, "lifter is null");
+        Objects.requireNonNull(lifter, "lifter is null");
         return RxJavaPlugins.onAssembly(new ObservableLift<R, T>(this, lifter));
     }
 
@@ -9667,7 +9667,7 @@ public final <R> Observable<R> lift(ObservableOperator<? extends R, ? super T> l
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <R> Observable<R> map(Function<? super T, ? extends R> mapper) {
-        ObjectHelper.requireNonNull(mapper, "mapper is null");
+        Objects.requireNonNull(mapper, "mapper is null");
         return RxJavaPlugins.onAssembly(new ObservableMap<T, R>(this, mapper));
     }
 
@@ -9712,7 +9712,7 @@ public final Observable<Notification<T>> materialize() {
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Observable<T> mergeWith(ObservableSource<? extends T> other) {
-        ObjectHelper.requireNonNull(other, "other is null");
+        Objects.requireNonNull(other, "other is null");
         return merge(this, other);
     }
 
@@ -9735,7 +9735,7 @@ public final Observable<T> mergeWith(ObservableSource<? extends T> other) {
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Observable<T> mergeWith(@NonNull SingleSource<? extends T> other) {
-        ObjectHelper.requireNonNull(other, "other is null");
+        Objects.requireNonNull(other, "other is null");
         return RxJavaPlugins.onAssembly(new ObservableMergeWithSingle<T>(this, other));
     }
 
@@ -9759,7 +9759,7 @@ public final Observable<T> mergeWith(@NonNull SingleSource<? extends T> other) {
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Observable<T> mergeWith(@NonNull MaybeSource<? extends T> other) {
-        ObjectHelper.requireNonNull(other, "other is null");
+        Objects.requireNonNull(other, "other is null");
         return RxJavaPlugins.onAssembly(new ObservableMergeWithMaybe<T>(this, other));
     }
 
@@ -9780,7 +9780,7 @@ public final Observable<T> mergeWith(@NonNull MaybeSource<? extends T> other) {
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Observable<T> mergeWith(@NonNull CompletableSource other) {
-        ObjectHelper.requireNonNull(other, "other is null");
+        Objects.requireNonNull(other, "other is null");
         return RxJavaPlugins.onAssembly(new ObservableMergeWithCompletable<T>(this, other));
     }
 
@@ -9895,7 +9895,7 @@ public final Observable<T> observeOn(Scheduler scheduler, boolean delayError) {
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.CUSTOM)
     public final Observable<T> observeOn(Scheduler scheduler, boolean delayError, int bufferSize) {
-        ObjectHelper.requireNonNull(scheduler, "scheduler is null");
+        Objects.requireNonNull(scheduler, "scheduler is null");
         ObjectHelper.verifyPositive(bufferSize, "bufferSize");
         return RxJavaPlugins.onAssembly(new ObservableObserveOn<T>(this, scheduler, delayError, bufferSize));
     }
@@ -9918,7 +9918,7 @@ public final Observable<T> observeOn(Scheduler scheduler, boolean delayError, in
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <U> Observable<U> ofType(final Class<U> clazz) {
-        ObjectHelper.requireNonNull(clazz, "clazz is null");
+        Objects.requireNonNull(clazz, "clazz is null");
         return filter(Functions.isInstanceOf(clazz)).cast(clazz);
     }
 
@@ -9954,7 +9954,7 @@ public final <U> Observable<U> ofType(final Class<U> clazz) {
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Observable<T> onErrorResumeNext(Function<? super Throwable, ? extends ObservableSource<? extends T>> resumeFunction) {
-        ObjectHelper.requireNonNull(resumeFunction, "resumeFunction is null");
+        Objects.requireNonNull(resumeFunction, "resumeFunction is null");
         return RxJavaPlugins.onAssembly(new ObservableOnErrorNext<T>(this, resumeFunction));
     }
 
@@ -9990,7 +9990,7 @@ public final Observable<T> onErrorResumeNext(Function<? super Throwable, ? exten
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Observable<T> onErrorResumeWith(final ObservableSource<? extends T> next) {
-        ObjectHelper.requireNonNull(next, "next is null");
+        Objects.requireNonNull(next, "next is null");
         return onErrorResumeNext(Functions.justFunction(next));
     }
 
@@ -10023,7 +10023,7 @@ public final Observable<T> onErrorResumeWith(final ObservableSource<? extends T>
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Observable<T> onErrorReturn(Function<? super Throwable, ? extends T> valueSupplier) {
-        ObjectHelper.requireNonNull(valueSupplier, "valueSupplier is null");
+        Objects.requireNonNull(valueSupplier, "valueSupplier is null");
         return RxJavaPlugins.onAssembly(new ObservableOnErrorReturn<T>(this, valueSupplier));
     }
 
@@ -10056,7 +10056,7 @@ public final Observable<T> onErrorReturn(Function<? super Throwable, ? extends T
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Observable<T> onErrorReturnItem(final T item) {
-        ObjectHelper.requireNonNull(item, "item is null");
+        Objects.requireNonNull(item, "item is null");
         return onErrorReturn(Functions.justFunction(item));
     }
 
@@ -10122,7 +10122,7 @@ public final ConnectableObservable<T> publish() {
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <R> Observable<R> publish(Function<? super Observable<T>, ? extends ObservableSource<R>> selector) {
-        ObjectHelper.requireNonNull(selector, "selector is null");
+        Objects.requireNonNull(selector, "selector is null");
         return RxJavaPlugins.onAssembly(new ObservablePublishSelector<T, R>(this, selector));
     }
 
@@ -10157,7 +10157,7 @@ public final <R> Observable<R> publish(Function<? super Observable<T>, ? extends
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Maybe<T> reduce(BiFunction<T, T, T> reducer) {
-        ObjectHelper.requireNonNull(reducer, "reducer is null");
+        Objects.requireNonNull(reducer, "reducer is null");
         return RxJavaPlugins.onAssembly(new ObservableReduceMaybe<T>(this, reducer));
     }
 
@@ -10214,8 +10214,8 @@ public final Maybe<T> reduce(BiFunction<T, T, T> reducer) {
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <R> Single<R> reduce(R seed, BiFunction<R, ? super T, R> reducer) {
-        ObjectHelper.requireNonNull(seed, "seed is null");
-        ObjectHelper.requireNonNull(reducer, "reducer is null");
+        Objects.requireNonNull(seed, "seed is null");
+        Objects.requireNonNull(reducer, "reducer is null");
         return RxJavaPlugins.onAssembly(new ObservableReduceSeedSingle<T, R>(this, seed, reducer));
     }
 
@@ -10254,8 +10254,8 @@ public final <R> Single<R> reduce(R seed, BiFunction<R, ? super T, R> reducer) {
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <R> Single<R> reduceWith(Supplier<R> seedSupplier, BiFunction<R, ? super T, R> reducer) {
-        ObjectHelper.requireNonNull(seedSupplier, "seedSupplier is null");
-        ObjectHelper.requireNonNull(reducer, "reducer is null");
+        Objects.requireNonNull(seedSupplier, "seedSupplier is null");
+        Objects.requireNonNull(reducer, "reducer is null");
         return RxJavaPlugins.onAssembly(new ObservableReduceWithSingle<T, R>(this, seedSupplier, reducer));
     }
 
@@ -10330,7 +10330,7 @@ public final Observable<T> repeat(long times) {
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Observable<T> repeatUntil(BooleanSupplier stop) {
-        ObjectHelper.requireNonNull(stop, "stop is null");
+        Objects.requireNonNull(stop, "stop is null");
         return RxJavaPlugins.onAssembly(new ObservableRepeatUntil<T>(this, stop));
     }
 
@@ -10356,7 +10356,7 @@ public final Observable<T> repeatUntil(BooleanSupplier stop) {
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Observable<T> repeatWhen(final Function<? super Observable<Object>, ? extends ObservableSource<?>> handler) {
-        ObjectHelper.requireNonNull(handler, "handler is null");
+        Objects.requireNonNull(handler, "handler is null");
         return RxJavaPlugins.onAssembly(new ObservableRepeatWhen<T>(this, handler));
     }
 
@@ -10404,7 +10404,7 @@ public final ConnectableObservable<T> replay() {
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <R> Observable<R> replay(Function<? super Observable<T>, ? extends ObservableSource<R>> selector) {
-        ObjectHelper.requireNonNull(selector, "selector is null");
+        Objects.requireNonNull(selector, "selector is null");
         return ObservableReplay.multicastSelector(ObservableInternalHelper.replaySupplier(this), selector);
     }
 
@@ -10438,7 +10438,7 @@ public final <R> Observable<R> replay(Function<? super Observable<T>, ? extends
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <R> Observable<R> replay(Function<? super Observable<T>, ? extends ObservableSource<R>> selector, final int bufferSize) {
-        ObjectHelper.requireNonNull(selector, "selector is null");
+        Objects.requireNonNull(selector, "selector is null");
         ObjectHelper.verifyPositive(bufferSize, "bufferSize");
         return ObservableReplay.multicastSelector(ObservableInternalHelper.replaySupplier(this, bufferSize, false), selector);
     }
@@ -10475,7 +10475,7 @@ public final <R> Observable<R> replay(Function<? super Observable<T>, ? extends
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <R> Observable<R> replay(Function<? super Observable<T>, ? extends ObservableSource<R>> selector, final int bufferSize, boolean eagerTruncate) {
-        ObjectHelper.requireNonNull(selector, "selector is null");
+        Objects.requireNonNull(selector, "selector is null");
         ObjectHelper.verifyPositive(bufferSize, "bufferSize");
         return ObservableReplay.multicastSelector(ObservableInternalHelper.replaySupplier(this, bufferSize, eagerTruncate), selector);
     }
@@ -10556,10 +10556,10 @@ public final <R> Observable<R> replay(Function<? super Observable<T>, ? extends
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.CUSTOM)
     public final <R> Observable<R> replay(Function<? super Observable<T>, ? extends ObservableSource<R>> selector, final int bufferSize, final long time, final TimeUnit unit, final Scheduler scheduler) {
-        ObjectHelper.requireNonNull(selector, "selector is null");
+        Objects.requireNonNull(selector, "selector is null");
         ObjectHelper.verifyPositive(bufferSize, "bufferSize");
-        ObjectHelper.requireNonNull(unit, "unit is null");
-        ObjectHelper.requireNonNull(scheduler, "scheduler is null");
+        Objects.requireNonNull(unit, "unit is null");
+        Objects.requireNonNull(scheduler, "scheduler is null");
         return ObservableReplay.multicastSelector(
                 ObservableInternalHelper.replaySupplier(this, bufferSize, time, unit, scheduler, false), selector);
     }
@@ -10604,10 +10604,10 @@ public final <R> Observable<R> replay(Function<? super Observable<T>, ? extends
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.CUSTOM)
     public final <R> Observable<R> replay(Function<? super Observable<T>, ? extends ObservableSource<R>> selector, final int bufferSize, final long time, final TimeUnit unit, final Scheduler scheduler, boolean eagerTruncate) {
-        ObjectHelper.requireNonNull(selector, "selector is null");
+        Objects.requireNonNull(selector, "selector is null");
         ObjectHelper.verifyPositive(bufferSize, "bufferSize");
-        ObjectHelper.requireNonNull(unit, "unit is null");
-        ObjectHelper.requireNonNull(scheduler, "scheduler is null");
+        Objects.requireNonNull(unit, "unit is null");
+        Objects.requireNonNull(scheduler, "scheduler is null");
         return ObservableReplay.multicastSelector(
                 ObservableInternalHelper.replaySupplier(this, bufferSize, time, unit, scheduler, eagerTruncate), selector);
     }
@@ -10674,9 +10674,9 @@ public final <R> Observable<R> replay(Function<? super Observable<T>, ? extends
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.CUSTOM)
     public final <R> Observable<R> replay(Function<? super Observable<T>, ? extends ObservableSource<R>> selector, final long time, final TimeUnit unit, final Scheduler scheduler) {
-        ObjectHelper.requireNonNull(selector, "selector is null");
-        ObjectHelper.requireNonNull(unit, "unit is null");
-        ObjectHelper.requireNonNull(scheduler, "scheduler is null");
+        Objects.requireNonNull(selector, "selector is null");
+        Objects.requireNonNull(unit, "unit is null");
+        Objects.requireNonNull(scheduler, "scheduler is null");
         return ObservableReplay.multicastSelector(ObservableInternalHelper.replaySupplier(this, time, unit, scheduler, false), selector);
     }
 
@@ -10713,9 +10713,9 @@ public final <R> Observable<R> replay(Function<? super Observable<T>, ? extends
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.CUSTOM)
     public final <R> Observable<R> replay(Function<? super Observable<T>, ? extends ObservableSource<R>> selector, final long time, final TimeUnit unit, final Scheduler scheduler, boolean eagerTruncate) {
-        ObjectHelper.requireNonNull(selector, "selector is null");
-        ObjectHelper.requireNonNull(unit, "unit is null");
-        ObjectHelper.requireNonNull(scheduler, "scheduler is null");
+        Objects.requireNonNull(selector, "selector is null");
+        Objects.requireNonNull(unit, "unit is null");
+        Objects.requireNonNull(scheduler, "scheduler is null");
         return ObservableReplay.multicastSelector(ObservableInternalHelper.replaySupplier(this, time, unit, scheduler, eagerTruncate), selector);
     }
 
@@ -10854,8 +10854,8 @@ public final ConnectableObservable<T> replay(int bufferSize, long time, TimeUnit
     @SchedulerSupport(SchedulerSupport.CUSTOM)
     public final ConnectableObservable<T> replay(final int bufferSize, final long time, final TimeUnit unit, final Scheduler scheduler) {
         ObjectHelper.verifyPositive(bufferSize, "bufferSize");
-        ObjectHelper.requireNonNull(unit, "unit is null");
-        ObjectHelper.requireNonNull(scheduler, "scheduler is null");
+        Objects.requireNonNull(unit, "unit is null");
+        Objects.requireNonNull(scheduler, "scheduler is null");
         return ObservableReplay.create(this, time, unit, scheduler, bufferSize, false);
     }
 
@@ -10898,8 +10898,8 @@ public final ConnectableObservable<T> replay(final int bufferSize, final long ti
     @SchedulerSupport(SchedulerSupport.CUSTOM)
     public final ConnectableObservable<T> replay(final int bufferSize, final long time, final TimeUnit unit, final Scheduler scheduler, boolean eagerTruncate) {
         ObjectHelper.verifyPositive(bufferSize, "bufferSize");
-        ObjectHelper.requireNonNull(unit, "unit is null");
-        ObjectHelper.requireNonNull(scheduler, "scheduler is null");
+        Objects.requireNonNull(unit, "unit is null");
+        Objects.requireNonNull(scheduler, "scheduler is null");
         return ObservableReplay.create(this, time, unit, scheduler, bufferSize, eagerTruncate);
     }
 
@@ -10958,8 +10958,8 @@ public final ConnectableObservable<T> replay(long time, TimeUnit unit) {
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.CUSTOM)
     public final ConnectableObservable<T> replay(final long time, final TimeUnit unit, final Scheduler scheduler) {
-        ObjectHelper.requireNonNull(unit, "unit is null");
-        ObjectHelper.requireNonNull(scheduler, "scheduler is null");
+        Objects.requireNonNull(unit, "unit is null");
+        Objects.requireNonNull(scheduler, "scheduler is null");
         return ObservableReplay.create(this, time, unit, scheduler, false);
     }
 
@@ -10994,8 +10994,8 @@ public final ConnectableObservable<T> replay(final long time, final TimeUnit uni
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.CUSTOM)
     public final ConnectableObservable<T> replay(final long time, final TimeUnit unit, final Scheduler scheduler, boolean eagerTruncate) {
-        ObjectHelper.requireNonNull(unit, "unit is null");
-        ObjectHelper.requireNonNull(scheduler, "scheduler is null");
+        Objects.requireNonNull(unit, "unit is null");
+        Objects.requireNonNull(scheduler, "scheduler is null");
         return ObservableReplay.create(this, time, unit, scheduler, eagerTruncate);
     }
 
@@ -11046,7 +11046,7 @@ public final Observable<T> retry() {
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Observable<T> retry(BiPredicate<? super Integer, ? super Throwable> predicate) {
-        ObjectHelper.requireNonNull(predicate, "predicate is null");
+        Objects.requireNonNull(predicate, "predicate is null");
 
         return RxJavaPlugins.onAssembly(new ObservableRetryBiPredicate<T>(this, predicate));
     }
@@ -11099,7 +11099,7 @@ public final Observable<T> retry(long times, Predicate<? super Throwable> predic
         if (times < 0) {
             throw new IllegalArgumentException("times >= 0 required but it was " + times);
         }
-        ObjectHelper.requireNonNull(predicate, "predicate is null");
+        Objects.requireNonNull(predicate, "predicate is null");
 
         return RxJavaPlugins.onAssembly(new ObservableRetryPredicate<T>(this, times, predicate));
     }
@@ -11136,7 +11136,7 @@ public final Observable<T> retry(Predicate<? super Throwable> predicate) {
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Observable<T> retryUntil(final BooleanSupplier stop) {
-        ObjectHelper.requireNonNull(stop, "stop is null");
+        Objects.requireNonNull(stop, "stop is null");
         return retry(Long.MAX_VALUE, Functions.predicateReverseFor(stop));
     }
 
@@ -11217,7 +11217,7 @@ public final Observable<T> retryUntil(final BooleanSupplier stop) {
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Observable<T> retryWhen(
             final Function<? super Observable<Throwable>, ? extends ObservableSource<?>> handler) {
-        ObjectHelper.requireNonNull(handler, "handler is null");
+        Objects.requireNonNull(handler, "handler is null");
         return RxJavaPlugins.onAssembly(new ObservableRetryWhen<T>(this, handler));
     }
 
@@ -11235,7 +11235,7 @@ public final Observable<T> retryWhen(
      */
     @SchedulerSupport(SchedulerSupport.NONE)
     public final void safeSubscribe(Observer<? super T> observer) {
-        ObjectHelper.requireNonNull(observer, "observer is null");
+        Objects.requireNonNull(observer, "observer is null");
         if (observer instanceof SafeObserver) {
             subscribe(observer);
         } else {
@@ -11323,8 +11323,8 @@ public final Observable<T> sample(long period, TimeUnit unit, boolean emitLast)
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.CUSTOM)
     public final Observable<T> sample(long period, TimeUnit unit, Scheduler scheduler) {
-        ObjectHelper.requireNonNull(unit, "unit is null");
-        ObjectHelper.requireNonNull(scheduler, "scheduler is null");
+        Objects.requireNonNull(unit, "unit is null");
+        Objects.requireNonNull(scheduler, "scheduler is null");
         return RxJavaPlugins.onAssembly(new ObservableSampleTimed<T>(this, period, unit, scheduler, false));
     }
 
@@ -11359,8 +11359,8 @@ public final Observable<T> sample(long period, TimeUnit unit, Scheduler schedule
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.CUSTOM)
     public final Observable<T> sample(long period, TimeUnit unit, Scheduler scheduler, boolean emitLast) {
-        ObjectHelper.requireNonNull(unit, "unit is null");
-        ObjectHelper.requireNonNull(scheduler, "scheduler is null");
+        Objects.requireNonNull(unit, "unit is null");
+        Objects.requireNonNull(scheduler, "scheduler is null");
         return RxJavaPlugins.onAssembly(new ObservableSampleTimed<T>(this, period, unit, scheduler, emitLast));
     }
 
@@ -11385,7 +11385,7 @@ public final Observable<T> sample(long period, TimeUnit unit, Scheduler schedule
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <U> Observable<T> sample(ObservableSource<U> sampler) {
-        ObjectHelper.requireNonNull(sampler, "sampler is null");
+        Objects.requireNonNull(sampler, "sampler is null");
         return RxJavaPlugins.onAssembly(new ObservableSampleWithObservable<T>(this, sampler, false));
     }
 
@@ -11417,7 +11417,7 @@ public final <U> Observable<T> sample(ObservableSource<U> sampler) {
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <U> Observable<T> sample(ObservableSource<U> sampler, boolean emitLast) {
-        ObjectHelper.requireNonNull(sampler, "sampler is null");
+        Objects.requireNonNull(sampler, "sampler is null");
         return RxJavaPlugins.onAssembly(new ObservableSampleWithObservable<T>(this, sampler, emitLast));
     }
 
@@ -11445,7 +11445,7 @@ public final <U> Observable<T> sample(ObservableSource<U> sampler, boolean emitL
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Observable<T> scan(BiFunction<T, T, T> accumulator) {
-        ObjectHelper.requireNonNull(accumulator, "accumulator is null");
+        Objects.requireNonNull(accumulator, "accumulator is null");
         return RxJavaPlugins.onAssembly(new ObservableScan<T>(this, accumulator));
     }
 
@@ -11494,7 +11494,7 @@ public final Observable<T> scan(BiFunction<T, T, T> accumulator) {
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <R> Observable<R> scan(final R initialValue, BiFunction<R, ? super T, R> accumulator) {
-        ObjectHelper.requireNonNull(initialValue, "initialValue is null");
+        Objects.requireNonNull(initialValue, "initialValue is null");
         return scanWith(Functions.justSupplier(initialValue), accumulator);
     }
 
@@ -11529,8 +11529,8 @@ public final <R> Observable<R> scan(final R initialValue, BiFunction<R, ? super
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <R> Observable<R> scanWith(Supplier<R> seedSupplier, BiFunction<R, ? super T, R> accumulator) {
-        ObjectHelper.requireNonNull(seedSupplier, "seedSupplier is null");
-        ObjectHelper.requireNonNull(accumulator, "accumulator is null");
+        Objects.requireNonNull(seedSupplier, "seedSupplier is null");
+        Objects.requireNonNull(accumulator, "accumulator is null");
         return RxJavaPlugins.onAssembly(new ObservableScanSeed<T, R>(this, seedSupplier, accumulator));
     }
 
@@ -11621,7 +11621,7 @@ public final Maybe<T> singleElement() {
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Single<T> single(T defaultItem) {
-        ObjectHelper.requireNonNull(defaultItem, "defaultItem is null");
+        Objects.requireNonNull(defaultItem, "defaultItem is null");
         return RxJavaPlugins.onAssembly(new ObservableSingleSingle<T>(this, defaultItem));
     }
 
@@ -11902,8 +11902,8 @@ public final Observable<T> skipLast(long time, TimeUnit unit, Scheduler schedule
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.CUSTOM)
     public final Observable<T> skipLast(long time, TimeUnit unit, Scheduler scheduler, boolean delayError, int bufferSize) {
-        ObjectHelper.requireNonNull(unit, "unit is null");
-        ObjectHelper.requireNonNull(scheduler, "scheduler is null");
+        Objects.requireNonNull(unit, "unit is null");
+        Objects.requireNonNull(scheduler, "scheduler is null");
         ObjectHelper.verifyPositive(bufferSize, "bufferSize");
         // the internal buffer holds pairs of (timestamp, value) so double the default buffer size
         int s = bufferSize << 1;
@@ -11931,7 +11931,7 @@ public final Observable<T> skipLast(long time, TimeUnit unit, Scheduler schedule
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <U> Observable<T> skipUntil(ObservableSource<U> other) {
-        ObjectHelper.requireNonNull(other, "other is null");
+        Objects.requireNonNull(other, "other is null");
         return RxJavaPlugins.onAssembly(new ObservableSkipUntil<T, U>(this, other));
     }
 
@@ -11954,7 +11954,7 @@ public final <U> Observable<T> skipUntil(ObservableSource<U> other) {
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Observable<T> skipWhile(Predicate<? super T> predicate) {
-        ObjectHelper.requireNonNull(predicate, "predicate is null");
+        Objects.requireNonNull(predicate, "predicate is null");
         return RxJavaPlugins.onAssembly(new ObservableSkipWhile<T>(this, predicate));
     }
 
@@ -12004,7 +12004,7 @@ public final Observable<T> sorted() {
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Observable<T> sorted(Comparator<? super T> sortFunction) {
-        ObjectHelper.requireNonNull(sortFunction, "sortFunction is null");
+        Objects.requireNonNull(sortFunction, "sortFunction is null");
         return toList().toObservable().map(Functions.listSorter(sortFunction)).flatMapIterable(Functions.<List<T>>identity());
     }
 
@@ -12054,7 +12054,7 @@ public final Observable<T> startWithIterable(Iterable<? extends T> items) {
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Observable<T> startWith(ObservableSource<? extends T> other) {
-        ObjectHelper.requireNonNull(other, "other is null");
+        Objects.requireNonNull(other, "other is null");
         return concatArray(other, this);
     }
 
@@ -12081,7 +12081,7 @@ public final Observable<T> startWith(ObservableSource<? extends T> other) {
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Observable<T> startWithItem(T item) {
-        ObjectHelper.requireNonNull(item, "item is null");
+        Objects.requireNonNull(item, "item is null");
         return concatArray(just(item), this);
     }
 
@@ -12213,9 +12213,9 @@ public final Disposable subscribe(Consumer<? super T> onNext, Consumer<? super T
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Disposable subscribe(Consumer<? super T> onNext, Consumer<? super Throwable> onError,
             Action onComplete) {
-        ObjectHelper.requireNonNull(onNext, "onNext is null");
-        ObjectHelper.requireNonNull(onError, "onError is null");
-        ObjectHelper.requireNonNull(onComplete, "onComplete is null");
+        Objects.requireNonNull(onNext, "onNext is null");
+        Objects.requireNonNull(onError, "onError is null");
+        Objects.requireNonNull(onComplete, "onComplete is null");
 
         LambdaObserver<T> ls = new LambdaObserver<T>(onNext, onError, onComplete, Functions.emptyConsumer());
 
@@ -12227,11 +12227,11 @@ public final Disposable subscribe(Consumer<? super T> onNext, Consumer<? super T
     @SchedulerSupport(SchedulerSupport.NONE)
     @Override
     public final void subscribe(Observer<? super T> observer) {
-        ObjectHelper.requireNonNull(observer, "observer is null");
+        Objects.requireNonNull(observer, "observer is null");
         try {
             observer = RxJavaPlugins.onSubscribe(this, observer);
 
-            ObjectHelper.requireNonNull(observer, "The RxJavaPlugins.onSubscribe hook returned a null Observer. Please change the handler provided to RxJavaPlugins.setOnObservableSubscribe for invalid null returns. Further reading: https://github.com/ReactiveX/RxJava/wiki/Plugins");
+            Objects.requireNonNull(observer, "The RxJavaPlugins.onSubscribe hook returned a null Observer. Please change the handler provided to RxJavaPlugins.setOnObservableSubscribe for invalid null returns. Further reading: https://github.com/ReactiveX/RxJava/wiki/Plugins");
 
             subscribeActual(observer);
         } catch (NullPointerException e) { // NOPMD
@@ -12309,7 +12309,7 @@ public final <E extends Observer<? super T>> E subscribeWith(E observer) {
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.CUSTOM)
     public final Observable<T> subscribeOn(Scheduler scheduler) {
-        ObjectHelper.requireNonNull(scheduler, "scheduler is null");
+        Objects.requireNonNull(scheduler, "scheduler is null");
         return RxJavaPlugins.onAssembly(new ObservableSubscribeOn<T>(this, scheduler));
     }
 
@@ -12332,7 +12332,7 @@ public final Observable<T> subscribeOn(Scheduler scheduler) {
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Observable<T> switchIfEmpty(ObservableSource<? extends T> other) {
-        ObjectHelper.requireNonNull(other, "other is null");
+        Objects.requireNonNull(other, "other is null");
         return RxJavaPlugins.onAssembly(new ObservableSwitchIfEmpty<T>(this, other));
     }
 
@@ -12391,7 +12391,7 @@ public final <R> Observable<R> switchMap(Function<? super T, ? extends Observabl
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <R> Observable<R> switchMap(Function<? super T, ? extends ObservableSource<? extends R>> mapper, int bufferSize) {
-        ObjectHelper.requireNonNull(mapper, "mapper is null");
+        Objects.requireNonNull(mapper, "mapper is null");
         ObjectHelper.verifyPositive(bufferSize, "bufferSize");
         if (this instanceof ScalarSupplier) {
             @SuppressWarnings("unchecked")
@@ -12441,7 +12441,7 @@ public final <R> Observable<R> switchMap(Function<? super T, ? extends Observabl
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Completable switchMapCompletable(@NonNull Function<? super T, ? extends CompletableSource> mapper) {
-        ObjectHelper.requireNonNull(mapper, "mapper is null");
+        Objects.requireNonNull(mapper, "mapper is null");
         return RxJavaPlugins.onAssembly(new ObservableSwitchMapCompletable<T>(this, mapper, false));
     }
 
@@ -12483,7 +12483,7 @@ public final Completable switchMapCompletable(@NonNull Function<? super T, ? ext
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Completable switchMapCompletableDelayError(@NonNull Function<? super T, ? extends CompletableSource> mapper) {
-        ObjectHelper.requireNonNull(mapper, "mapper is null");
+        Objects.requireNonNull(mapper, "mapper is null");
         return RxJavaPlugins.onAssembly(new ObservableSwitchMapCompletable<T>(this, mapper, true));
     }
 
@@ -12519,7 +12519,7 @@ public final Completable switchMapCompletableDelayError(@NonNull Function<? supe
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <R> Observable<R> switchMapMaybe(@NonNull Function<? super T, ? extends MaybeSource<? extends R>> mapper) {
-        ObjectHelper.requireNonNull(mapper, "mapper is null");
+        Objects.requireNonNull(mapper, "mapper is null");
         return RxJavaPlugins.onAssembly(new ObservableSwitchMapMaybe<T, R>(this, mapper, false));
     }
 
@@ -12545,7 +12545,7 @@ public final <R> Observable<R> switchMapMaybe(@NonNull Function<? super T, ? ext
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <R> Observable<R> switchMapMaybeDelayError(@NonNull Function<? super T, ? extends MaybeSource<? extends R>> mapper) {
-        ObjectHelper.requireNonNull(mapper, "mapper is null");
+        Objects.requireNonNull(mapper, "mapper is null");
         return RxJavaPlugins.onAssembly(new ObservableSwitchMapMaybe<T, R>(this, mapper, true));
     }
 
@@ -12576,7 +12576,7 @@ public final <R> Observable<R> switchMapMaybeDelayError(@NonNull Function<? supe
     @SchedulerSupport(SchedulerSupport.NONE)
     @NonNull
     public final <R> Observable<R> switchMapSingle(@NonNull Function<? super T, ? extends SingleSource<? extends R>> mapper) {
-        ObjectHelper.requireNonNull(mapper, "mapper is null");
+        Objects.requireNonNull(mapper, "mapper is null");
         return RxJavaPlugins.onAssembly(new ObservableSwitchMapSingle<T, R>(this, mapper, false));
     }
 
@@ -12608,7 +12608,7 @@ public final <R> Observable<R> switchMapSingle(@NonNull Function<? super T, ? ex
     @SchedulerSupport(SchedulerSupport.NONE)
     @NonNull
     public final <R> Observable<R> switchMapSingleDelayError(@NonNull Function<? super T, ? extends SingleSource<? extends R>> mapper) {
-        ObjectHelper.requireNonNull(mapper, "mapper is null");
+        Objects.requireNonNull(mapper, "mapper is null");
         return RxJavaPlugins.onAssembly(new ObservableSwitchMapSingle<T, R>(this, mapper, true));
     }
 
@@ -12671,7 +12671,7 @@ public final <R> Observable<R> switchMapDelayError(Function<? super T, ? extends
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <R> Observable<R> switchMapDelayError(Function<? super T, ? extends ObservableSource<? extends R>> mapper, int bufferSize) {
-        ObjectHelper.requireNonNull(mapper, "mapper is null");
+        Objects.requireNonNull(mapper, "mapper is null");
         ObjectHelper.verifyPositive(bufferSize, "bufferSize");
         if (this instanceof ScalarSupplier) {
             @SuppressWarnings("unchecked")
@@ -12894,8 +12894,8 @@ public final Observable<T> takeLast(long count, long time, TimeUnit unit, Schedu
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.CUSTOM)
     public final Observable<T> takeLast(long count, long time, TimeUnit unit, Scheduler scheduler, boolean delayError, int bufferSize) {
-        ObjectHelper.requireNonNull(unit, "unit is null");
-        ObjectHelper.requireNonNull(scheduler, "scheduler is null");
+        Objects.requireNonNull(unit, "unit is null");
+        Objects.requireNonNull(scheduler, "scheduler is null");
         ObjectHelper.verifyPositive(bufferSize, "bufferSize");
         if (count < 0) {
             throw new IndexOutOfBoundsException("count >= 0 required but it was " + count);
@@ -13067,7 +13067,7 @@ public final Observable<T> takeLast(long time, TimeUnit unit, Scheduler schedule
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <U> Observable<T> takeUntil(ObservableSource<U> other) {
-        ObjectHelper.requireNonNull(other, "other is null");
+        Objects.requireNonNull(other, "other is null");
         return RxJavaPlugins.onAssembly(new ObservableTakeUntil<T, U>(this, other));
     }
 
@@ -13096,7 +13096,7 @@ public final <U> Observable<T> takeUntil(ObservableSource<U> other) {
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Observable<T> takeUntil(Predicate<? super T> stopPredicate) {
-        ObjectHelper.requireNonNull(stopPredicate, "stopPredicate is null");
+        Objects.requireNonNull(stopPredicate, "stopPredicate is null");
         return RxJavaPlugins.onAssembly(new ObservableTakeUntilPredicate<T>(this, stopPredicate));
     }
 
@@ -13120,7 +13120,7 @@ public final Observable<T> takeUntil(Predicate<? super T> stopPredicate) {
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Observable<T> takeWhile(Predicate<? super T> predicate) {
-        ObjectHelper.requireNonNull(predicate, "predicate is null");
+        Objects.requireNonNull(predicate, "predicate is null");
         return RxJavaPlugins.onAssembly(new ObservableTakeWhile<T>(this, predicate));
     }
 
@@ -13176,8 +13176,8 @@ public final Observable<T> throttleFirst(long windowDuration, TimeUnit unit) {
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.CUSTOM)
     public final Observable<T> throttleFirst(long skipDuration, TimeUnit unit, Scheduler scheduler) {
-        ObjectHelper.requireNonNull(unit, "unit is null");
-        ObjectHelper.requireNonNull(scheduler, "scheduler is null");
+        Objects.requireNonNull(unit, "unit is null");
+        Objects.requireNonNull(scheduler, "scheduler is null");
         return RxJavaPlugins.onAssembly(new ObservableThrottleFirstTimed<T>(this, skipDuration, unit, scheduler));
     }
 
@@ -13363,8 +13363,8 @@ public final Observable<T> throttleLatest(long timeout, TimeUnit unit, Scheduler
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.CUSTOM)
     public final Observable<T> throttleLatest(long timeout, TimeUnit unit, Scheduler scheduler, boolean emitLast) {
-        ObjectHelper.requireNonNull(unit, "unit is null");
-        ObjectHelper.requireNonNull(scheduler, "scheduler is null");
+        Objects.requireNonNull(unit, "unit is null");
+        Objects.requireNonNull(scheduler, "scheduler is null");
         return RxJavaPlugins.onAssembly(new ObservableThrottleLatest<T>(this, timeout, unit, scheduler, emitLast));
     }
 
@@ -13516,8 +13516,8 @@ public final Observable<Timed<T>> timeInterval(TimeUnit unit) {
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.NONE) // Supplied scheduler is only used for creating timestamps.
     public final Observable<Timed<T>> timeInterval(TimeUnit unit, Scheduler scheduler) {
-        ObjectHelper.requireNonNull(unit, "unit is null");
-        ObjectHelper.requireNonNull(scheduler, "scheduler is null");
+        Objects.requireNonNull(unit, "unit is null");
+        Objects.requireNonNull(scheduler, "scheduler is null");
         return RxJavaPlugins.onAssembly(new ObservableTimeInterval<T>(this, unit, scheduler));
     }
 
@@ -13581,7 +13581,7 @@ public final <V> Observable<T> timeout(Function<? super T, ? extends ObservableS
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <V> Observable<T> timeout(Function<? super T, ? extends ObservableSource<V>> itemTimeoutIndicator,
             ObservableSource<? extends T> other) {
-        ObjectHelper.requireNonNull(other, "other is null");
+        Objects.requireNonNull(other, "other is null");
         return timeout0(null, itemTimeoutIndicator, other);
     }
 
@@ -13634,7 +13634,7 @@ public final Observable<T> timeout(long timeout, TimeUnit timeUnit) {
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.COMPUTATION)
     public final Observable<T> timeout(long timeout, TimeUnit timeUnit, ObservableSource<? extends T> other) {
-        ObjectHelper.requireNonNull(other, "other is null");
+        Objects.requireNonNull(other, "other is null");
         return timeout0(timeout, timeUnit, other, Schedulers.computation());
     }
 
@@ -13665,7 +13665,7 @@ public final Observable<T> timeout(long timeout, TimeUnit timeUnit, ObservableSo
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.CUSTOM)
     public final Observable<T> timeout(long timeout, TimeUnit timeUnit, Scheduler scheduler, ObservableSource<? extends T> other) {
-        ObjectHelper.requireNonNull(other, "other is null");
+        Objects.requireNonNull(other, "other is null");
         return timeout0(timeout, timeUnit, other, scheduler);
     }
 
@@ -13728,7 +13728,7 @@ public final Observable<T> timeout(long timeout, TimeUnit timeUnit, Scheduler sc
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <U, V> Observable<T> timeout(ObservableSource<U> firstTimeoutIndicator,
             Function<? super T, ? extends ObservableSource<V>> itemTimeoutIndicator) {
-        ObjectHelper.requireNonNull(firstTimeoutIndicator, "firstTimeoutIndicator is null");
+        Objects.requireNonNull(firstTimeoutIndicator, "firstTimeoutIndicator is null");
         return timeout0(firstTimeoutIndicator, itemTimeoutIndicator, null);
     }
 
@@ -13770,15 +13770,15 @@ public final <U, V> Observable<T> timeout(
             ObservableSource<U> firstTimeoutIndicator,
             Function<? super T, ? extends ObservableSource<V>> itemTimeoutIndicator,
                     ObservableSource<? extends T> other) {
-        ObjectHelper.requireNonNull(firstTimeoutIndicator, "firstTimeoutIndicator is null");
-        ObjectHelper.requireNonNull(other, "other is null");
+        Objects.requireNonNull(firstTimeoutIndicator, "firstTimeoutIndicator is null");
+        Objects.requireNonNull(other, "other is null");
         return timeout0(firstTimeoutIndicator, itemTimeoutIndicator, other);
     }
 
     private Observable<T> timeout0(long timeout, TimeUnit timeUnit, ObservableSource<? extends T> other,
             Scheduler scheduler) {
-        ObjectHelper.requireNonNull(timeUnit, "timeUnit is null");
-        ObjectHelper.requireNonNull(scheduler, "scheduler is null");
+        Objects.requireNonNull(timeUnit, "timeUnit is null");
+        Objects.requireNonNull(scheduler, "scheduler is null");
         return RxJavaPlugins.onAssembly(new ObservableTimeoutTimed<T>(this, timeout, timeUnit, scheduler, other));
     }
 
@@ -13786,7 +13786,7 @@ private <U, V> Observable<T> timeout0(
             ObservableSource<U> firstTimeoutIndicator,
             Function<? super T, ? extends ObservableSource<V>> itemTimeoutIndicator,
                     ObservableSource<? extends T> other) {
-        ObjectHelper.requireNonNull(itemTimeoutIndicator, "itemTimeoutIndicator is null");
+        Objects.requireNonNull(itemTimeoutIndicator, "itemTimeoutIndicator is null");
         return RxJavaPlugins.onAssembly(new ObservableTimeout<T, U, V>(this, firstTimeoutIndicator, itemTimeoutIndicator, other));
     }
 
@@ -13875,8 +13875,8 @@ public final Observable<Timed<T>> timestamp(TimeUnit unit) {
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.NONE) // Supplied scheduler is only used for creating timestamps.
     public final Observable<Timed<T>> timestamp(final TimeUnit unit, final Scheduler scheduler) {
-        ObjectHelper.requireNonNull(unit, "unit is null");
-        ObjectHelper.requireNonNull(scheduler, "scheduler is null");
+        Objects.requireNonNull(unit, "unit is null");
+        Objects.requireNonNull(scheduler, "scheduler is null");
         return map(Functions.<T>timestampWith(unit, scheduler));
     }
 
@@ -13898,7 +13898,7 @@ public final Observable<Timed<T>> timestamp(final TimeUnit unit, final Scheduler
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <R> R to(@NonNull ObservableConverter<T, ? extends R> converter) {
-        return ObjectHelper.requireNonNull(converter, "converter is null").apply(this);
+        return Objects.requireNonNull(converter, "converter is null").apply(this);
     }
 
     /**
@@ -13994,7 +13994,7 @@ public final Single<List<T>> toList(final int capacityHint) {
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <U extends Collection<? super T>> Single<U> toList(Supplier<U> collectionSupplier) {
-        ObjectHelper.requireNonNull(collectionSupplier, "collectionSupplier is null");
+        Objects.requireNonNull(collectionSupplier, "collectionSupplier is null");
         return RxJavaPlugins.onAssembly(new ObservableToListSingle<T, U>(this, collectionSupplier));
     }
 
@@ -14025,7 +14025,7 @@ public final <U extends Collection<? super T>> Single<U> toList(Supplier<U> coll
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <K> Single<Map<K, T>> toMap(final Function<? super T, ? extends K> keySelector) {
-        ObjectHelper.requireNonNull(keySelector, "keySelector is null");
+        Objects.requireNonNull(keySelector, "keySelector is null");
         return collect(HashMapSupplier.<K, T>asSupplier(), Functions.toMapKeySelector(keySelector));
     }
 
@@ -14061,8 +14061,8 @@ public final <K> Single<Map<K, T>> toMap(final Function<? super T, ? extends K>
     public final <K, V> Single<Map<K, V>> toMap(
             final Function<? super T, ? extends K> keySelector,
             final Function<? super T, ? extends V> valueSelector) {
-        ObjectHelper.requireNonNull(keySelector, "keySelector is null");
-        ObjectHelper.requireNonNull(valueSelector, "valueSelector is null");
+        Objects.requireNonNull(keySelector, "keySelector is null");
+        Objects.requireNonNull(valueSelector, "valueSelector is null");
         return collect(HashMapSupplier.<K, V>asSupplier(), Functions.toMapKeyValueSelector(keySelector, valueSelector));
     }
 
@@ -14098,9 +14098,9 @@ public final <K, V> Single<Map<K, V>> toMap(
             final Function<? super T, ? extends K> keySelector,
             final Function<? super T, ? extends V> valueSelector,
             Supplier<? extends Map<K, V>> mapSupplier) {
-        ObjectHelper.requireNonNull(keySelector, "keySelector is null");
-        ObjectHelper.requireNonNull(valueSelector, "valueSelector is null");
-        ObjectHelper.requireNonNull(mapSupplier, "mapSupplier is null");
+        Objects.requireNonNull(keySelector, "keySelector is null");
+        Objects.requireNonNull(valueSelector, "valueSelector is null");
+        Objects.requireNonNull(mapSupplier, "mapSupplier is null");
         return collect(mapSupplier, Functions.toMapKeyValueSelector(keySelector, valueSelector));
     }
 
@@ -14200,10 +14200,10 @@ public final <K, V> Single<Map<K, Collection<V>>> toMultimap(
             final Function<? super T, ? extends V> valueSelector,
             final Supplier<? extends Map<K, Collection<V>>> mapSupplier,
             final Function<? super K, ? extends Collection<? super V>> collectionFactory) {
-        ObjectHelper.requireNonNull(keySelector, "keySelector is null");
-        ObjectHelper.requireNonNull(valueSelector, "valueSelector is null");
-        ObjectHelper.requireNonNull(mapSupplier, "mapSupplier is null");
-        ObjectHelper.requireNonNull(collectionFactory, "collectionFactory is null");
+        Objects.requireNonNull(keySelector, "keySelector is null");
+        Objects.requireNonNull(valueSelector, "valueSelector is null");
+        Objects.requireNonNull(mapSupplier, "mapSupplier is null");
+        Objects.requireNonNull(collectionFactory, "collectionFactory is null");
         return collect(mapSupplier, Functions.toMultimapKeyValueSelector(keySelector, valueSelector, collectionFactory));
     }
 
@@ -14352,7 +14352,7 @@ public final Single<List<T>> toSortedList() {
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Single<List<T>> toSortedList(final Comparator<? super T> comparator) {
-        ObjectHelper.requireNonNull(comparator, "comparator is null");
+        Objects.requireNonNull(comparator, "comparator is null");
         return toList().map(Functions.listSorter(comparator));
     }
 
@@ -14383,7 +14383,7 @@ public final Single<List<T>> toSortedList(final Comparator<? super T> comparator
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Single<List<T>> toSortedList(final Comparator<? super T> comparator, int capacityHint) {
-        ObjectHelper.requireNonNull(comparator, "comparator is null");
+        Objects.requireNonNull(comparator, "comparator is null");
         return toList(capacityHint).map(Functions.listSorter(comparator));
     }
 
@@ -14438,7 +14438,7 @@ public final Single<List<T>> toSortedList(int capacityHint) {
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.CUSTOM)
     public final Observable<T> unsubscribeOn(Scheduler scheduler) {
-        ObjectHelper.requireNonNull(scheduler, "scheduler is null");
+        Objects.requireNonNull(scheduler, "scheduler is null");
         return RxJavaPlugins.onAssembly(new ObservableUnsubscribeOn<T>(this, scheduler));
     }
 
@@ -14633,8 +14633,8 @@ public final Observable<Observable<T>> window(long timespan, long timeskip, Time
         ObjectHelper.verifyPositive(timespan, "timespan");
         ObjectHelper.verifyPositive(timeskip, "timeskip");
         ObjectHelper.verifyPositive(bufferSize, "bufferSize");
-        ObjectHelper.requireNonNull(scheduler, "scheduler is null");
-        ObjectHelper.requireNonNull(unit, "unit is null");
+        Objects.requireNonNull(scheduler, "scheduler is null");
+        Objects.requireNonNull(unit, "unit is null");
         return RxJavaPlugins.onAssembly(new ObservableWindowTimed<T>(this, timespan, timeskip, unit, scheduler, Long.MAX_VALUE, bufferSize, false));
     }
 
@@ -14903,8 +14903,8 @@ public final Observable<Observable<T>> window(
             long timespan, TimeUnit unit, Scheduler scheduler,
             long count, boolean restart, int bufferSize) {
         ObjectHelper.verifyPositive(bufferSize, "bufferSize");
-        ObjectHelper.requireNonNull(scheduler, "scheduler is null");
-        ObjectHelper.requireNonNull(unit, "unit is null");
+        Objects.requireNonNull(scheduler, "scheduler is null");
+        Objects.requireNonNull(unit, "unit is null");
         ObjectHelper.verifyPositive(count, "count");
         return RxJavaPlugins.onAssembly(new ObservableWindowTimed<T>(this, timespan, timespan, unit, scheduler, count, bufferSize, restart));
     }
@@ -14970,7 +14970,7 @@ public final <B> Observable<Observable<T>> window(ObservableSource<B> boundary)
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <B> Observable<Observable<T>> window(ObservableSource<B> boundary, int bufferSize) {
-        ObjectHelper.requireNonNull(boundary, "boundary is null");
+        Objects.requireNonNull(boundary, "boundary is null");
         ObjectHelper.verifyPositive(bufferSize, "bufferSize");
         return RxJavaPlugins.onAssembly(new ObservableWindowBoundary<T, B>(this, boundary, bufferSize));
     }
@@ -15046,8 +15046,8 @@ public final <U, V> Observable<Observable<T>> window(
     public final <U, V> Observable<Observable<T>> window(
             ObservableSource<U> openingIndicator,
             Function<? super U, ? extends ObservableSource<V>> closingIndicator, int bufferSize) {
-        ObjectHelper.requireNonNull(openingIndicator, "openingIndicator is null");
-        ObjectHelper.requireNonNull(closingIndicator, "closingIndicator is null");
+        Objects.requireNonNull(openingIndicator, "openingIndicator is null");
+        Objects.requireNonNull(closingIndicator, "closingIndicator is null");
         ObjectHelper.verifyPositive(bufferSize, "bufferSize");
         return RxJavaPlugins.onAssembly(new ObservableWindowBoundarySelector<T, U, V>(this, openingIndicator, closingIndicator, bufferSize));
     }
@@ -15079,8 +15079,8 @@ public final <U, V> Observable<Observable<T>> window(
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <U, R> Observable<R> withLatestFrom(ObservableSource<? extends U> other, BiFunction<? super T, ? super U, ? extends R> combiner) {
-        ObjectHelper.requireNonNull(other, "other is null");
-        ObjectHelper.requireNonNull(combiner, "combiner is null");
+        Objects.requireNonNull(other, "other is null");
+        Objects.requireNonNull(combiner, "combiner is null");
 
         return RxJavaPlugins.onAssembly(new ObservableWithLatestFrom<T, U, R>(this, combiner, other));
     }
@@ -15114,9 +15114,9 @@ public final <U, R> Observable<R> withLatestFrom(ObservableSource<? extends U> o
     public final <T1, T2, R> Observable<R> withLatestFrom(
             ObservableSource<T1> o1, ObservableSource<T2> o2,
             Function3<? super T, ? super T1, ? super T2, R> combiner) {
-        ObjectHelper.requireNonNull(o1, "o1 is null");
-        ObjectHelper.requireNonNull(o2, "o2 is null");
-        ObjectHelper.requireNonNull(combiner, "combiner is null");
+        Objects.requireNonNull(o1, "o1 is null");
+        Objects.requireNonNull(o2, "o2 is null");
+        Objects.requireNonNull(combiner, "combiner is null");
         Function<Object[], R> f = Functions.toFunction(combiner);
         return withLatestFrom(new ObservableSource[] { o1, o2 }, f);
     }
@@ -15153,10 +15153,10 @@ public final <T1, T2, T3, R> Observable<R> withLatestFrom(
             ObservableSource<T1> o1, ObservableSource<T2> o2,
             ObservableSource<T3> o3,
             Function4<? super T, ? super T1, ? super T2, ? super T3, R> combiner) {
-        ObjectHelper.requireNonNull(o1, "o1 is null");
-        ObjectHelper.requireNonNull(o2, "o2 is null");
-        ObjectHelper.requireNonNull(o3, "o3 is null");
-        ObjectHelper.requireNonNull(combiner, "combiner is null");
+        Objects.requireNonNull(o1, "o1 is null");
+        Objects.requireNonNull(o2, "o2 is null");
+        Objects.requireNonNull(o3, "o3 is null");
+        Objects.requireNonNull(combiner, "combiner is null");
         Function<Object[], R> f = Functions.toFunction(combiner);
         return withLatestFrom(new ObservableSource[] { o1, o2, o3 }, f);
     }
@@ -15195,11 +15195,11 @@ public final <T1, T2, T3, T4, R> Observable<R> withLatestFrom(
             ObservableSource<T1> o1, ObservableSource<T2> o2,
             ObservableSource<T3> o3, ObservableSource<T4> o4,
             Function5<? super T, ? super T1, ? super T2, ? super T3, ? super T4, R> combiner) {
-        ObjectHelper.requireNonNull(o1, "o1 is null");
-        ObjectHelper.requireNonNull(o2, "o2 is null");
-        ObjectHelper.requireNonNull(o3, "o3 is null");
-        ObjectHelper.requireNonNull(o4, "o4 is null");
-        ObjectHelper.requireNonNull(combiner, "combiner is null");
+        Objects.requireNonNull(o1, "o1 is null");
+        Objects.requireNonNull(o2, "o2 is null");
+        Objects.requireNonNull(o3, "o3 is null");
+        Objects.requireNonNull(o4, "o4 is null");
+        Objects.requireNonNull(combiner, "combiner is null");
         Function<Object[], R> f = Functions.toFunction(combiner);
         return withLatestFrom(new ObservableSource[] { o1, o2, o3, o4 }, f);
     }
@@ -15228,8 +15228,8 @@ public final <T1, T2, T3, T4, R> Observable<R> withLatestFrom(
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <R> Observable<R> withLatestFrom(ObservableSource<?>[] others, Function<? super Object[], R> combiner) {
-        ObjectHelper.requireNonNull(others, "others is null");
-        ObjectHelper.requireNonNull(combiner, "combiner is null");
+        Objects.requireNonNull(others, "others is null");
+        Objects.requireNonNull(combiner, "combiner is null");
         return RxJavaPlugins.onAssembly(new ObservableWithLatestFromMany<T, R>(this, others, combiner));
     }
 
@@ -15257,8 +15257,8 @@ public final <R> Observable<R> withLatestFrom(ObservableSource<?>[] others, Func
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <R> Observable<R> withLatestFrom(Iterable<? extends ObservableSource<?>> others, Function<? super Object[], R> combiner) {
-        ObjectHelper.requireNonNull(others, "others is null");
-        ObjectHelper.requireNonNull(combiner, "combiner is null");
+        Objects.requireNonNull(others, "others is null");
+        Objects.requireNonNull(combiner, "combiner is null");
         return RxJavaPlugins.onAssembly(new ObservableWithLatestFromMany<T, R>(this, others, combiner));
     }
 
@@ -15291,8 +15291,8 @@ public final <R> Observable<R> withLatestFrom(Iterable<? extends ObservableSourc
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <U, R> Observable<R> zipWith(Iterable<U> other,  BiFunction<? super T, ? super U, ? extends R> zipper) {
-        ObjectHelper.requireNonNull(other, "other is null");
-        ObjectHelper.requireNonNull(zipper, "zipper is null");
+        Objects.requireNonNull(other, "other is null");
+        Objects.requireNonNull(zipper, "zipper is null");
         return RxJavaPlugins.onAssembly(new ObservableZipIterable<T, U, R>(this, other, zipper));
     }
 
@@ -15335,7 +15335,7 @@ public final <U, R> Observable<R> zipWith(Iterable<U> other,  BiFunction<? super
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <U, R> Observable<R> zipWith(ObservableSource<? extends U> other,
             BiFunction<? super T, ? super U, ? extends R> zipper) {
-        ObjectHelper.requireNonNull(other, "other is null");
+        Objects.requireNonNull(other, "other is null");
         return zip(this, other, zipper);
     }
 
diff --git a/src/main/java/io/reactivex/rxjava3/core/Single.java b/src/main/java/io/reactivex/rxjava3/core/Single.java
index 3cffa8dfad..27fad6d53e 100644
--- a/src/main/java/io/reactivex/rxjava3/core/Single.java
+++ b/src/main/java/io/reactivex/rxjava3/core/Single.java
@@ -14,6 +14,7 @@
 package io.reactivex.rxjava3.core;
 
 import java.util.NoSuchElementException;
+import java.util.Objects;
 import java.util.concurrent.*;
 
 import org.reactivestreams.Publisher;
@@ -132,7 +133,7 @@ public abstract class Single<T> implements SingleSource<T> {
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public static <T> Single<T> amb(final Iterable<? extends SingleSource<? extends T>> sources) {
-        ObjectHelper.requireNonNull(sources, "sources is null");
+        Objects.requireNonNull(sources, "sources is null");
         return RxJavaPlugins.onAssembly(new SingleAmb<T>(null, sources));
     }
 
@@ -207,7 +208,7 @@ public static <T> Flowable<T> concat(Iterable<? extends SingleSource<? extends T
     @SchedulerSupport(SchedulerSupport.NONE)
     @SuppressWarnings({ "unchecked", "rawtypes" })
     public static <T> Observable<T> concat(ObservableSource<? extends SingleSource<? extends T>> sources) {
-        ObjectHelper.requireNonNull(sources, "sources is null");
+        Objects.requireNonNull(sources, "sources is null");
         return RxJavaPlugins.onAssembly(new ObservableConcatMap(sources, SingleInternalHelper.toObservable(), 2, ErrorMode.IMMEDIATE));
     }
 
@@ -260,7 +261,7 @@ public static <T> Flowable<T> concat(Publisher<? extends SingleSource<? extends
     @SchedulerSupport(SchedulerSupport.NONE)
     @SuppressWarnings({ "unchecked", "rawtypes" })
     public static <T> Flowable<T> concat(Publisher<? extends SingleSource<? extends T>> sources, int prefetch) {
-        ObjectHelper.requireNonNull(sources, "sources is null");
+        Objects.requireNonNull(sources, "sources is null");
         ObjectHelper.verifyPositive(prefetch, "prefetch");
         return RxJavaPlugins.onAssembly(new FlowableConcatMapPublisher(sources, SingleInternalHelper.toFlowable(), prefetch, ErrorMode.IMMEDIATE));
     }
@@ -292,8 +293,8 @@ public static <T> Flowable<T> concat(Publisher<? extends SingleSource<? extends
     public static <T> Flowable<T> concat(
             SingleSource<? extends T> source1, SingleSource<? extends T> source2
      ) {
-        ObjectHelper.requireNonNull(source1, "source1 is null");
-        ObjectHelper.requireNonNull(source2, "source2 is null");
+        Objects.requireNonNull(source1, "source1 is null");
+        Objects.requireNonNull(source2, "source2 is null");
         return concat(Flowable.fromArray(source1, source2));
     }
 
@@ -327,9 +328,9 @@ public static <T> Flowable<T> concat(
             SingleSource<? extends T> source1, SingleSource<? extends T> source2,
             SingleSource<? extends T> source3
      ) {
-        ObjectHelper.requireNonNull(source1, "source1 is null");
-        ObjectHelper.requireNonNull(source2, "source2 is null");
-        ObjectHelper.requireNonNull(source3, "source3 is null");
+        Objects.requireNonNull(source1, "source1 is null");
+        Objects.requireNonNull(source2, "source2 is null");
+        Objects.requireNonNull(source3, "source3 is null");
         return concat(Flowable.fromArray(source1, source2, source3));
     }
 
@@ -365,10 +366,10 @@ public static <T> Flowable<T> concat(
             SingleSource<? extends T> source1, SingleSource<? extends T> source2,
             SingleSource<? extends T> source3, SingleSource<? extends T> source4
      ) {
-        ObjectHelper.requireNonNull(source1, "source1 is null");
-        ObjectHelper.requireNonNull(source2, "source2 is null");
-        ObjectHelper.requireNonNull(source3, "source3 is null");
-        ObjectHelper.requireNonNull(source4, "source4 is null");
+        Objects.requireNonNull(source1, "source1 is null");
+        Objects.requireNonNull(source2, "source2 is null");
+        Objects.requireNonNull(source3, "source3 is null");
+        Objects.requireNonNull(source4, "source4 is null");
         return concat(Flowable.fromArray(source1, source2, source3, source4));
     }
 
@@ -523,7 +524,7 @@ public static <T> Flowable<T> concatEager(Iterable<? extends SingleSource<? exte
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public static <T> Single<T> create(SingleOnSubscribe<T> source) {
-        ObjectHelper.requireNonNull(source, "source is null");
+        Objects.requireNonNull(source, "source is null");
         return RxJavaPlugins.onAssembly(new SingleCreate<T>(source));
     }
 
@@ -545,7 +546,7 @@ public static <T> Single<T> create(SingleOnSubscribe<T> source) {
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public static <T> Single<T> defer(final Supplier<? extends SingleSource<? extends T>> singleSupplier) {
-        ObjectHelper.requireNonNull(singleSupplier, "singleSupplier is null");
+        Objects.requireNonNull(singleSupplier, "singleSupplier is null");
         return RxJavaPlugins.onAssembly(new SingleDefer<T>(singleSupplier));
     }
 
@@ -566,7 +567,7 @@ public static <T> Single<T> defer(final Supplier<? extends SingleSource<? extend
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public static <T> Single<T> error(final Supplier<? extends Throwable> errorSupplier) {
-        ObjectHelper.requireNonNull(errorSupplier, "errorSupplier is null");
+        Objects.requireNonNull(errorSupplier, "errorSupplier is null");
         return RxJavaPlugins.onAssembly(new SingleError<T>(errorSupplier));
     }
 
@@ -592,7 +593,7 @@ public static <T> Single<T> error(final Supplier<? extends Throwable> errorSuppl
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public static <T> Single<T> error(final Throwable exception) {
-        ObjectHelper.requireNonNull(exception, "exception is null");
+        Objects.requireNonNull(exception, "exception is null");
         return error(Functions.justSupplier(exception));
     }
 
@@ -628,7 +629,7 @@ public static <T> Single<T> error(final Throwable exception) {
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public static <T> Single<T> fromCallable(final Callable<? extends T> callable) {
-        ObjectHelper.requireNonNull(callable, "callable is null");
+        Objects.requireNonNull(callable, "callable is null");
         return RxJavaPlugins.onAssembly(new SingleFromCallable<T>(callable));
     }
 
@@ -793,7 +794,7 @@ public static <T> Single<T> fromFuture(Future<? extends T> future, Scheduler sch
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public static <T> Single<T> fromPublisher(final Publisher<? extends T> publisher) {
-        ObjectHelper.requireNonNull(publisher, "publisher is null");
+        Objects.requireNonNull(publisher, "publisher is null");
         return RxJavaPlugins.onAssembly(new SingleFromPublisher<T>(publisher));
     }
 
@@ -817,7 +818,7 @@ public static <T> Single<T> fromPublisher(final Publisher<? extends T> publisher
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public static <T> Single<T> fromObservable(ObservableSource<? extends T> observableSource) {
-        ObjectHelper.requireNonNull(observableSource, "observableSource is null");
+        Objects.requireNonNull(observableSource, "observableSource is null");
         return RxJavaPlugins.onAssembly(new ObservableSingleSingle<T>(observableSource, null));
     }
 
@@ -855,7 +856,7 @@ public static <T> Single<T> fromObservable(ObservableSource<? extends T> observa
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public static <T> Single<T> fromSupplier(final Supplier<? extends T> supplier) {
-        ObjectHelper.requireNonNull(supplier, "supplier is null");
+        Objects.requireNonNull(supplier, "supplier is null");
         return RxJavaPlugins.onAssembly(new SingleFromSupplier<T>(supplier));
     }
 
@@ -882,7 +883,7 @@ public static <T> Single<T> fromSupplier(final Supplier<? extends T> supplier) {
     @SchedulerSupport(SchedulerSupport.NONE)
     @NonNull
     public static <T> Single<T> just(final T item) {
-        ObjectHelper.requireNonNull(item, "item is null");
+        Objects.requireNonNull(item, "item is null");
         return RxJavaPlugins.onAssembly(new SingleJust<T>(item));
     }
 
@@ -960,7 +961,7 @@ public static <T> Flowable<T> merge(Iterable<? extends SingleSource<? extends T>
     @SchedulerSupport(SchedulerSupport.NONE)
     @SuppressWarnings({ "unchecked", "rawtypes" })
     public static <T> Flowable<T> merge(Publisher<? extends SingleSource<? extends T>> sources) {
-        ObjectHelper.requireNonNull(sources, "sources is null");
+        Objects.requireNonNull(sources, "sources is null");
         return RxJavaPlugins.onAssembly(new FlowableFlatMapPublisher(sources, SingleInternalHelper.toFlowable(), false, Integer.MAX_VALUE, Flowable.bufferSize()));
     }
 
@@ -991,7 +992,7 @@ public static <T> Flowable<T> merge(Publisher<? extends SingleSource<? extends T
     @SchedulerSupport(SchedulerSupport.NONE)
     @SuppressWarnings({ "unchecked", "rawtypes" })
     public static <T> Single<T> merge(SingleSource<? extends SingleSource<? extends T>> source) {
-        ObjectHelper.requireNonNull(source, "source is null");
+        Objects.requireNonNull(source, "source is null");
         return RxJavaPlugins.onAssembly(new SingleFlatMap<SingleSource<? extends T>, T>(source, (Function)Functions.identity()));
     }
 
@@ -1039,8 +1040,8 @@ public static <T> Single<T> merge(SingleSource<? extends SingleSource<? extends
     public static <T> Flowable<T> merge(
             SingleSource<? extends T> source1, SingleSource<? extends T> source2
      ) {
-        ObjectHelper.requireNonNull(source1, "source1 is null");
-        ObjectHelper.requireNonNull(source2, "source2 is null");
+        Objects.requireNonNull(source1, "source1 is null");
+        Objects.requireNonNull(source2, "source2 is null");
         return merge(Flowable.fromArray(source1, source2));
     }
 
@@ -1091,9 +1092,9 @@ public static <T> Flowable<T> merge(
             SingleSource<? extends T> source1, SingleSource<? extends T> source2,
             SingleSource<? extends T> source3
      ) {
-        ObjectHelper.requireNonNull(source1, "source1 is null");
-        ObjectHelper.requireNonNull(source2, "source2 is null");
-        ObjectHelper.requireNonNull(source3, "source3 is null");
+        Objects.requireNonNull(source1, "source1 is null");
+        Objects.requireNonNull(source2, "source2 is null");
+        Objects.requireNonNull(source3, "source3 is null");
         return merge(Flowable.fromArray(source1, source2, source3));
     }
 
@@ -1146,10 +1147,10 @@ public static <T> Flowable<T> merge(
             SingleSource<? extends T> source1, SingleSource<? extends T> source2,
             SingleSource<? extends T> source3, SingleSource<? extends T> source4
      ) {
-        ObjectHelper.requireNonNull(source1, "source1 is null");
-        ObjectHelper.requireNonNull(source2, "source2 is null");
-        ObjectHelper.requireNonNull(source3, "source3 is null");
-        ObjectHelper.requireNonNull(source4, "source4 is null");
+        Objects.requireNonNull(source1, "source1 is null");
+        Objects.requireNonNull(source2, "source2 is null");
+        Objects.requireNonNull(source3, "source3 is null");
+        Objects.requireNonNull(source4, "source4 is null");
         return merge(Flowable.fromArray(source1, source2, source3, source4));
     }
 
@@ -1203,7 +1204,7 @@ public static <T> Flowable<T> mergeDelayError(Iterable<? extends SingleSource<?
     @SchedulerSupport(SchedulerSupport.NONE)
     @SuppressWarnings({ "unchecked", "rawtypes" })
     public static <T> Flowable<T> mergeDelayError(Publisher<? extends SingleSource<? extends T>> sources) {
-        ObjectHelper.requireNonNull(sources, "sources is null");
+        Objects.requireNonNull(sources, "sources is null");
         return RxJavaPlugins.onAssembly(new FlowableFlatMapPublisher(sources, SingleInternalHelper.toFlowable(), true, Integer.MAX_VALUE, Flowable.bufferSize()));
     }
 
@@ -1240,8 +1241,8 @@ public static <T> Flowable<T> mergeDelayError(Publisher<? extends SingleSource<?
     public static <T> Flowable<T> mergeDelayError(
             SingleSource<? extends T> source1, SingleSource<? extends T> source2
      ) {
-        ObjectHelper.requireNonNull(source1, "source1 is null");
-        ObjectHelper.requireNonNull(source2, "source2 is null");
+        Objects.requireNonNull(source1, "source1 is null");
+        Objects.requireNonNull(source2, "source2 is null");
         return mergeDelayError(Flowable.fromArray(source1, source2));
     }
 
@@ -1281,9 +1282,9 @@ public static <T> Flowable<T> mergeDelayError(
             SingleSource<? extends T> source1, SingleSource<? extends T> source2,
             SingleSource<? extends T> source3
      ) {
-        ObjectHelper.requireNonNull(source1, "source1 is null");
-        ObjectHelper.requireNonNull(source2, "source2 is null");
-        ObjectHelper.requireNonNull(source3, "source3 is null");
+        Objects.requireNonNull(source1, "source1 is null");
+        Objects.requireNonNull(source2, "source2 is null");
+        Objects.requireNonNull(source3, "source3 is null");
         return mergeDelayError(Flowable.fromArray(source1, source2, source3));
     }
 
@@ -1325,10 +1326,10 @@ public static <T> Flowable<T> mergeDelayError(
             SingleSource<? extends T> source1, SingleSource<? extends T> source2,
             SingleSource<? extends T> source3, SingleSource<? extends T> source4
      ) {
-        ObjectHelper.requireNonNull(source1, "source1 is null");
-        ObjectHelper.requireNonNull(source2, "source2 is null");
-        ObjectHelper.requireNonNull(source3, "source3 is null");
-        ObjectHelper.requireNonNull(source4, "source4 is null");
+        Objects.requireNonNull(source1, "source1 is null");
+        Objects.requireNonNull(source2, "source2 is null");
+        Objects.requireNonNull(source3, "source3 is null");
+        Objects.requireNonNull(source4, "source4 is null");
         return mergeDelayError(Flowable.fromArray(source1, source2, source3, source4));
     }
 
@@ -1391,8 +1392,8 @@ public static Single<Long> timer(long delay, TimeUnit unit) {
     @NonNull
     @SchedulerSupport(SchedulerSupport.CUSTOM)
     public static Single<Long> timer(final long delay, final TimeUnit unit, final Scheduler scheduler) {
-        ObjectHelper.requireNonNull(unit, "unit is null");
-        ObjectHelper.requireNonNull(scheduler, "scheduler is null");
+        Objects.requireNonNull(unit, "unit is null");
+        Objects.requireNonNull(scheduler, "scheduler is null");
         return RxJavaPlugins.onAssembly(new SingleTimer(delay, unit, scheduler));
     }
 
@@ -1414,8 +1415,8 @@ public static Single<Long> timer(final long delay, final TimeUnit unit, final Sc
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public static <T> Single<Boolean> equals(final SingleSource<? extends T> first, final SingleSource<? extends T> second) { // NOPMD
-        ObjectHelper.requireNonNull(first, "first is null");
-        ObjectHelper.requireNonNull(second, "second is null");
+        Objects.requireNonNull(first, "first is null");
+        Objects.requireNonNull(second, "second is null");
         return RxJavaPlugins.onAssembly(new SingleEquals<T>(first, second));
     }
 
@@ -1440,7 +1441,7 @@ public static <T> Single<Boolean> equals(final SingleSource<? extends T> first,
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public static <T> Single<T> unsafeCreate(SingleSource<T> onSubscribe) {
-        ObjectHelper.requireNonNull(onSubscribe, "onSubscribe is null");
+        Objects.requireNonNull(onSubscribe, "onSubscribe is null");
         if (onSubscribe instanceof Single) {
             throw new IllegalArgumentException("unsafeCreate(Single) should be upgraded");
         }
@@ -1510,9 +1511,9 @@ public static <T, U> Single<T> using(
             final Function<? super U, ? extends SingleSource<? extends T>> singleFunction,
             final Consumer<? super U> disposer,
             final boolean eager) {
-        ObjectHelper.requireNonNull(resourceSupplier, "resourceSupplier is null");
-        ObjectHelper.requireNonNull(singleFunction, "singleFunction is null");
-        ObjectHelper.requireNonNull(disposer, "disposer is null");
+        Objects.requireNonNull(resourceSupplier, "resourceSupplier is null");
+        Objects.requireNonNull(singleFunction, "singleFunction is null");
+        Objects.requireNonNull(disposer, "disposer is null");
 
         return RxJavaPlugins.onAssembly(new SingleUsing<T, U>(resourceSupplier, singleFunction, disposer, eager));
     }
@@ -1534,7 +1535,7 @@ public static <T, U> Single<T> using(
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public static <T> Single<T> wrap(SingleSource<T> source) {
-        ObjectHelper.requireNonNull(source, "source is null");
+        Objects.requireNonNull(source, "source is null");
         if (source instanceof Single) {
             return RxJavaPlugins.onAssembly((Single<T>)source);
         }
@@ -1574,8 +1575,8 @@ public static <T> Single<T> wrap(SingleSource<T> source) {
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public static <T, R> Single<R> zip(final Iterable<? extends SingleSource<? extends T>> sources, Function<? super Object[], ? extends R> zipper) {
-        ObjectHelper.requireNonNull(zipper, "zipper is null");
-        ObjectHelper.requireNonNull(sources, "sources is null");
+        Objects.requireNonNull(zipper, "zipper is null");
+        Objects.requireNonNull(sources, "sources is null");
         return RxJavaPlugins.onAssembly(new SingleZipIterable<T, R>(sources, zipper));
     }
 
@@ -1610,8 +1611,8 @@ public static <T1, T2, R> Single<R> zip(
             SingleSource<? extends T1> source1, SingleSource<? extends T2> source2,
             BiFunction<? super T1, ? super T2, ? extends R> zipper
      ) {
-        ObjectHelper.requireNonNull(source1, "source1 is null");
-        ObjectHelper.requireNonNull(source2, "source2 is null");
+        Objects.requireNonNull(source1, "source1 is null");
+        Objects.requireNonNull(source2, "source2 is null");
         return zipArray(Functions.toFunction(zipper), source1, source2);
     }
 
@@ -1650,9 +1651,9 @@ public static <T1, T2, T3, R> Single<R> zip(
             SingleSource<? extends T3> source3,
             Function3<? super T1, ? super T2, ? super T3, ? extends R> zipper
      ) {
-        ObjectHelper.requireNonNull(source1, "source1 is null");
-        ObjectHelper.requireNonNull(source2, "source2 is null");
-        ObjectHelper.requireNonNull(source3, "source3 is null");
+        Objects.requireNonNull(source1, "source1 is null");
+        Objects.requireNonNull(source2, "source2 is null");
+        Objects.requireNonNull(source3, "source3 is null");
         return zipArray(Functions.toFunction(zipper), source1, source2, source3);
     }
 
@@ -1694,10 +1695,10 @@ public static <T1, T2, T3, T4, R> Single<R> zip(
             SingleSource<? extends T3> source3, SingleSource<? extends T4> source4,
             Function4<? super T1, ? super T2, ? super T3, ? super T4, ? extends R> zipper
      ) {
-        ObjectHelper.requireNonNull(source1, "source1 is null");
-        ObjectHelper.requireNonNull(source2, "source2 is null");
-        ObjectHelper.requireNonNull(source3, "source3 is null");
-        ObjectHelper.requireNonNull(source4, "source4 is null");
+        Objects.requireNonNull(source1, "source1 is null");
+        Objects.requireNonNull(source2, "source2 is null");
+        Objects.requireNonNull(source3, "source3 is null");
+        Objects.requireNonNull(source4, "source4 is null");
         return zipArray(Functions.toFunction(zipper), source1, source2, source3, source4);
     }
 
@@ -1743,11 +1744,11 @@ public static <T1, T2, T3, T4, T5, R> Single<R> zip(
             SingleSource<? extends T5> source5,
             Function5<? super T1, ? super T2, ? super T3, ? super T4, ? super T5, ? extends R> zipper
      ) {
-        ObjectHelper.requireNonNull(source1, "source1 is null");
-        ObjectHelper.requireNonNull(source2, "source2 is null");
-        ObjectHelper.requireNonNull(source3, "source3 is null");
-        ObjectHelper.requireNonNull(source4, "source4 is null");
-        ObjectHelper.requireNonNull(source5, "source5 is null");
+        Objects.requireNonNull(source1, "source1 is null");
+        Objects.requireNonNull(source2, "source2 is null");
+        Objects.requireNonNull(source3, "source3 is null");
+        Objects.requireNonNull(source4, "source4 is null");
+        Objects.requireNonNull(source5, "source5 is null");
         return zipArray(Functions.toFunction(zipper), source1, source2, source3, source4, source5);
     }
 
@@ -1796,12 +1797,12 @@ public static <T1, T2, T3, T4, T5, T6, R> Single<R> zip(
             SingleSource<? extends T5> source5, SingleSource<? extends T6> source6,
             Function6<? super T1, ? super T2, ? super T3, ? super T4, ? super T5, ? super T6, ? extends R> zipper
      ) {
-        ObjectHelper.requireNonNull(source1, "source1 is null");
-        ObjectHelper.requireNonNull(source2, "source2 is null");
-        ObjectHelper.requireNonNull(source3, "source3 is null");
-        ObjectHelper.requireNonNull(source4, "source4 is null");
-        ObjectHelper.requireNonNull(source5, "source5 is null");
-        ObjectHelper.requireNonNull(source6, "source6 is null");
+        Objects.requireNonNull(source1, "source1 is null");
+        Objects.requireNonNull(source2, "source2 is null");
+        Objects.requireNonNull(source3, "source3 is null");
+        Objects.requireNonNull(source4, "source4 is null");
+        Objects.requireNonNull(source5, "source5 is null");
+        Objects.requireNonNull(source6, "source6 is null");
         return zipArray(Functions.toFunction(zipper), source1, source2, source3, source4, source5, source6);
     }
 
@@ -1854,13 +1855,13 @@ public static <T1, T2, T3, T4, T5, T6, T7, R> Single<R> zip(
             SingleSource<? extends T7> source7,
             Function7<? super T1, ? super T2, ? super T3, ? super T4, ? super T5, ? super T6, ? super T7, ? extends R> zipper
      ) {
-        ObjectHelper.requireNonNull(source1, "source1 is null");
-        ObjectHelper.requireNonNull(source2, "source2 is null");
-        ObjectHelper.requireNonNull(source3, "source3 is null");
-        ObjectHelper.requireNonNull(source4, "source4 is null");
-        ObjectHelper.requireNonNull(source5, "source5 is null");
-        ObjectHelper.requireNonNull(source6, "source6 is null");
-        ObjectHelper.requireNonNull(source7, "source7 is null");
+        Objects.requireNonNull(source1, "source1 is null");
+        Objects.requireNonNull(source2, "source2 is null");
+        Objects.requireNonNull(source3, "source3 is null");
+        Objects.requireNonNull(source4, "source4 is null");
+        Objects.requireNonNull(source5, "source5 is null");
+        Objects.requireNonNull(source6, "source6 is null");
+        Objects.requireNonNull(source7, "source7 is null");
         return zipArray(Functions.toFunction(zipper), source1, source2, source3, source4, source5, source6, source7);
     }
 
@@ -1916,14 +1917,14 @@ public static <T1, T2, T3, T4, T5, T6, T7, T8, R> Single<R> zip(
             SingleSource<? extends T7> source7, SingleSource<? extends T8> source8,
             Function8<? super T1, ? super T2, ? super T3, ? super T4, ? super T5, ? super T6, ? super T7, ? super T8, ? extends R> zipper
      ) {
-        ObjectHelper.requireNonNull(source1, "source1 is null");
-        ObjectHelper.requireNonNull(source2, "source2 is null");
-        ObjectHelper.requireNonNull(source3, "source3 is null");
-        ObjectHelper.requireNonNull(source4, "source4 is null");
-        ObjectHelper.requireNonNull(source5, "source5 is null");
-        ObjectHelper.requireNonNull(source6, "source6 is null");
-        ObjectHelper.requireNonNull(source7, "source7 is null");
-        ObjectHelper.requireNonNull(source8, "source8 is null");
+        Objects.requireNonNull(source1, "source1 is null");
+        Objects.requireNonNull(source2, "source2 is null");
+        Objects.requireNonNull(source3, "source3 is null");
+        Objects.requireNonNull(source4, "source4 is null");
+        Objects.requireNonNull(source5, "source5 is null");
+        Objects.requireNonNull(source6, "source6 is null");
+        Objects.requireNonNull(source7, "source7 is null");
+        Objects.requireNonNull(source8, "source8 is null");
         return zipArray(Functions.toFunction(zipper), source1, source2, source3, source4, source5, source6, source7, source8);
     }
 
@@ -1983,15 +1984,15 @@ public static <T1, T2, T3, T4, T5, T6, T7, T8, T9, R> Single<R> zip(
             SingleSource<? extends T9> source9,
             Function9<? super T1, ? super T2, ? super T3, ? super T4, ? super T5, ? super T6, ? super T7, ? super T8, ? super T9, ? extends R> zipper
      ) {
-        ObjectHelper.requireNonNull(source1, "source1 is null");
-        ObjectHelper.requireNonNull(source2, "source2 is null");
-        ObjectHelper.requireNonNull(source3, "source3 is null");
-        ObjectHelper.requireNonNull(source4, "source4 is null");
-        ObjectHelper.requireNonNull(source5, "source5 is null");
-        ObjectHelper.requireNonNull(source6, "source6 is null");
-        ObjectHelper.requireNonNull(source7, "source7 is null");
-        ObjectHelper.requireNonNull(source8, "source8 is null");
-        ObjectHelper.requireNonNull(source9, "source9 is null");
+        Objects.requireNonNull(source1, "source1 is null");
+        Objects.requireNonNull(source2, "source2 is null");
+        Objects.requireNonNull(source3, "source3 is null");
+        Objects.requireNonNull(source4, "source4 is null");
+        Objects.requireNonNull(source5, "source5 is null");
+        Objects.requireNonNull(source6, "source6 is null");
+        Objects.requireNonNull(source7, "source7 is null");
+        Objects.requireNonNull(source8, "source8 is null");
+        Objects.requireNonNull(source9, "source9 is null");
         return zipArray(Functions.toFunction(zipper), source1, source2, source3, source4, source5, source6, source7, source8, source9);
     }
 
@@ -2027,8 +2028,8 @@ public static <T1, T2, T3, T4, T5, T6, T7, T8, T9, R> Single<R> zip(
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public static <T, R> Single<R> zipArray(Function<? super Object[], ? extends R> zipper, SingleSource<? extends T>... sources) {
-        ObjectHelper.requireNonNull(zipper, "zipper is null");
-        ObjectHelper.requireNonNull(sources, "sources is null");
+        Objects.requireNonNull(zipper, "zipper is null");
+        Objects.requireNonNull(sources, "sources is null");
         if (sources.length == 0) {
             return error(new NoSuchElementException());
         }
@@ -2053,7 +2054,7 @@ public static <T, R> Single<R> zipArray(Function<? super Object[], ? extends R>
     @SchedulerSupport(SchedulerSupport.NONE)
     @SuppressWarnings("unchecked")
     public final Single<T> ambWith(SingleSource<? extends T> other) {
-        ObjectHelper.requireNonNull(other, "other is null");
+        Objects.requireNonNull(other, "other is null");
         return ambArray(this, other);
     }
 
@@ -2099,7 +2100,7 @@ public final Single<T> hide() {
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <R> Single<R> compose(SingleTransformer<? super T, ? extends R> transformer) {
-        return wrap(((SingleTransformer<T, R>) ObjectHelper.requireNonNull(transformer, "transformer is null")).apply(this));
+        return wrap(((SingleTransformer<T, R>) Objects.requireNonNull(transformer, "transformer is null")).apply(this));
     }
 
     /**
@@ -2140,7 +2141,7 @@ public final Single<T> cache() {
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <U> Single<U> cast(final Class<? extends U> clazz) {
-        ObjectHelper.requireNonNull(clazz, "clazz is null");
+        Objects.requireNonNull(clazz, "clazz is null");
         return map(Functions.castFunction(clazz));
     }
 
@@ -2259,8 +2260,8 @@ public final Single<T> delay(final long time, final TimeUnit unit, final Schedul
     @NonNull
     @SchedulerSupport(SchedulerSupport.CUSTOM)
     public final Single<T> delay(final long time, final TimeUnit unit, final Scheduler scheduler, boolean delayError) {
-        ObjectHelper.requireNonNull(unit, "unit is null");
-        ObjectHelper.requireNonNull(scheduler, "scheduler is null");
+        Objects.requireNonNull(unit, "unit is null");
+        Objects.requireNonNull(scheduler, "scheduler is null");
         return RxJavaPlugins.onAssembly(new SingleDelay<T>(this, time, unit, scheduler, delayError));
     }
 
@@ -2284,7 +2285,7 @@ public final Single<T> delay(final long time, final TimeUnit unit, final Schedul
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Single<T> delaySubscription(CompletableSource other) {
-        ObjectHelper.requireNonNull(other, "other is null");
+        Objects.requireNonNull(other, "other is null");
         return RxJavaPlugins.onAssembly(new SingleDelayWithCompletable<T>(this, other));
     }
 
@@ -2309,7 +2310,7 @@ public final Single<T> delaySubscription(CompletableSource other) {
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <U> Single<T> delaySubscription(SingleSource<U> other) {
-        ObjectHelper.requireNonNull(other, "other is null");
+        Objects.requireNonNull(other, "other is null");
         return RxJavaPlugins.onAssembly(new SingleDelayWithSingle<T, U>(this, other));
     }
 
@@ -2334,7 +2335,7 @@ public final <U> Single<T> delaySubscription(SingleSource<U> other) {
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <U> Single<T> delaySubscription(ObservableSource<U> other) {
-        ObjectHelper.requireNonNull(other, "other is null");
+        Objects.requireNonNull(other, "other is null");
         return RxJavaPlugins.onAssembly(new SingleDelayWithObservable<T, U>(this, other));
     }
 
@@ -2364,7 +2365,7 @@ public final <U> Single<T> delaySubscription(ObservableSource<U> other) {
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <U> Single<T> delaySubscription(Publisher<U> other) {
-        ObjectHelper.requireNonNull(other, "other is null");
+        Objects.requireNonNull(other, "other is null");
         return RxJavaPlugins.onAssembly(new SingleDelayWithPublisher<T, U>(this, other));
     }
 
@@ -2445,7 +2446,7 @@ public final Single<T> delaySubscription(long time, TimeUnit unit, Scheduler sch
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <R> Maybe<R> dematerialize(Function<? super T, Notification<R>> selector) {
-        ObjectHelper.requireNonNull(selector, "selector is null");
+        Objects.requireNonNull(selector, "selector is null");
         return RxJavaPlugins.onAssembly(new SingleDematerialize<T, R>(this, selector));
     }
 
@@ -2469,7 +2470,7 @@ public final <R> Maybe<R> dematerialize(Function<? super T, Notification<R>> sel
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Single<T> doAfterSuccess(Consumer<? super T> onAfterSuccess) {
-        ObjectHelper.requireNonNull(onAfterSuccess, "onAfterSuccess is null");
+        Objects.requireNonNull(onAfterSuccess, "onAfterSuccess is null");
         return RxJavaPlugins.onAssembly(new SingleDoAfterSuccess<T>(this, onAfterSuccess));
     }
 
@@ -2498,7 +2499,7 @@ public final Single<T> doAfterSuccess(Consumer<? super T> onAfterSuccess) {
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Single<T> doAfterTerminate(Action onAfterTerminate) {
-        ObjectHelper.requireNonNull(onAfterTerminate, "onAfterTerminate is null");
+        Objects.requireNonNull(onAfterTerminate, "onAfterTerminate is null");
         return RxJavaPlugins.onAssembly(new SingleDoAfterTerminate<T>(this, onAfterTerminate));
     }
 
@@ -2525,7 +2526,7 @@ public final Single<T> doAfterTerminate(Action onAfterTerminate) {
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Single<T> doFinally(Action onFinally) {
-        ObjectHelper.requireNonNull(onFinally, "onFinally is null");
+        Objects.requireNonNull(onFinally, "onFinally is null");
         return RxJavaPlugins.onAssembly(new SingleDoFinally<T>(this, onFinally));
     }
 
@@ -2547,7 +2548,7 @@ public final Single<T> doFinally(Action onFinally) {
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Single<T> doOnSubscribe(final Consumer<? super Disposable> onSubscribe) {
-        ObjectHelper.requireNonNull(onSubscribe, "onSubscribe is null");
+        Objects.requireNonNull(onSubscribe, "onSubscribe is null");
         return RxJavaPlugins.onAssembly(new SingleDoOnSubscribe<T>(this, onSubscribe));
     }
 
@@ -2574,7 +2575,7 @@ public final Single<T> doOnSubscribe(final Consumer<? super Disposable> onSubscr
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Single<T> doOnTerminate(final Action onTerminate) {
-        ObjectHelper.requireNonNull(onTerminate, "onTerminate is null");
+        Objects.requireNonNull(onTerminate, "onTerminate is null");
         return RxJavaPlugins.onAssembly(new SingleDoOnTerminate<T>(this, onTerminate));
     }
 
@@ -2596,7 +2597,7 @@ public final Single<T> doOnTerminate(final Action onTerminate) {
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Single<T> doOnSuccess(final Consumer<? super T> onSuccess) {
-        ObjectHelper.requireNonNull(onSuccess, "onSuccess is null");
+        Objects.requireNonNull(onSuccess, "onSuccess is null");
         return RxJavaPlugins.onAssembly(new SingleDoOnSuccess<T>(this, onSuccess));
     }
 
@@ -2617,7 +2618,7 @@ public final Single<T> doOnSuccess(final Consumer<? super T> onSuccess) {
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Single<T> doOnEvent(final BiConsumer<? super T, ? super Throwable> onEvent) {
-        ObjectHelper.requireNonNull(onEvent, "onEvent is null");
+        Objects.requireNonNull(onEvent, "onEvent is null");
         return RxJavaPlugins.onAssembly(new SingleDoOnEvent<T>(this, onEvent));
     }
 
@@ -2639,7 +2640,7 @@ public final Single<T> doOnEvent(final BiConsumer<? super T, ? super Throwable>
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Single<T> doOnError(final Consumer<? super Throwable> onError) {
-        ObjectHelper.requireNonNull(onError, "onError is null");
+        Objects.requireNonNull(onError, "onError is null");
         return RxJavaPlugins.onAssembly(new SingleDoOnError<T>(this, onError));
     }
 
@@ -2662,7 +2663,7 @@ public final Single<T> doOnError(final Consumer<? super Throwable> onError) {
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Single<T> doOnDispose(final Action onDispose) {
-        ObjectHelper.requireNonNull(onDispose, "onDispose is null");
+        Objects.requireNonNull(onDispose, "onDispose is null");
         return RxJavaPlugins.onAssembly(new SingleDoOnDispose<T>(this, onDispose));
     }
 
@@ -2687,7 +2688,7 @@ public final Single<T> doOnDispose(final Action onDispose) {
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Maybe<T> filter(Predicate<? super T> predicate) {
-        ObjectHelper.requireNonNull(predicate, "predicate is null");
+        Objects.requireNonNull(predicate, "predicate is null");
         return RxJavaPlugins.onAssembly(new MaybeFilterSingle<T>(this, predicate));
     }
 
@@ -2711,7 +2712,7 @@ public final Maybe<T> filter(Predicate<? super T> predicate) {
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <R> Single<R> flatMap(Function<? super T, ? extends SingleSource<? extends R>> mapper) {
-        ObjectHelper.requireNonNull(mapper, "mapper is null");
+        Objects.requireNonNull(mapper, "mapper is null");
         return RxJavaPlugins.onAssembly(new SingleFlatMap<T, R>(this, mapper));
     }
 
@@ -2735,7 +2736,7 @@ public final <R> Single<R> flatMap(Function<? super T, ? extends SingleSource<?
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <R> Maybe<R> flatMapMaybe(final Function<? super T, ? extends MaybeSource<? extends R>> mapper) {
-        ObjectHelper.requireNonNull(mapper, "mapper is null");
+        Objects.requireNonNull(mapper, "mapper is null");
         return RxJavaPlugins.onAssembly(new SingleFlatMapMaybe<T, R>(this, mapper));
     }
 
@@ -2764,7 +2765,7 @@ public final <R> Maybe<R> flatMapMaybe(final Function<? super T, ? extends Maybe
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <R> Flowable<R> flatMapPublisher(Function<? super T, ? extends Publisher<? extends R>> mapper) {
-        ObjectHelper.requireNonNull(mapper, "mapper is null");
+        Objects.requireNonNull(mapper, "mapper is null");
         return RxJavaPlugins.onAssembly(new SingleFlatMapPublisher<T, R>(this, mapper));
     }
 
@@ -2793,7 +2794,7 @@ public final <R> Flowable<R> flatMapPublisher(Function<? super T, ? extends Publ
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <U> Flowable<U> flattenAsFlowable(final Function<? super T, ? extends Iterable<? extends U>> mapper) {
-        ObjectHelper.requireNonNull(mapper, "mapper is null");
+        Objects.requireNonNull(mapper, "mapper is null");
         return RxJavaPlugins.onAssembly(new SingleFlatMapIterableFlowable<T, U>(this, mapper));
     }
 
@@ -2819,7 +2820,7 @@ public final <U> Flowable<U> flattenAsFlowable(final Function<? super T, ? exten
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <U> Observable<U> flattenAsObservable(final Function<? super T, ? extends Iterable<? extends U>> mapper) {
-        ObjectHelper.requireNonNull(mapper, "mapper is null");
+        Objects.requireNonNull(mapper, "mapper is null");
         return RxJavaPlugins.onAssembly(new SingleFlatMapIterableObservable<T, U>(this, mapper));
     }
 
@@ -2843,7 +2844,7 @@ public final <U> Observable<U> flattenAsObservable(final Function<? super T, ? e
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <R> Observable<R> flatMapObservable(Function<? super T, ? extends ObservableSource<? extends R>> mapper) {
-        ObjectHelper.requireNonNull(mapper, "mapper is null");
+        Objects.requireNonNull(mapper, "mapper is null");
         return RxJavaPlugins.onAssembly(new SingleFlatMapObservable<T, R>(this, mapper));
     }
 
@@ -2868,7 +2869,7 @@ public final <R> Observable<R> flatMapObservable(Function<? super T, ? extends O
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Completable flatMapCompletable(final Function<? super T, ? extends CompletableSource> mapper) {
-        ObjectHelper.requireNonNull(mapper, "mapper is null");
+        Objects.requireNonNull(mapper, "mapper is null");
         return RxJavaPlugins.onAssembly(new SingleFlatMapCompletable<T>(this, mapper));
     }
 
@@ -3042,7 +3043,7 @@ public final T blockingGet() {
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <R> Single<R> lift(final SingleOperator<? extends R, ? super T> lift) {
-        ObjectHelper.requireNonNull(lift, "lift is null");
+        Objects.requireNonNull(lift, "lift is null");
         return RxJavaPlugins.onAssembly(new SingleLift<T, R>(this, lift));
     }
 
@@ -3066,7 +3067,7 @@ public final <R> Single<R> lift(final SingleOperator<? extends R, ? super T> lif
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <R> Single<R> map(Function<? super T, ? extends R> mapper) {
-        ObjectHelper.requireNonNull(mapper, "mapper is null");
+        Objects.requireNonNull(mapper, "mapper is null");
         return RxJavaPlugins.onAssembly(new SingleMap<T, R>(this, mapper));
     }
 
@@ -3130,8 +3131,8 @@ public final Single<Boolean> contains(Object value) {
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Single<Boolean> contains(final Object value, final BiPredicate<Object, Object> comparer) {
-        ObjectHelper.requireNonNull(value, "value is null");
-        ObjectHelper.requireNonNull(comparer, "comparer is null");
+        Objects.requireNonNull(value, "value is null");
+        Objects.requireNonNull(comparer, "comparer is null");
         return RxJavaPlugins.onAssembly(new SingleContains<T>(this, value, comparer));
     }
 
@@ -3184,7 +3185,7 @@ public final Flowable<T> mergeWith(SingleSource<? extends T> other) {
     @NonNull
     @SchedulerSupport(SchedulerSupport.CUSTOM)
     public final Single<T> observeOn(final Scheduler scheduler) {
-        ObjectHelper.requireNonNull(scheduler, "scheduler is null");
+        Objects.requireNonNull(scheduler, "scheduler is null");
         return RxJavaPlugins.onAssembly(new SingleObserveOn<T>(this, scheduler));
     }
 
@@ -3218,7 +3219,7 @@ public final Single<T> observeOn(final Scheduler scheduler) {
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Single<T> onErrorReturn(final Function<Throwable, ? extends T> resumeFunction) {
-        ObjectHelper.requireNonNull(resumeFunction, "resumeFunction is null");
+        Objects.requireNonNull(resumeFunction, "resumeFunction is null");
         return RxJavaPlugins.onAssembly(new SingleOnErrorReturn<T>(this, resumeFunction, null));
     }
 
@@ -3238,7 +3239,7 @@ public final Single<T> onErrorReturn(final Function<Throwable, ? extends T> resu
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Single<T> onErrorReturnItem(final T value) {
-        ObjectHelper.requireNonNull(value, "value is null");
+        Objects.requireNonNull(value, "value is null");
         return RxJavaPlugins.onAssembly(new SingleOnErrorReturn<T>(this, null, value));
     }
 
@@ -3273,7 +3274,7 @@ public final Single<T> onErrorReturnItem(final T value) {
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Single<T> onErrorResumeWith(final SingleSource<? extends T> resumeSingleInCaseOfError) {
-        ObjectHelper.requireNonNull(resumeSingleInCaseOfError, "resumeSingleInCaseOfError is null");
+        Objects.requireNonNull(resumeSingleInCaseOfError, "resumeSingleInCaseOfError is null");
         return onErrorResumeNext(Functions.justFunction(resumeSingleInCaseOfError));
     }
 
@@ -3310,7 +3311,7 @@ public final Single<T> onErrorResumeWith(final SingleSource<? extends T> resumeS
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Single<T> onErrorResumeNext(
             final Function<? super Throwable, ? extends SingleSource<? extends T>> resumeFunctionInCaseOfError) {
-        ObjectHelper.requireNonNull(resumeFunctionInCaseOfError, "resumeFunctionInCaseOfError is null");
+        Objects.requireNonNull(resumeFunctionInCaseOfError, "resumeFunctionInCaseOfError is null");
         return RxJavaPlugins.onAssembly(new SingleResumeNext<T>(this, resumeFunctionInCaseOfError));
     }
 
@@ -3614,7 +3615,7 @@ public final Disposable subscribe() {
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Disposable subscribe(final BiConsumer<? super T, ? super Throwable> onCallback) {
-        ObjectHelper.requireNonNull(onCallback, "onCallback is null");
+        Objects.requireNonNull(onCallback, "onCallback is null");
 
         BiConsumerSingleObserver<T> observer = new BiConsumerSingleObserver<T>(onCallback);
         subscribe(observer);
@@ -3672,8 +3673,8 @@ public final Disposable subscribe(Consumer<? super T> onSuccess) {
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Disposable subscribe(final Consumer<? super T> onSuccess, final Consumer<? super Throwable> onError) {
-        ObjectHelper.requireNonNull(onSuccess, "onSuccess is null");
-        ObjectHelper.requireNonNull(onError, "onError is null");
+        Objects.requireNonNull(onSuccess, "onSuccess is null");
+        Objects.requireNonNull(onError, "onError is null");
 
         ConsumerSingleObserver<T> observer = new ConsumerSingleObserver<T>(onSuccess, onError);
         subscribe(observer);
@@ -3683,11 +3684,11 @@ public final Disposable subscribe(final Consumer<? super T> onSuccess, final Con
     @SchedulerSupport(SchedulerSupport.NONE)
     @Override
     public final void subscribe(SingleObserver<? super T> observer) {
-        ObjectHelper.requireNonNull(observer, "observer is null");
+        Objects.requireNonNull(observer, "observer is null");
 
         observer = RxJavaPlugins.onSubscribe(this, observer);
 
-        ObjectHelper.requireNonNull(observer, "The RxJavaPlugins.onSubscribe hook returned a null SingleObserver. Please check the handler provided to RxJavaPlugins.setOnSingleSubscribe for invalid null returns. Further reading: https://github.com/ReactiveX/RxJava/wiki/Plugins");
+        Objects.requireNonNull(observer, "The RxJavaPlugins.onSubscribe hook returned a null SingleObserver. Please check the handler provided to RxJavaPlugins.setOnSingleSubscribe for invalid null returns. Further reading: https://github.com/ReactiveX/RxJava/wiki/Plugins");
 
         try {
             subscribeActual(observer);
@@ -3763,7 +3764,7 @@ public final <E extends SingleObserver<? super T>> E subscribeWith(E observer) {
     @NonNull
     @SchedulerSupport(SchedulerSupport.CUSTOM)
     public final Single<T> subscribeOn(final Scheduler scheduler) {
-        ObjectHelper.requireNonNull(scheduler, "scheduler is null");
+        Objects.requireNonNull(scheduler, "scheduler is null");
         return RxJavaPlugins.onAssembly(new SingleSubscribeOn<T>(this, scheduler));
     }
 
@@ -3788,7 +3789,7 @@ public final Single<T> subscribeOn(final Scheduler scheduler) {
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Single<T> takeUntil(final CompletableSource other) {
-        ObjectHelper.requireNonNull(other, "other is null");
+        Objects.requireNonNull(other, "other is null");
         return takeUntil(new CompletableToFlowable<T>(other));
     }
 
@@ -3820,7 +3821,7 @@ public final Single<T> takeUntil(final CompletableSource other) {
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <E> Single<T> takeUntil(final Publisher<E> other) {
-        ObjectHelper.requireNonNull(other, "other is null");
+        Objects.requireNonNull(other, "other is null");
         return RxJavaPlugins.onAssembly(new SingleTakeUntil<T, E>(this, other));
     }
 
@@ -3846,7 +3847,7 @@ public final <E> Single<T> takeUntil(final Publisher<E> other) {
     @NonNull
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <E> Single<T> takeUntil(final SingleSource<? extends E> other) {
-        ObjectHelper.requireNonNull(other, "other is null");
+        Objects.requireNonNull(other, "other is null");
         return takeUntil(new SingleToFlowable<E>(other));
     }
 
@@ -3912,7 +3913,7 @@ public final Single<T> timeout(long timeout, TimeUnit unit, Scheduler scheduler)
     @NonNull
     @SchedulerSupport(SchedulerSupport.CUSTOM)
     public final Single<T> timeout(long timeout, TimeUnit unit, Scheduler scheduler, SingleSource<? extends T> other) {
-        ObjectHelper.requireNonNull(other, "other is null");
+        Objects.requireNonNull(other, "other is null");
         return timeout0(timeout, unit, scheduler, other);
     }
 
@@ -3940,13 +3941,13 @@ public final Single<T> timeout(long timeout, TimeUnit unit, Scheduler scheduler,
     @NonNull
     @SchedulerSupport(SchedulerSupport.COMPUTATION)
     public final Single<T> timeout(long timeout, TimeUnit unit, SingleSource<? extends T> other) {
-        ObjectHelper.requireNonNull(other, "other is null");
+        Objects.requireNonNull(other, "other is null");
         return timeout0(timeout, unit, Schedulers.computation(), other);
     }
 
     private Single<T> timeout0(final long timeout, final TimeUnit unit, final Scheduler scheduler, final SingleSource<? extends T> other) {
-        ObjectHelper.requireNonNull(unit, "unit is null");
-        ObjectHelper.requireNonNull(scheduler, "scheduler is null");
+        Objects.requireNonNull(unit, "unit is null");
+        Objects.requireNonNull(scheduler, "scheduler is null");
         return RxJavaPlugins.onAssembly(new SingleTimeout<T>(this, timeout, unit, scheduler, other));
     }
 
@@ -3970,7 +3971,7 @@ private Single<T> timeout0(final long timeout, final TimeUnit unit, final Schedu
     @CheckReturnValue
     @SchedulerSupport(SchedulerSupport.NONE)
     public final <R> R to(@NonNull SingleConverter<T, ? extends R> converter) {
-        return ObjectHelper.requireNonNull(converter, "converter is null").apply(this);
+        return Objects.requireNonNull(converter, "converter is null").apply(this);
     }
 
     /**
@@ -4095,7 +4096,7 @@ public final Observable<T> toObservable() {
     @NonNull
     @SchedulerSupport(SchedulerSupport.CUSTOM)
     public final Single<T> unsubscribeOn(final Scheduler scheduler) {
-        ObjectHelper.requireNonNull(scheduler, "scheduler is null");
+        Objects.requireNonNull(scheduler, "scheduler is null");
         return RxJavaPlugins.onAssembly(new SingleUnsubscribeOn<T>(this, scheduler));
     }
 
diff --git a/src/main/java/io/reactivex/rxjava3/disposables/CompositeDisposable.java b/src/main/java/io/reactivex/rxjava3/disposables/CompositeDisposable.java
index 245c41305b..c9c0a8988c 100644
--- a/src/main/java/io/reactivex/rxjava3/disposables/CompositeDisposable.java
+++ b/src/main/java/io/reactivex/rxjava3/disposables/CompositeDisposable.java
@@ -16,7 +16,6 @@
 
 import io.reactivex.rxjava3.annotations.NonNull;
 import io.reactivex.rxjava3.exceptions.*;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.internal.util.*;
 
 /**
@@ -41,10 +40,10 @@ public CompositeDisposable() {
      * @throws NullPointerException if {@code disposables} or any of its array items is null
      */
     public CompositeDisposable(@NonNull Disposable... disposables) {
-        ObjectHelper.requireNonNull(disposables, "disposables is null");
+        Objects.requireNonNull(disposables, "disposables is null");
         this.resources = new OpenHashSet<Disposable>(disposables.length + 1);
         for (Disposable d : disposables) {
-            ObjectHelper.requireNonNull(d, "A Disposable in the disposables array is null");
+            Objects.requireNonNull(d, "A Disposable in the disposables array is null");
             this.resources.add(d);
         }
     }
@@ -55,10 +54,10 @@ public CompositeDisposable(@NonNull Disposable... disposables) {
      * @throws NullPointerException if {@code disposables} or any of its items is null
      */
     public CompositeDisposable(@NonNull Iterable<? extends Disposable> disposables) {
-        ObjectHelper.requireNonNull(disposables, "disposables is null");
+        Objects.requireNonNull(disposables, "disposables is null");
         this.resources = new OpenHashSet<Disposable>();
         for (Disposable d : disposables) {
-            ObjectHelper.requireNonNull(d, "A Disposable item in the disposables sequence is null");
+            Objects.requireNonNull(d, "A Disposable item in the disposables sequence is null");
             this.resources.add(d);
         }
     }
@@ -95,7 +94,7 @@ public boolean isDisposed() {
      */
     @Override
     public boolean add(@NonNull Disposable disposable) {
-        ObjectHelper.requireNonNull(disposable, "disposable is null");
+        Objects.requireNonNull(disposable, "disposable is null");
         if (!disposed) {
             synchronized (this) {
                 if (!disposed) {
@@ -121,7 +120,7 @@ public boolean add(@NonNull Disposable disposable) {
      * @throws NullPointerException if {@code disposables} or any of its array items is null
      */
     public boolean addAll(@NonNull Disposable... disposables) {
-        ObjectHelper.requireNonNull(disposables, "disposables is null");
+        Objects.requireNonNull(disposables, "disposables is null");
         if (!disposed) {
             synchronized (this) {
                 if (!disposed) {
@@ -131,7 +130,7 @@ public boolean addAll(@NonNull Disposable... disposables) {
                         resources = set;
                     }
                     for (Disposable d : disposables) {
-                        ObjectHelper.requireNonNull(d, "A Disposable in the disposables array is null");
+                        Objects.requireNonNull(d, "A Disposable in the disposables array is null");
                         set.add(d);
                     }
                     return true;
@@ -168,7 +167,7 @@ public boolean remove(@NonNull Disposable disposable) {
      */
     @Override
     public boolean delete(@NonNull Disposable disposable) {
-        ObjectHelper.requireNonNull(disposable, "disposables is null");
+        Objects.requireNonNull(disposable, "disposables is null");
         if (disposed) {
             return false;
         }
diff --git a/src/main/java/io/reactivex/rxjava3/disposables/Disposables.java b/src/main/java/io/reactivex/rxjava3/disposables/Disposables.java
index d566b744f4..2ff83d64ff 100644
--- a/src/main/java/io/reactivex/rxjava3/disposables/Disposables.java
+++ b/src/main/java/io/reactivex/rxjava3/disposables/Disposables.java
@@ -13,6 +13,7 @@
 
 package io.reactivex.rxjava3.disposables;
 
+import java.util.Objects;
 import java.util.concurrent.Future;
 
 import org.reactivestreams.Subscription;
@@ -41,7 +42,7 @@ private Disposables() {
      */
     @NonNull
     public static Disposable fromRunnable(@NonNull Runnable run) {
-        ObjectHelper.requireNonNull(run, "run is null");
+        Objects.requireNonNull(run, "run is null");
         return new RunnableDisposable(run);
     }
 
@@ -53,7 +54,7 @@ public static Disposable fromRunnable(@NonNull Runnable run) {
      */
     @NonNull
     public static Disposable fromAction(@NonNull Action run) {
-        ObjectHelper.requireNonNull(run, "run is null");
+        Objects.requireNonNull(run, "run is null");
         return new ActionDisposable(run);
     }
 
@@ -65,7 +66,7 @@ public static Disposable fromAction(@NonNull Action run) {
      */
     @NonNull
     public static Disposable fromFuture(@NonNull Future<?> future) {
-        ObjectHelper.requireNonNull(future, "future is null");
+        Objects.requireNonNull(future, "future is null");
         return fromFuture(future, true);
     }
 
@@ -78,7 +79,7 @@ public static Disposable fromFuture(@NonNull Future<?> future) {
      */
     @NonNull
     public static Disposable fromFuture(@NonNull Future<?> future, boolean allowInterrupt) {
-        ObjectHelper.requireNonNull(future, "future is null");
+        Objects.requireNonNull(future, "future is null");
         return new FutureDisposable(future, allowInterrupt);
     }
 
@@ -90,7 +91,7 @@ public static Disposable fromFuture(@NonNull Future<?> future, boolean allowInte
      */
     @NonNull
     public static Disposable fromSubscription(@NonNull Subscription subscription) {
-        ObjectHelper.requireNonNull(subscription, "subscription is null");
+        Objects.requireNonNull(subscription, "subscription is null");
         return new SubscriptionDisposable(subscription);
     }
 
diff --git a/src/main/java/io/reactivex/rxjava3/disposables/ReferenceDisposable.java b/src/main/java/io/reactivex/rxjava3/disposables/ReferenceDisposable.java
index e5032d694b..eea584ab0b 100644
--- a/src/main/java/io/reactivex/rxjava3/disposables/ReferenceDisposable.java
+++ b/src/main/java/io/reactivex/rxjava3/disposables/ReferenceDisposable.java
@@ -13,10 +13,10 @@
 
 package io.reactivex.rxjava3.disposables;
 
+import java.util.Objects;
 import java.util.concurrent.atomic.AtomicReference;
 
 import io.reactivex.rxjava3.annotations.NonNull;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 
 /**
  * Base class for Disposable containers that manage some other type that
@@ -29,7 +29,7 @@ abstract class ReferenceDisposable<T> extends AtomicReference<T> implements Disp
     private static final long serialVersionUID = 6537757548749041217L;
 
     ReferenceDisposable(T value) {
-        super(ObjectHelper.requireNonNull(value, "value is null"));
+        super(Objects.requireNonNull(value, "value is null"));
     }
 
     protected abstract void onDisposed(@NonNull T value);
diff --git a/src/main/java/io/reactivex/rxjava3/flowables/ConnectableFlowable.java b/src/main/java/io/reactivex/rxjava3/flowables/ConnectableFlowable.java
index 8b09993ac2..6916d219bf 100644
--- a/src/main/java/io/reactivex/rxjava3/flowables/ConnectableFlowable.java
+++ b/src/main/java/io/reactivex/rxjava3/flowables/ConnectableFlowable.java
@@ -13,6 +13,7 @@
 
 package io.reactivex.rxjava3.flowables;
 
+import java.util.Objects;
 import java.util.concurrent.TimeUnit;
 
 import org.reactivestreams.Subscriber;
@@ -235,8 +236,8 @@ public final Flowable<T> refCount(int subscriberCount, long timeout, TimeUnit un
     @BackpressureSupport(BackpressureKind.PASS_THROUGH)
     public final Flowable<T> refCount(int subscriberCount, long timeout, TimeUnit unit, Scheduler scheduler) {
         ObjectHelper.verifyPositive(subscriberCount, "subscriberCount");
-        ObjectHelper.requireNonNull(unit, "unit is null");
-        ObjectHelper.requireNonNull(scheduler, "scheduler is null");
+        Objects.requireNonNull(unit, "unit is null");
+        Objects.requireNonNull(scheduler, "scheduler is null");
         return RxJavaPlugins.onAssembly(new FlowableRefCount<T>(this, subscriberCount, timeout, unit, scheduler));
     }
 
diff --git a/src/main/java/io/reactivex/rxjava3/internal/disposables/DisposableHelper.java b/src/main/java/io/reactivex/rxjava3/internal/disposables/DisposableHelper.java
index 3a8c5d7029..1f2d2122d1 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/disposables/DisposableHelper.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/disposables/DisposableHelper.java
@@ -13,11 +13,11 @@
 
 package io.reactivex.rxjava3.internal.disposables;
 
+import java.util.Objects;
 import java.util.concurrent.atomic.AtomicReference;
 
 import io.reactivex.rxjava3.disposables.Disposable;
 import io.reactivex.rxjava3.exceptions.ProtocolViolationException;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.plugins.RxJavaPlugins;
 
 /**
@@ -75,7 +75,7 @@ public static boolean set(AtomicReference<Disposable> field, Disposable d) {
      * @return true if the operation succeeded, false
      */
     public static boolean setOnce(AtomicReference<Disposable> field, Disposable d) {
-        ObjectHelper.requireNonNull(d, "d is null");
+        Objects.requireNonNull(d, "d is null");
         if (!field.compareAndSet(null, d)) {
             d.dispose();
             if (field.get() != DISPOSED) {
diff --git a/src/main/java/io/reactivex/rxjava3/internal/disposables/ListCompositeDisposable.java b/src/main/java/io/reactivex/rxjava3/internal/disposables/ListCompositeDisposable.java
index f3afcbf2c0..90928b64c6 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/disposables/ListCompositeDisposable.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/disposables/ListCompositeDisposable.java
@@ -16,7 +16,6 @@
 
 import io.reactivex.rxjava3.disposables.*;
 import io.reactivex.rxjava3.exceptions.*;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.internal.util.ExceptionHelper;
 
 /**
@@ -32,19 +31,19 @@ public ListCompositeDisposable() {
     }
 
     public ListCompositeDisposable(Disposable... resources) {
-        ObjectHelper.requireNonNull(resources, "resources is null");
+        Objects.requireNonNull(resources, "resources is null");
         this.resources = new LinkedList<Disposable>();
         for (Disposable d : resources) {
-            ObjectHelper.requireNonNull(d, "Disposable item is null");
+            Objects.requireNonNull(d, "Disposable item is null");
             this.resources.add(d);
         }
     }
 
     public ListCompositeDisposable(Iterable<? extends Disposable> resources) {
-        ObjectHelper.requireNonNull(resources, "resources is null");
+        Objects.requireNonNull(resources, "resources is null");
         this.resources = new LinkedList<Disposable>();
         for (Disposable d : resources) {
-            ObjectHelper.requireNonNull(d, "Disposable item is null");
+            Objects.requireNonNull(d, "Disposable item is null");
             this.resources.add(d);
         }
     }
@@ -74,7 +73,7 @@ public boolean isDisposed() {
 
     @Override
     public boolean add(Disposable d) {
-        ObjectHelper.requireNonNull(d, "d is null");
+        Objects.requireNonNull(d, "d is null");
         if (!disposed) {
             synchronized (this) {
                 if (!disposed) {
@@ -93,7 +92,7 @@ public boolean add(Disposable d) {
     }
 
     public boolean addAll(Disposable... ds) {
-        ObjectHelper.requireNonNull(ds, "ds is null");
+        Objects.requireNonNull(ds, "ds is null");
         if (!disposed) {
             synchronized (this) {
                 if (!disposed) {
@@ -103,7 +102,7 @@ public boolean addAll(Disposable... ds) {
                         resources = set;
                     }
                     for (Disposable d : ds) {
-                        ObjectHelper.requireNonNull(d, "d is null");
+                        Objects.requireNonNull(d, "d is null");
                         set.add(d);
                     }
                     return true;
@@ -127,7 +126,7 @@ public boolean remove(Disposable d) {
 
     @Override
     public boolean delete(Disposable d) {
-        ObjectHelper.requireNonNull(d, "Disposable item is null");
+        Objects.requireNonNull(d, "Disposable item is null");
         if (disposed) {
             return false;
         }
diff --git a/src/main/java/io/reactivex/rxjava3/internal/functions/Functions.java b/src/main/java/io/reactivex/rxjava3/internal/functions/Functions.java
index 2e44b86d04..2dcbbdea50 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/functions/Functions.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/functions/Functions.java
@@ -34,46 +34,46 @@ private Functions() {
     }
 
     public static <T1, T2, R> Function<Object[], R> toFunction(final BiFunction<? super T1, ? super T2, ? extends R> f) {
-        ObjectHelper.requireNonNull(f, "f is null");
+        Objects.requireNonNull(f, "f is null");
         return new Array2Func<T1, T2, R>(f);
     }
 
     public static <T1, T2, T3, R> Function<Object[], R> toFunction(final Function3<T1, T2, T3, R> f) {
-        ObjectHelper.requireNonNull(f, "f is null");
+        Objects.requireNonNull(f, "f is null");
         return new Array3Func<T1, T2, T3, R>(f);
     }
 
     public static <T1, T2, T3, T4, R> Function<Object[], R> toFunction(final Function4<T1, T2, T3, T4, R> f) {
-        ObjectHelper.requireNonNull(f, "f is null");
+        Objects.requireNonNull(f, "f is null");
         return new Array4Func<T1, T2, T3, T4, R>(f);
     }
 
     public static <T1, T2, T3, T4, T5, R> Function<Object[], R> toFunction(final Function5<T1, T2, T3, T4, T5, R> f) {
-        ObjectHelper.requireNonNull(f, "f is null");
+        Objects.requireNonNull(f, "f is null");
         return new Array5Func<T1, T2, T3, T4, T5, R>(f);
     }
 
     public static <T1, T2, T3, T4, T5, T6, R> Function<Object[], R> toFunction(
             final Function6<T1, T2, T3, T4, T5, T6, R> f) {
-        ObjectHelper.requireNonNull(f, "f is null");
+        Objects.requireNonNull(f, "f is null");
         return new Array6Func<T1, T2, T3, T4, T5, T6, R>(f);
     }
 
     public static <T1, T2, T3, T4, T5, T6, T7, R> Function<Object[], R> toFunction(
             final Function7<T1, T2, T3, T4, T5, T6, T7, R> f) {
-        ObjectHelper.requireNonNull(f, "f is null");
+        Objects.requireNonNull(f, "f is null");
         return new Array7Func<T1, T2, T3, T4, T5, T6, T7, R>(f);
     }
 
     public static <T1, T2, T3, T4, T5, T6, T7, T8, R> Function<Object[], R> toFunction(
             final Function8<T1, T2, T3, T4, T5, T6, T7, T8, R> f) {
-        ObjectHelper.requireNonNull(f, "f is null");
+        Objects.requireNonNull(f, "f is null");
         return new Array8Func<T1, T2, T3, T4, T5, T6, T7, T8, R>(f);
     }
 
     public static <T1, T2, T3, T4, T5, T6, T7, T8, T9, R> Function<Object[], R> toFunction(
             final Function9<T1, T2, T3, T4, T5, T6, T7, T8, T9, R> f) {
-        ObjectHelper.requireNonNull(f, "f is null");
+        Objects.requireNonNull(f, "f is null");
         return new Array9Func<T1, T2, T3, T4, T5, T6, T7, T8, T9, R>(f);
     }
 
diff --git a/src/main/java/io/reactivex/rxjava3/internal/functions/ObjectHelper.java b/src/main/java/io/reactivex/rxjava3/internal/functions/ObjectHelper.java
index 65f5a70c82..05bceafa1d 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/functions/ObjectHelper.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/functions/ObjectHelper.java
@@ -26,22 +26,6 @@ private ObjectHelper() {
         throw new IllegalStateException("No instances!");
     }
 
-    /**
-     * Verifies if the object is not null and returns it or throws a NullPointerException
-     * with the given message.
-     * @param <T> the value type
-     * @param object the object to verify
-     * @param message the message to use with the NullPointerException
-     * @return the object itself
-     * @throws NullPointerException if object is null
-     */
-    public static <T> T requireNonNull(T object, String message) {
-        if (object == null) {
-            throw new NullPointerException(message);
-        }
-        return object;
-    }
-
     static final BiPredicate<Object, Object> EQUALS = new BiObjectPredicate();
 
     /**
diff --git a/src/main/java/io/reactivex/rxjava3/internal/jdk8/FlowableFromStream.java b/src/main/java/io/reactivex/rxjava3/internal/jdk8/FlowableFromStream.java
index db34238b7a..0f4e4b16ba 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/jdk8/FlowableFromStream.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/jdk8/FlowableFromStream.java
@@ -13,6 +13,7 @@
 package io.reactivex.rxjava3.internal.jdk8;
 
 import java.util.Iterator;
+import java.util.Objects;
 import java.util.concurrent.atomic.AtomicLong;
 import java.util.stream.Stream;
 
@@ -21,7 +22,6 @@
 import io.reactivex.rxjava3.annotations.*;
 import io.reactivex.rxjava3.core.Flowable;
 import io.reactivex.rxjava3.exceptions.Exceptions;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.internal.fuseable.*;
 import io.reactivex.rxjava3.internal.subscriptions.*;
 import io.reactivex.rxjava3.internal.util.BackpressureHelper;
@@ -140,7 +140,7 @@ public T poll() {
                     return null;
                 }
             }
-            return ObjectHelper.requireNonNull(iterator.next(), "Iterator.next() returned a null value");
+            return Objects.requireNonNull(iterator.next(), "Iterator.next() returned a null value");
         }
 
         @Override
@@ -184,7 +184,7 @@ public void run(long n) {
                 } else {
                     T next;
                     try {
-                        next = ObjectHelper.requireNonNull(iterator.next(), "The Stream's Iterator returned a null value");
+                        next = Objects.requireNonNull(iterator.next(), "The Stream's Iterator returned a null value");
                     } catch (Throwable ex) {
                         Exceptions.throwIfFatal(ex);
                         downstream.onError(ex);
@@ -252,7 +252,7 @@ public void run(long n) {
                 } else {
                     T next;
                     try {
-                        next = ObjectHelper.requireNonNull(iterator.next(), "The Stream's Iterator returned a null value");
+                        next = Objects.requireNonNull(iterator.next(), "The Stream's Iterator returned a null value");
                     } catch (Throwable ex) {
                         Exceptions.throwIfFatal(ex);
                         downstream.onError(ex);
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/completable/CompletableConcatIterable.java b/src/main/java/io/reactivex/rxjava3/internal/operators/completable/CompletableConcatIterable.java
index c36f546c16..ef801a1646 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/completable/CompletableConcatIterable.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/completable/CompletableConcatIterable.java
@@ -14,13 +14,13 @@
 package io.reactivex.rxjava3.internal.operators.completable;
 
 import java.util.Iterator;
+import java.util.Objects;
 import java.util.concurrent.atomic.AtomicInteger;
 
 import io.reactivex.rxjava3.core.*;
 import io.reactivex.rxjava3.disposables.Disposable;
 import io.reactivex.rxjava3.exceptions.Exceptions;
 import io.reactivex.rxjava3.internal.disposables.*;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 
 public final class CompletableConcatIterable extends Completable {
     final Iterable<? extends CompletableSource> sources;
@@ -35,7 +35,7 @@ public void subscribeActual(CompletableObserver observer) {
         Iterator<? extends CompletableSource> it;
 
         try {
-            it = ObjectHelper.requireNonNull(sources.iterator(), "The iterator returned is null");
+            it = Objects.requireNonNull(sources.iterator(), "The iterator returned is null");
         } catch (Throwable e) {
             Exceptions.throwIfFatal(e);
             EmptyDisposable.error(e, observer);
@@ -109,7 +109,7 @@ void next() {
                 CompletableSource c;
 
                 try {
-                    c = ObjectHelper.requireNonNull(a.next(), "The CompletableSource returned is null");
+                    c = Objects.requireNonNull(a.next(), "The CompletableSource returned is null");
                 } catch (Throwable ex) {
                     Exceptions.throwIfFatal(ex);
                     downstream.onError(ex);
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/completable/CompletableDefer.java b/src/main/java/io/reactivex/rxjava3/internal/operators/completable/CompletableDefer.java
index 0e28d0d28f..c451413f49 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/completable/CompletableDefer.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/completable/CompletableDefer.java
@@ -17,7 +17,8 @@
 import io.reactivex.rxjava3.exceptions.Exceptions;
 import io.reactivex.rxjava3.functions.Supplier;
 import io.reactivex.rxjava3.internal.disposables.EmptyDisposable;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
+
+import java.util.Objects;
 
 public final class CompletableDefer extends Completable {
 
@@ -32,7 +33,7 @@ protected void subscribeActual(CompletableObserver observer) {
         CompletableSource c;
 
         try {
-            c = ObjectHelper.requireNonNull(completableSupplier.get(), "The completableSupplier returned a null CompletableSource");
+            c = Objects.requireNonNull(completableSupplier.get(), "The completableSupplier returned a null CompletableSource");
         } catch (Throwable e) {
             Exceptions.throwIfFatal(e);
             EmptyDisposable.error(e, observer);
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/completable/CompletableErrorSupplier.java b/src/main/java/io/reactivex/rxjava3/internal/operators/completable/CompletableErrorSupplier.java
index 12b39277db..bd4250c447 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/completable/CompletableErrorSupplier.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/completable/CompletableErrorSupplier.java
@@ -17,7 +17,8 @@
 import io.reactivex.rxjava3.exceptions.Exceptions;
 import io.reactivex.rxjava3.functions.Supplier;
 import io.reactivex.rxjava3.internal.disposables.EmptyDisposable;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
+
+import java.util.Objects;
 
 public final class CompletableErrorSupplier extends Completable {
 
@@ -32,7 +33,7 @@ protected void subscribeActual(CompletableObserver observer) {
         Throwable error;
 
         try {
-            error = ObjectHelper.requireNonNull(errorSupplier.get(), "The error returned is null");
+            error = Objects.requireNonNull(errorSupplier.get(), "The error returned is null");
         } catch (Throwable e) {
             Exceptions.throwIfFatal(e);
             error = e;
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/completable/CompletableMergeDelayErrorIterable.java b/src/main/java/io/reactivex/rxjava3/internal/operators/completable/CompletableMergeDelayErrorIterable.java
index 6d420cf044..55efbd8915 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/completable/CompletableMergeDelayErrorIterable.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/completable/CompletableMergeDelayErrorIterable.java
@@ -14,12 +14,12 @@
 package io.reactivex.rxjava3.internal.operators.completable;
 
 import java.util.Iterator;
+import java.util.Objects;
 import java.util.concurrent.atomic.AtomicInteger;
 
 import io.reactivex.rxjava3.core.*;
 import io.reactivex.rxjava3.disposables.CompositeDisposable;
 import io.reactivex.rxjava3.exceptions.Exceptions;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.internal.operators.completable.CompletableMergeDelayErrorArray.*;
 import io.reactivex.rxjava3.internal.util.AtomicThrowable;
 
@@ -40,7 +40,7 @@ public void subscribeActual(final CompletableObserver observer) {
         Iterator<? extends CompletableSource> iterator;
 
         try {
-            iterator = ObjectHelper.requireNonNull(sources.iterator(), "The source iterator returned is null");
+            iterator = Objects.requireNonNull(sources.iterator(), "The source iterator returned is null");
         } catch (Throwable e) {
             Exceptions.throwIfFatal(e);
             observer.onError(e);
@@ -77,7 +77,7 @@ public void subscribeActual(final CompletableObserver observer) {
             CompletableSource c;
 
             try {
-                c = ObjectHelper.requireNonNull(iterator.next(), "The iterator returned a null CompletableSource");
+                c = Objects.requireNonNull(iterator.next(), "The iterator returned a null CompletableSource");
             } catch (Throwable e) {
                 Exceptions.throwIfFatal(e);
                 errors.tryAddThrowableOrReport(e);
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/completable/CompletableMergeIterable.java b/src/main/java/io/reactivex/rxjava3/internal/operators/completable/CompletableMergeIterable.java
index 86c08d359c..b0e5b87bf7 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/completable/CompletableMergeIterable.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/completable/CompletableMergeIterable.java
@@ -14,12 +14,12 @@
 package io.reactivex.rxjava3.internal.operators.completable;
 
 import java.util.Iterator;
+import java.util.Objects;
 import java.util.concurrent.atomic.*;
 
 import io.reactivex.rxjava3.core.*;
 import io.reactivex.rxjava3.disposables.*;
 import io.reactivex.rxjava3.exceptions.Exceptions;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.plugins.RxJavaPlugins;
 
 public final class CompletableMergeIterable extends Completable {
@@ -41,7 +41,7 @@ public void subscribeActual(final CompletableObserver observer) {
         Iterator<? extends CompletableSource> iterator;
 
         try {
-            iterator = ObjectHelper.requireNonNull(sources.iterator(), "The source iterator returned is null");
+            iterator = Objects.requireNonNull(sources.iterator(), "The source iterator returned is null");
         } catch (Throwable e) {
             Exceptions.throwIfFatal(e);
             observer.onError(e);
@@ -74,7 +74,7 @@ public void subscribeActual(final CompletableObserver observer) {
             CompletableSource c;
 
             try {
-                c = ObjectHelper.requireNonNull(iterator.next(), "The iterator returned a null CompletableSource");
+                c = Objects.requireNonNull(iterator.next(), "The iterator returned a null CompletableSource");
             } catch (Throwable e) {
                 Exceptions.throwIfFatal(e);
                 set.dispose();
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/completable/CompletableResumeNext.java b/src/main/java/io/reactivex/rxjava3/internal/operators/completable/CompletableResumeNext.java
index 63227fb391..1d3bd7a3a0 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/completable/CompletableResumeNext.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/completable/CompletableResumeNext.java
@@ -13,6 +13,7 @@
 
 package io.reactivex.rxjava3.internal.operators.completable;
 
+import java.util.Objects;
 import java.util.concurrent.atomic.AtomicReference;
 
 import io.reactivex.rxjava3.core.*;
@@ -20,7 +21,6 @@
 import io.reactivex.rxjava3.exceptions.*;
 import io.reactivex.rxjava3.functions.Function;
 import io.reactivex.rxjava3.internal.disposables.DisposableHelper;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 
 public final class CompletableResumeNext extends Completable {
 
@@ -79,7 +79,7 @@ public void onError(Throwable e) {
             CompletableSource c;
 
             try {
-                c = ObjectHelper.requireNonNull(errorMapper.apply(e), "The errorMapper returned a null CompletableSource");
+                c = Objects.requireNonNull(errorMapper.apply(e), "The errorMapper returned a null CompletableSource");
             } catch (Throwable ex) {
                 Exceptions.throwIfFatal(ex);
                 downstream.onError(new CompositeException(e, ex));
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/completable/CompletableUsing.java b/src/main/java/io/reactivex/rxjava3/internal/operators/completable/CompletableUsing.java
index ab29ce4ae8..7a4e99b332 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/completable/CompletableUsing.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/completable/CompletableUsing.java
@@ -13,6 +13,7 @@
 
 package io.reactivex.rxjava3.internal.operators.completable;
 
+import java.util.Objects;
 import java.util.concurrent.atomic.AtomicReference;
 
 import io.reactivex.rxjava3.core.*;
@@ -20,7 +21,6 @@
 import io.reactivex.rxjava3.exceptions.*;
 import io.reactivex.rxjava3.functions.*;
 import io.reactivex.rxjava3.internal.disposables.*;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.plugins.RxJavaPlugins;
 
 public final class CompletableUsing<R> extends Completable {
@@ -54,7 +54,7 @@ protected void subscribeActual(CompletableObserver observer) {
         CompletableSource source;
 
         try {
-            source = ObjectHelper.requireNonNull(completableFunction.apply(resource), "The completableFunction returned a null CompletableSource");
+            source = Objects.requireNonNull(completableFunction.apply(resource), "The completableFunction returned a null CompletableSource");
         } catch (Throwable ex) {
             Exceptions.throwIfFatal(ex);
             if (eager) {
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/AbstractFlowableWithUpstream.java b/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/AbstractFlowableWithUpstream.java
index 76a68d37b3..d83f65c347 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/AbstractFlowableWithUpstream.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/AbstractFlowableWithUpstream.java
@@ -16,9 +16,10 @@
 import org.reactivestreams.Publisher;
 
 import io.reactivex.rxjava3.core.Flowable;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.internal.fuseable.HasUpstreamPublisher;
 
+import java.util.Objects;
+
 /**
  * Abstract base class for operators that take an upstream
  * source {@link Publisher}.
@@ -39,7 +40,7 @@ abstract class AbstractFlowableWithUpstream<T, R> extends Flowable<R> implements
      * @param source the source (upstream) Publisher instance, not null (verified)
      */
     AbstractFlowableWithUpstream(Flowable<T> source) {
-        this.source = ObjectHelper.requireNonNull(source, "source is null");
+        this.source = Objects.requireNonNull(source, "source is null");
     }
 
     @Override
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableBlockingSubscribe.java b/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableBlockingSubscribe.java
index 899ae6c21c..14654d35ee 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableBlockingSubscribe.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableBlockingSubscribe.java
@@ -13,6 +13,7 @@
 
 package io.reactivex.rxjava3.internal.operators.flowable;
 
+import java.util.Objects;
 import java.util.concurrent.*;
 
 import org.reactivestreams.*;
@@ -103,9 +104,9 @@ public static <T> void subscribe(Publisher<? extends T> o) {
      */
     public static <T> void subscribe(Publisher<? extends T> o, final Consumer<? super T> onNext,
             final Consumer<? super Throwable> onError, final Action onComplete) {
-        ObjectHelper.requireNonNull(onNext, "onNext is null");
-        ObjectHelper.requireNonNull(onError, "onError is null");
-        ObjectHelper.requireNonNull(onComplete, "onComplete is null");
+        Objects.requireNonNull(onNext, "onNext is null");
+        Objects.requireNonNull(onError, "onError is null");
+        Objects.requireNonNull(onComplete, "onComplete is null");
         subscribe(o, new LambdaSubscriber<T>(onNext, onError, onComplete, Functions.REQUEST_MAX));
     }
 
@@ -120,9 +121,9 @@ public static <T> void subscribe(Publisher<? extends T> o, final Consumer<? supe
      */
     public static <T> void subscribe(Publisher<? extends T> o, final Consumer<? super T> onNext,
         final Consumer<? super Throwable> onError, final Action onComplete, int bufferSize) {
-        ObjectHelper.requireNonNull(onNext, "onNext is null");
-        ObjectHelper.requireNonNull(onError, "onError is null");
-        ObjectHelper.requireNonNull(onComplete, "onComplete is null");
+        Objects.requireNonNull(onNext, "onNext is null");
+        Objects.requireNonNull(onError, "onError is null");
+        Objects.requireNonNull(onComplete, "onComplete is null");
         ObjectHelper.verifyPositive(bufferSize, "number > 0 required");
         subscribe(o, new BoundedSubscriber<T>(onNext, onError, onComplete, Functions.boundedConsumer(bufferSize),
                 bufferSize));
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableBuffer.java b/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableBuffer.java
index 0da3aea64e..08f89e99e2 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableBuffer.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableBuffer.java
@@ -21,7 +21,6 @@
 import io.reactivex.rxjava3.core.*;
 import io.reactivex.rxjava3.exceptions.Exceptions;
 import io.reactivex.rxjava3.functions.*;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.internal.subscriptions.SubscriptionHelper;
 import io.reactivex.rxjava3.internal.util.*;
 import io.reactivex.rxjava3.plugins.RxJavaPlugins;
@@ -105,7 +104,7 @@ public void onNext(T t) {
             if (b == null) {
 
                 try {
-                    b = ObjectHelper.requireNonNull(bufferSupplier.get(), "The bufferSupplier returned a null buffer");
+                    b = Objects.requireNonNull(bufferSupplier.get(), "The bufferSupplier returned a null buffer");
                 } catch (Throwable e) {
                     Exceptions.throwIfFatal(e);
                     cancel();
@@ -227,7 +226,7 @@ public void onNext(T t) {
 
             if (i++ == 0) {
                 try {
-                    b = ObjectHelper.requireNonNull(bufferSupplier.get(), "The bufferSupplier returned a null buffer");
+                    b = Objects.requireNonNull(bufferSupplier.get(), "The bufferSupplier returned a null buffer");
                 } catch (Throwable e) {
                     Exceptions.throwIfFatal(e);
                     cancel();
@@ -378,7 +377,7 @@ public void onNext(T t) {
                 C b;
 
                 try {
-                    b = ObjectHelper.requireNonNull(bufferSupplier.get(), "The bufferSupplier returned a null buffer");
+                    b = Objects.requireNonNull(bufferSupplier.get(), "The bufferSupplier returned a null buffer");
                 } catch (Throwable e) {
                     Exceptions.throwIfFatal(e);
                     cancel();
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableBufferBoundary.java b/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableBufferBoundary.java
index 4e8103e1a6..47f6e6bf06 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableBufferBoundary.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableBufferBoundary.java
@@ -22,7 +22,6 @@
 import io.reactivex.rxjava3.disposables.*;
 import io.reactivex.rxjava3.exceptions.Exceptions;
 import io.reactivex.rxjava3.functions.*;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.internal.queue.SpscLinkedArrayQueue;
 import io.reactivex.rxjava3.internal.subscriptions.SubscriptionHelper;
 import io.reactivex.rxjava3.internal.util.*;
@@ -181,8 +180,8 @@ void open(Open token) {
             Publisher<? extends Close> p;
             C buf;
             try {
-                buf = ObjectHelper.requireNonNull(bufferSupplier.get(), "The bufferSupplier returned a null Collection");
-                p = ObjectHelper.requireNonNull(bufferClose.apply(token), "The bufferClose returned a null Publisher");
+                buf = Objects.requireNonNull(bufferSupplier.get(), "The bufferSupplier returned a null Collection");
+                p = Objects.requireNonNull(bufferClose.apply(token), "The bufferClose returned a null Publisher");
             } catch (Throwable ex) {
                 Exceptions.throwIfFatal(ex);
                 SubscriptionHelper.cancel(upstream);
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableBufferExactBoundary.java b/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableBufferExactBoundary.java
index 22d139eb89..a1ca188b13 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableBufferExactBoundary.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableBufferExactBoundary.java
@@ -14,6 +14,7 @@
 package io.reactivex.rxjava3.internal.operators.flowable;
 
 import java.util.Collection;
+import java.util.Objects;
 
 import org.reactivestreams.*;
 
@@ -21,7 +22,6 @@
 import io.reactivex.rxjava3.disposables.Disposable;
 import io.reactivex.rxjava3.exceptions.Exceptions;
 import io.reactivex.rxjava3.functions.Supplier;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.internal.queue.MpscLinkedQueue;
 import io.reactivex.rxjava3.internal.subscribers.QueueDrainSubscriber;
 import io.reactivex.rxjava3.internal.subscriptions.*;
@@ -73,7 +73,7 @@ public void onSubscribe(Subscription s) {
             U b;
 
             try {
-                b = ObjectHelper.requireNonNull(bufferSupplier.get(), "The buffer supplied is null");
+                b = Objects.requireNonNull(bufferSupplier.get(), "The buffer supplied is null");
             } catch (Throwable e) {
                 Exceptions.throwIfFatal(e);
                 cancelled = true;
@@ -153,7 +153,7 @@ void next() {
             U next;
 
             try {
-                next = ObjectHelper.requireNonNull(bufferSupplier.get(), "The buffer supplied is null");
+                next = Objects.requireNonNull(bufferSupplier.get(), "The buffer supplied is null");
             } catch (Throwable e) {
                 Exceptions.throwIfFatal(e);
                 cancel();
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableBufferTimed.java b/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableBufferTimed.java
index 4057a06abb..0b3faed1c5 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableBufferTimed.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableBufferTimed.java
@@ -25,7 +25,6 @@
 import io.reactivex.rxjava3.exceptions.Exceptions;
 import io.reactivex.rxjava3.functions.Supplier;
 import io.reactivex.rxjava3.internal.disposables.DisposableHelper;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.internal.queue.MpscLinkedQueue;
 import io.reactivex.rxjava3.internal.subscribers.QueueDrainSubscriber;
 import io.reactivex.rxjava3.internal.subscriptions.*;
@@ -110,7 +109,7 @@ public void onSubscribe(Subscription s) {
                 U b;
 
                 try {
-                    b = ObjectHelper.requireNonNull(bufferSupplier.get(), "The supplied buffer is null");
+                    b = Objects.requireNonNull(bufferSupplier.get(), "The supplied buffer is null");
                 } catch (Throwable e) {
                     Exceptions.throwIfFatal(e);
                     cancel();
@@ -187,7 +186,7 @@ public void run() {
             U next;
 
             try {
-                next = ObjectHelper.requireNonNull(bufferSupplier.get(), "The supplied buffer is null");
+                next = Objects.requireNonNull(bufferSupplier.get(), "The supplied buffer is null");
             } catch (Throwable e) {
                 Exceptions.throwIfFatal(e);
                 cancel();
@@ -258,7 +257,7 @@ public void onSubscribe(Subscription s) {
             final U b; // NOPMD
 
             try {
-                b = ObjectHelper.requireNonNull(bufferSupplier.get(), "The supplied buffer is null");
+                b = Objects.requireNonNull(bufferSupplier.get(), "The supplied buffer is null");
             } catch (Throwable e) {
                 Exceptions.throwIfFatal(e);
                 w.dispose();
@@ -339,7 +338,7 @@ public void run() {
             final U b; // NOPMD
 
             try {
-                b = ObjectHelper.requireNonNull(bufferSupplier.get(), "The supplied buffer is null");
+                b = Objects.requireNonNull(bufferSupplier.get(), "The supplied buffer is null");
             } catch (Throwable e) {
                 Exceptions.throwIfFatal(e);
                 cancel();
@@ -424,7 +423,7 @@ public void onSubscribe(Subscription s) {
             U b;
 
             try {
-                b = ObjectHelper.requireNonNull(bufferSupplier.get(), "The supplied buffer is null");
+                b = Objects.requireNonNull(bufferSupplier.get(), "The supplied buffer is null");
             } catch (Throwable e) {
                 Exceptions.throwIfFatal(e);
                 w.dispose();
@@ -468,7 +467,7 @@ public void onNext(T t) {
             fastPathOrderedEmitMax(b, false, this);
 
             try {
-                b = ObjectHelper.requireNonNull(bufferSupplier.get(), "The supplied buffer is null");
+                b = Objects.requireNonNull(bufferSupplier.get(), "The supplied buffer is null");
             } catch (Throwable e) {
                 Exceptions.throwIfFatal(e);
                 cancel();
@@ -550,7 +549,7 @@ public void run() {
             U next;
 
             try {
-                next = ObjectHelper.requireNonNull(bufferSupplier.get(), "The supplied buffer is null");
+                next = Objects.requireNonNull(bufferSupplier.get(), "The supplied buffer is null");
             } catch (Throwable e) {
                 Exceptions.throwIfFatal(e);
                 cancel();
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableCollect.java b/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableCollect.java
index d5b4dd8233..80345f2f3b 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableCollect.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableCollect.java
@@ -17,10 +17,11 @@
 import io.reactivex.rxjava3.core.*;
 import io.reactivex.rxjava3.exceptions.Exceptions;
 import io.reactivex.rxjava3.functions.*;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.internal.subscriptions.*;
 import io.reactivex.rxjava3.plugins.RxJavaPlugins;
 
+import java.util.Objects;
+
 public final class FlowableCollect<T, U> extends AbstractFlowableWithUpstream<T, U> {
 
     final Supplier<? extends U> initialSupplier;
@@ -36,7 +37,7 @@ public FlowableCollect(Flowable<T> source, Supplier<? extends U> initialSupplier
     protected void subscribeActual(Subscriber<? super U> s) {
         U u;
         try {
-            u = ObjectHelper.requireNonNull(initialSupplier.get(), "The initial value supplied is null");
+            u = Objects.requireNonNull(initialSupplier.get(), "The initial value supplied is null");
         } catch (Throwable e) {
             EmptySubscription.error(e, s);
             return;
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableCollectSingle.java b/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableCollectSingle.java
index b48f4d11fc..fcb5590b49 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableCollectSingle.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableCollectSingle.java
@@ -19,11 +19,12 @@
 import io.reactivex.rxjava3.exceptions.Exceptions;
 import io.reactivex.rxjava3.functions.*;
 import io.reactivex.rxjava3.internal.disposables.EmptyDisposable;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.internal.fuseable.FuseToFlowable;
 import io.reactivex.rxjava3.internal.subscriptions.SubscriptionHelper;
 import io.reactivex.rxjava3.plugins.RxJavaPlugins;
 
+import java.util.Objects;
+
 public final class FlowableCollectSingle<T, U> extends Single<U> implements FuseToFlowable<U> {
 
     final Flowable<T> source;
@@ -41,7 +42,7 @@ public FlowableCollectSingle(Flowable<T> source, Supplier<? extends U> initialSu
     protected void subscribeActual(SingleObserver<? super U> observer) {
         U u;
         try {
-            u = ObjectHelper.requireNonNull(initialSupplier.get(), "The initialSupplier returned a null value");
+            u = Objects.requireNonNull(initialSupplier.get(), "The initialSupplier returned a null value");
         } catch (Throwable e) {
             EmptyDisposable.error(e, observer);
             return;
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableCombineLatest.java b/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableCombineLatest.java
index 70f7f313bc..24306072bc 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableCombineLatest.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableCombineLatest.java
@@ -14,6 +14,7 @@
 package io.reactivex.rxjava3.internal.operators.flowable;
 
 import java.util.Iterator;
+import java.util.Objects;
 import java.util.concurrent.atomic.*;
 
 import org.reactivestreams.*;
@@ -22,7 +23,6 @@
 import io.reactivex.rxjava3.core.*;
 import io.reactivex.rxjava3.exceptions.Exceptions;
 import io.reactivex.rxjava3.functions.Function;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.internal.operators.flowable.FlowableMap.MapSubscriber;
 import io.reactivex.rxjava3.internal.queue.SpscLinkedArrayQueue;
 import io.reactivex.rxjava3.internal.subscriptions.*;
@@ -82,7 +82,7 @@ public void subscribeActual(Subscriber<? super R> s) {
             Iterator<? extends Publisher<? extends T>> it;
 
             try {
-                it = ObjectHelper.requireNonNull(iterable.iterator(), "The iterator returned is null");
+                it = Objects.requireNonNull(iterable.iterator(), "The iterator returned is null");
             } catch (Throwable e) {
                 Exceptions.throwIfFatal(e);
                 EmptySubscription.error(e, s);
@@ -108,7 +108,7 @@ public void subscribeActual(Subscriber<? super R> s) {
                 Publisher<? extends T> p;
 
                 try {
-                    p = ObjectHelper.requireNonNull(it.next(), "The publisher returned by the iterator is null");
+                    p = Objects.requireNonNull(it.next(), "The publisher returned by the iterator is null");
                 } catch (Throwable e) {
                     Exceptions.throwIfFatal(e);
                     EmptySubscription.error(e, s);
@@ -359,7 +359,7 @@ void drainAsync() {
                     R w;
 
                     try {
-                        w = ObjectHelper.requireNonNull(combiner.apply(va), "The combiner returned a null value");
+                        w = Objects.requireNonNull(combiner.apply(va), "The combiner returned a null value");
                     } catch (Throwable ex) {
                         Exceptions.throwIfFatal(ex);
 
@@ -472,7 +472,7 @@ public R poll() throws Throwable {
                 return null;
             }
             T[] a = (T[])queue.poll();
-            R r = ObjectHelper.requireNonNull(combiner.apply(a), "The combiner returned a null value");
+            R r = Objects.requireNonNull(combiner.apply(a), "The combiner returned a null value");
             ((CombineLatestInnerSubscriber<T>)e).requestOne();
             return r;
         }
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableConcatMap.java b/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableConcatMap.java
index a11f206dde..f757fb5f3b 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableConcatMap.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableConcatMap.java
@@ -12,6 +12,7 @@
  */
 package io.reactivex.rxjava3.internal.operators.flowable;
 
+import java.util.Objects;
 import java.util.concurrent.atomic.AtomicInteger;
 
 import org.reactivestreams.*;
@@ -19,7 +20,6 @@
 import io.reactivex.rxjava3.core.*;
 import io.reactivex.rxjava3.exceptions.Exceptions;
 import io.reactivex.rxjava3.functions.*;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.internal.fuseable.*;
 import io.reactivex.rxjava3.internal.queue.SpscArrayQueue;
 import io.reactivex.rxjava3.internal.subscriptions.*;
@@ -277,7 +277,7 @@ void drain() {
                             Publisher<? extends R> p;
 
                             try {
-                                p = ObjectHelper.requireNonNull(mapper.apply(v), "The mapper returned a null Publisher");
+                                p = Objects.requireNonNull(mapper.apply(v), "The mapper returned a null Publisher");
                             } catch (Throwable e) {
                                 Exceptions.throwIfFatal(e);
 
@@ -479,7 +479,7 @@ void drain() {
                             Publisher<? extends R> p;
 
                             try {
-                                p = ObjectHelper.requireNonNull(mapper.apply(v), "The mapper returned a null Publisher");
+                                p = Objects.requireNonNull(mapper.apply(v), "The mapper returned a null Publisher");
                             } catch (Throwable e) {
                                 Exceptions.throwIfFatal(e);
 
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableConcatMapEager.java b/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableConcatMapEager.java
index 29c2077226..9aee3eaebb 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableConcatMapEager.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableConcatMapEager.java
@@ -13,6 +13,7 @@
 
 package io.reactivex.rxjava3.internal.operators.flowable;
 
+import java.util.Objects;
 import java.util.concurrent.atomic.*;
 
 import org.reactivestreams.*;
@@ -20,7 +21,6 @@
 import io.reactivex.rxjava3.core.*;
 import io.reactivex.rxjava3.exceptions.*;
 import io.reactivex.rxjava3.functions.Function;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.internal.fuseable.SimpleQueue;
 import io.reactivex.rxjava3.internal.queue.SpscLinkedArrayQueue;
 import io.reactivex.rxjava3.internal.subscribers.*;
@@ -115,7 +115,7 @@ public void onNext(T t) {
             Publisher<? extends R> p;
 
             try {
-                p = ObjectHelper.requireNonNull(mapper.apply(t), "The mapper returned a null Publisher");
+                p = Objects.requireNonNull(mapper.apply(t), "The mapper returned a null Publisher");
             } catch (Throwable ex) {
                 Exceptions.throwIfFatal(ex);
                 upstream.cancel();
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableConcatMapScheduler.java b/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableConcatMapScheduler.java
index 828bb5a5fa..05c984b533 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableConcatMapScheduler.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableConcatMapScheduler.java
@@ -12,6 +12,7 @@
  */
 package io.reactivex.rxjava3.internal.operators.flowable;
 
+import java.util.Objects;
 import java.util.concurrent.atomic.AtomicInteger;
 
 import org.reactivestreams.*;
@@ -19,7 +20,6 @@
 import io.reactivex.rxjava3.core.*;
 import io.reactivex.rxjava3.exceptions.Exceptions;
 import io.reactivex.rxjava3.functions.*;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.internal.fuseable.*;
 import io.reactivex.rxjava3.internal.operators.flowable.FlowableConcatMap.*;
 import io.reactivex.rxjava3.internal.queue.SpscArrayQueue;
@@ -287,7 +287,7 @@ public void run() {
                         Publisher<? extends R> p;
 
                         try {
-                            p = ObjectHelper.requireNonNull(mapper.apply(v), "The mapper returned a null Publisher");
+                            p = Objects.requireNonNull(mapper.apply(v), "The mapper returned a null Publisher");
                         } catch (Throwable e) {
                             Exceptions.throwIfFatal(e);
 
@@ -474,7 +474,7 @@ public void run() {
                         Publisher<? extends R> p;
 
                         try {
-                            p = ObjectHelper.requireNonNull(mapper.apply(v), "The mapper returned a null Publisher");
+                            p = Objects.requireNonNull(mapper.apply(v), "The mapper returned a null Publisher");
                         } catch (Throwable e) {
                             Exceptions.throwIfFatal(e);
 
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableDebounce.java b/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableDebounce.java
index 53f3c4e833..ab86164622 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableDebounce.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableDebounce.java
@@ -13,6 +13,7 @@
 
 package io.reactivex.rxjava3.internal.operators.flowable;
 
+import java.util.Objects;
 import java.util.concurrent.atomic.*;
 
 import org.reactivestreams.*;
@@ -22,7 +23,6 @@
 import io.reactivex.rxjava3.exceptions.*;
 import io.reactivex.rxjava3.functions.Function;
 import io.reactivex.rxjava3.internal.disposables.DisposableHelper;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.internal.subscriptions.SubscriptionHelper;
 import io.reactivex.rxjava3.internal.util.BackpressureHelper;
 import io.reactivex.rxjava3.plugins.RxJavaPlugins;
@@ -88,7 +88,7 @@ public void onNext(T t) {
             Publisher<U> p;
 
             try {
-                p = ObjectHelper.requireNonNull(debounceSelector.apply(t), "The publisher supplied is null");
+                p = Objects.requireNonNull(debounceSelector.apply(t), "The publisher supplied is null");
             } catch (Throwable e) {
                 Exceptions.throwIfFatal(e);
                 cancel();
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableDefer.java b/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableDefer.java
index 6117d56f92..6c3d8f9008 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableDefer.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableDefer.java
@@ -18,9 +18,10 @@
 import io.reactivex.rxjava3.core.Flowable;
 import io.reactivex.rxjava3.exceptions.Exceptions;
 import io.reactivex.rxjava3.functions.Supplier;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.internal.subscriptions.EmptySubscription;
 
+import java.util.Objects;
+
 public final class FlowableDefer<T> extends Flowable<T> {
     final Supplier<? extends Publisher<? extends T>> supplier;
     public FlowableDefer(Supplier<? extends Publisher<? extends T>> supplier) {
@@ -31,7 +32,7 @@ public FlowableDefer(Supplier<? extends Publisher<? extends T>> supplier) {
     public void subscribeActual(Subscriber<? super T> s) {
         Publisher<? extends T> pub;
         try {
-            pub = ObjectHelper.requireNonNull(supplier.get(), "The publisher supplied is null");
+            pub = Objects.requireNonNull(supplier.get(), "The publisher supplied is null");
         } catch (Throwable t) {
             Exceptions.throwIfFatal(t);
             EmptySubscription.error(t, s);
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableDematerialize.java b/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableDematerialize.java
index d19bf4f037..d5e46e6d23 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableDematerialize.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableDematerialize.java
@@ -18,10 +18,11 @@
 import io.reactivex.rxjava3.core.*;
 import io.reactivex.rxjava3.exceptions.Exceptions;
 import io.reactivex.rxjava3.functions.Function;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.internal.subscriptions.SubscriptionHelper;
 import io.reactivex.rxjava3.plugins.RxJavaPlugins;
 
+import java.util.Objects;
+
 public final class FlowableDematerialize<T, R> extends AbstractFlowableWithUpstream<T, R> {
 
     final Function<? super T, ? extends Notification<R>> selector;
@@ -74,7 +75,7 @@ public void onNext(T item) {
             Notification<R> notification;
 
             try {
-                notification = ObjectHelper.requireNonNull(selector.apply(item), "The selector returned a null Notification");
+                notification = Objects.requireNonNull(selector.apply(item), "The selector returned a null Notification");
             } catch (Throwable ex) {
                 Exceptions.throwIfFatal(ex);
                 upstream.cancel();
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableDistinct.java b/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableDistinct.java
index 870710bd87..1cd4be2458 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableDistinct.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableDistinct.java
@@ -14,6 +14,7 @@
 package io.reactivex.rxjava3.internal.operators.flowable;
 
 import java.util.Collection;
+import java.util.Objects;
 
 import org.reactivestreams.Subscriber;
 
@@ -21,7 +22,6 @@
 import io.reactivex.rxjava3.core.Flowable;
 import io.reactivex.rxjava3.exceptions.Exceptions;
 import io.reactivex.rxjava3.functions.*;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.internal.fuseable.QueueFuseable;
 import io.reactivex.rxjava3.internal.subscribers.BasicFuseableSubscriber;
 import io.reactivex.rxjava3.internal.subscriptions.EmptySubscription;
@@ -77,7 +77,7 @@ public void onNext(T value) {
                 boolean b;
 
                 try {
-                    key = ObjectHelper.requireNonNull(keySelector.apply(value), "The keySelector returned a null key");
+                    key = Objects.requireNonNull(keySelector.apply(value), "The keySelector returned a null key");
                     b = collection.add(key);
                 } catch (Throwable ex) {
                     fail(ex);
@@ -125,7 +125,7 @@ public T poll() throws Throwable {
             for (;;) {
                 T v = qs.poll();
 
-                if (v == null || collection.add(ObjectHelper.requireNonNull(keySelector.apply(v), "The keySelector returned a null key"))) {
+                if (v == null || collection.add(Objects.requireNonNull(keySelector.apply(v), "The keySelector returned a null key"))) {
                     return v;
                 } else {
                     if (sourceMode == QueueFuseable.ASYNC) {
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableFlatMap.java b/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableFlatMap.java
index de53c5d5b8..1c14ea54af 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableFlatMap.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableFlatMap.java
@@ -13,6 +13,7 @@
 
 package io.reactivex.rxjava3.internal.operators.flowable;
 
+import java.util.Objects;
 import java.util.concurrent.atomic.*;
 
 import org.reactivestreams.*;
@@ -21,7 +22,6 @@
 import io.reactivex.rxjava3.disposables.Disposable;
 import io.reactivex.rxjava3.exceptions.*;
 import io.reactivex.rxjava3.functions.*;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.internal.fuseable.*;
 import io.reactivex.rxjava3.internal.queue.*;
 import io.reactivex.rxjava3.internal.subscriptions.SubscriptionHelper;
@@ -128,7 +128,7 @@ public void onNext(T t) {
             }
             Publisher<? extends U> p;
             try {
-                p = ObjectHelper.requireNonNull(mapper.apply(t), "The mapper returned a null Publisher");
+                p = Objects.requireNonNull(mapper.apply(t), "The mapper returned a null Publisher");
             } catch (Throwable e) {
                 Exceptions.throwIfFatal(e);
                 upstream.cancel();
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableFlatMapCompletable.java b/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableFlatMapCompletable.java
index 5c20e9d75a..5c544add23 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableFlatMapCompletable.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableFlatMapCompletable.java
@@ -13,6 +13,7 @@
 
 package io.reactivex.rxjava3.internal.operators.flowable;
 
+import java.util.Objects;
 import java.util.concurrent.atomic.AtomicReference;
 
 import org.reactivestreams.*;
@@ -23,7 +24,6 @@
 import io.reactivex.rxjava3.exceptions.Exceptions;
 import io.reactivex.rxjava3.functions.Function;
 import io.reactivex.rxjava3.internal.disposables.DisposableHelper;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.internal.subscriptions.*;
 import io.reactivex.rxjava3.internal.util.AtomicThrowable;
 
@@ -106,7 +106,7 @@ public void onNext(T value) {
             CompletableSource cs;
 
             try {
-                cs = ObjectHelper.requireNonNull(mapper.apply(value), "The mapper returned a null CompletableSource");
+                cs = Objects.requireNonNull(mapper.apply(value), "The mapper returned a null CompletableSource");
             } catch (Throwable ex) {
                 Exceptions.throwIfFatal(ex);
                 upstream.cancel();
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableFlatMapCompletableCompletable.java b/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableFlatMapCompletableCompletable.java
index 52a719ca44..94f0fa8653 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableFlatMapCompletableCompletable.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableFlatMapCompletableCompletable.java
@@ -13,6 +13,7 @@
 
 package io.reactivex.rxjava3.internal.operators.flowable;
 
+import java.util.Objects;
 import java.util.concurrent.atomic.*;
 
 import org.reactivestreams.Subscription;
@@ -22,7 +23,6 @@
 import io.reactivex.rxjava3.exceptions.Exceptions;
 import io.reactivex.rxjava3.functions.Function;
 import io.reactivex.rxjava3.internal.disposables.DisposableHelper;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.internal.fuseable.FuseToFlowable;
 import io.reactivex.rxjava3.internal.subscriptions.SubscriptionHelper;
 import io.reactivex.rxjava3.internal.util.AtomicThrowable;
@@ -114,7 +114,7 @@ public void onNext(T value) {
             CompletableSource cs;
 
             try {
-                cs = ObjectHelper.requireNonNull(mapper.apply(value), "The mapper returned a null CompletableSource");
+                cs = Objects.requireNonNull(mapper.apply(value), "The mapper returned a null CompletableSource");
             } catch (Throwable ex) {
                 Exceptions.throwIfFatal(ex);
                 upstream.cancel();
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableFlatMapMaybe.java b/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableFlatMapMaybe.java
index f6cb69c84a..18c2e21f63 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableFlatMapMaybe.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableFlatMapMaybe.java
@@ -13,6 +13,7 @@
 
 package io.reactivex.rxjava3.internal.operators.flowable;
 
+import java.util.Objects;
 import java.util.concurrent.atomic.*;
 
 import org.reactivestreams.*;
@@ -22,7 +23,6 @@
 import io.reactivex.rxjava3.exceptions.Exceptions;
 import io.reactivex.rxjava3.functions.Function;
 import io.reactivex.rxjava3.internal.disposables.DisposableHelper;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.internal.queue.SpscLinkedArrayQueue;
 import io.reactivex.rxjava3.internal.subscriptions.SubscriptionHelper;
 import io.reactivex.rxjava3.internal.util.*;
@@ -115,7 +115,7 @@ public void onNext(T t) {
             MaybeSource<? extends R> ms;
 
             try {
-                ms = ObjectHelper.requireNonNull(mapper.apply(t), "The mapper returned a null MaybeSource");
+                ms = Objects.requireNonNull(mapper.apply(t), "The mapper returned a null MaybeSource");
             } catch (Throwable ex) {
                 Exceptions.throwIfFatal(ex);
                 upstream.cancel();
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableFlatMapSingle.java b/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableFlatMapSingle.java
index b1ba1fed12..366b48be09 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableFlatMapSingle.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableFlatMapSingle.java
@@ -13,6 +13,7 @@
 
 package io.reactivex.rxjava3.internal.operators.flowable;
 
+import java.util.Objects;
 import java.util.concurrent.atomic.*;
 
 import org.reactivestreams.*;
@@ -22,7 +23,6 @@
 import io.reactivex.rxjava3.exceptions.Exceptions;
 import io.reactivex.rxjava3.functions.Function;
 import io.reactivex.rxjava3.internal.disposables.DisposableHelper;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.internal.queue.SpscLinkedArrayQueue;
 import io.reactivex.rxjava3.internal.subscriptions.SubscriptionHelper;
 import io.reactivex.rxjava3.internal.util.*;
@@ -115,7 +115,7 @@ public void onNext(T t) {
             SingleSource<? extends R> ms;
 
             try {
-                ms = ObjectHelper.requireNonNull(mapper.apply(t), "The mapper returned a null SingleSource");
+                ms = Objects.requireNonNull(mapper.apply(t), "The mapper returned a null SingleSource");
             } catch (Throwable ex) {
                 Exceptions.throwIfFatal(ex);
                 upstream.cancel();
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableFlattenIterable.java b/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableFlattenIterable.java
index 808d964798..de7221cb38 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableFlattenIterable.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableFlattenIterable.java
@@ -14,6 +14,7 @@
 package io.reactivex.rxjava3.internal.operators.flowable;
 
 import java.util.Iterator;
+import java.util.Objects;
 import java.util.concurrent.atomic.*;
 
 import org.reactivestreams.*;
@@ -22,7 +23,6 @@
 import io.reactivex.rxjava3.core.*;
 import io.reactivex.rxjava3.exceptions.*;
 import io.reactivex.rxjava3.functions.*;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.internal.fuseable.*;
 import io.reactivex.rxjava3.internal.queue.SpscArrayQueue;
 import io.reactivex.rxjava3.internal.subscriptions.*;
@@ -297,7 +297,7 @@ void drain() {
                         R v;
 
                         try {
-                            v = ObjectHelper.requireNonNull(it.next(), "The iterator returned a null value");
+                            v = Objects.requireNonNull(it.next(), "The iterator returned a null value");
                         } catch (Throwable ex) {
                             Exceptions.throwIfFatal(ex);
                             current = null;
@@ -432,7 +432,7 @@ public R poll() throws Throwable {
                     current = it;
                 }
 
-                R r = ObjectHelper.requireNonNull(it.next(), "The iterator returned a null value");
+                R r = Objects.requireNonNull(it.next(), "The iterator returned a null value");
 
                 if (!it.hasNext()) {
                     current = null;
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableFromArray.java b/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableFromArray.java
index 0b49186290..83371ab447 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableFromArray.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableFromArray.java
@@ -17,11 +17,12 @@
 
 import io.reactivex.rxjava3.annotations.Nullable;
 import io.reactivex.rxjava3.core.Flowable;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.internal.fuseable.ConditionalSubscriber;
 import io.reactivex.rxjava3.internal.subscriptions.*;
 import io.reactivex.rxjava3.internal.util.BackpressureHelper;
 
+import java.util.Objects;
+
 public final class FlowableFromArray<T> extends Flowable<T> {
     final T[] array;
 
@@ -67,7 +68,7 @@ public final T poll() {
             }
 
             index = i + 1;
-            return ObjectHelper.requireNonNull(arr[i], "array element is null");
+            return Objects.requireNonNull(arr[i], "array element is null");
         }
 
         @Override
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableFromCallable.java b/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableFromCallable.java
index 7f918c5c51..80afc65910 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableFromCallable.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableFromCallable.java
@@ -13,6 +13,7 @@
 
 package io.reactivex.rxjava3.internal.operators.flowable;
 
+import java.util.Objects;
 import java.util.concurrent.Callable;
 
 import org.reactivestreams.Subscriber;
@@ -20,7 +21,6 @@
 import io.reactivex.rxjava3.core.Flowable;
 import io.reactivex.rxjava3.exceptions.Exceptions;
 import io.reactivex.rxjava3.functions.Supplier;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.internal.subscriptions.DeferredScalarSubscription;
 import io.reactivex.rxjava3.plugins.RxJavaPlugins;
 
@@ -37,7 +37,7 @@ public void subscribeActual(Subscriber<? super T> s) {
 
         T t;
         try {
-            t = ObjectHelper.requireNonNull(callable.call(), "The callable returned a null value");
+            t = Objects.requireNonNull(callable.call(), "The callable returned a null value");
         } catch (Throwable ex) {
             Exceptions.throwIfFatal(ex);
             if (deferred.isCancelled()) {
@@ -53,6 +53,6 @@ public void subscribeActual(Subscriber<? super T> s) {
 
     @Override
     public T get() throws Throwable {
-        return ObjectHelper.requireNonNull(callable.call(), "The callable returned a null value");
+        return Objects.requireNonNull(callable.call(), "The callable returned a null value");
     }
 }
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableFromIterable.java b/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableFromIterable.java
index c8dc87c0c3..7ae3f3e7d1 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableFromIterable.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableFromIterable.java
@@ -14,13 +14,13 @@
 package io.reactivex.rxjava3.internal.operators.flowable;
 
 import java.util.Iterator;
+import java.util.Objects;
 
 import org.reactivestreams.Subscriber;
 
 import io.reactivex.rxjava3.annotations.Nullable;
 import io.reactivex.rxjava3.core.Flowable;
 import io.reactivex.rxjava3.exceptions.Exceptions;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.internal.fuseable.ConditionalSubscriber;
 import io.reactivex.rxjava3.internal.subscriptions.*;
 import io.reactivex.rxjava3.internal.util.BackpressureHelper;
@@ -101,7 +101,7 @@ public final T poll() {
                     return null;
                 }
             }
-            return ObjectHelper.requireNonNull(it.next(), "Iterator.next() returned a null value");
+            return Objects.requireNonNull(it.next(), "Iterator.next() returned a null value");
         }
 
         @Override
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableFromSupplier.java b/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableFromSupplier.java
index bd714ee6c0..7be86d618b 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableFromSupplier.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableFromSupplier.java
@@ -18,10 +18,11 @@
 import io.reactivex.rxjava3.core.Flowable;
 import io.reactivex.rxjava3.exceptions.Exceptions;
 import io.reactivex.rxjava3.functions.Supplier;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.internal.subscriptions.DeferredScalarSubscription;
 import io.reactivex.rxjava3.plugins.RxJavaPlugins;
 
+import java.util.Objects;
+
 /**
  * Call a Supplier for each incoming Subscriber and signal the returned value or the thrown exception.
  * @param <T> the value type and element type returned by the supplier and the flow
@@ -42,7 +43,7 @@ public void subscribeActual(Subscriber<? super T> s) {
 
         T t;
         try {
-            t = ObjectHelper.requireNonNull(supplier.get(), "The supplier returned a null value");
+            t = Objects.requireNonNull(supplier.get(), "The supplier returned a null value");
         } catch (Throwable ex) {
             Exceptions.throwIfFatal(ex);
             if (deferred.isCancelled()) {
@@ -58,6 +59,6 @@ public void subscribeActual(Subscriber<? super T> s) {
 
     @Override
     public T get() throws Throwable {
-        return ObjectHelper.requireNonNull(supplier.get(), "The supplier returned a null value");
+        return Objects.requireNonNull(supplier.get(), "The supplier returned a null value");
     }
 }
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableGroupJoin.java b/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableGroupJoin.java
index 213073c672..ccd80c53d9 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableGroupJoin.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableGroupJoin.java
@@ -25,7 +25,6 @@
 import io.reactivex.rxjava3.disposables.*;
 import io.reactivex.rxjava3.exceptions.*;
 import io.reactivex.rxjava3.functions.*;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.internal.fuseable.SimpleQueue;
 import io.reactivex.rxjava3.internal.queue.SpscLinkedArrayQueue;
 import io.reactivex.rxjava3.internal.subscriptions.SubscriptionHelper;
@@ -247,7 +246,7 @@ void drain() {
                         Publisher<TLeftEnd> p;
 
                         try {
-                            p = ObjectHelper.requireNonNull(leftEnd.apply(left), "The leftEnd returned a null Publisher");
+                            p = Objects.requireNonNull(leftEnd.apply(left), "The leftEnd returned a null Publisher");
                         } catch (Throwable exc) {
                             fail(exc, a, q);
                             return;
@@ -269,7 +268,7 @@ void drain() {
                         R w;
 
                         try {
-                            w = ObjectHelper.requireNonNull(resultSelector.apply(left, up), "The resultSelector returned a null value");
+                            w = Objects.requireNonNull(resultSelector.apply(left, up), "The resultSelector returned a null value");
                         } catch (Throwable exc) {
                             fail(exc, a, q);
                             return;
@@ -299,7 +298,7 @@ else if (mode == RIGHT_VALUE) {
                         Publisher<TRightEnd> p;
 
                         try {
-                            p = ObjectHelper.requireNonNull(rightEnd.apply(right), "The rightEnd returned a null Publisher");
+                            p = Objects.requireNonNull(rightEnd.apply(right), "The rightEnd returned a null Publisher");
                         } catch (Throwable exc) {
                             fail(exc, a, q);
                             return;
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableInternalHelper.java b/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableInternalHelper.java
index 243d58b9b8..f8f97191fd 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableInternalHelper.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableInternalHelper.java
@@ -12,6 +12,7 @@
  */
 package io.reactivex.rxjava3.internal.operators.flowable;
 
+import java.util.Objects;
 import java.util.concurrent.TimeUnit;
 
 import org.reactivestreams.*;
@@ -76,7 +77,7 @@ static final class ItemDelayFunction<T, U> implements Function<T, Publisher<T>>
 
         @Override
         public Publisher<T> apply(final T v) throws Throwable {
-            Publisher<U> p = ObjectHelper.requireNonNull(itemDelay.apply(v), "The itemDelay returned a null Publisher");
+            Publisher<U> p = Objects.requireNonNull(itemDelay.apply(v), "The itemDelay returned a null Publisher");
             return new FlowableTakePublisher<U>(p, 1).map(Functions.justFunction(v)).defaultIfEmpty(v);
         }
     }
@@ -164,7 +165,7 @@ static final class FlatMapWithCombinerOuter<T, R, U> implements Function<T, Publ
         @Override
         public Publisher<R> apply(final T t) throws Throwable {
             @SuppressWarnings("unchecked")
-            Publisher<U> u = (Publisher<U>)ObjectHelper.requireNonNull(mapper.apply(t), "The mapper returned a null Publisher");
+            Publisher<U> u = (Publisher<U>)Objects.requireNonNull(mapper.apply(t), "The mapper returned a null Publisher");
             return new FlowableMapPublisher<U, R>(u, new FlatMapWithCombinerInner<U, R, T>(combiner, t));
         }
     }
@@ -184,7 +185,7 @@ static final class FlatMapIntoIterable<T, U> implements Function<T, Publisher<U>
 
         @Override
         public Publisher<U> apply(T t) throws Throwable {
-            return new FlowableFromIterable<U>(ObjectHelper.requireNonNull(mapper.apply(t), "The mapper returned a null Iterable"));
+            return new FlowableFromIterable<U>(Objects.requireNonNull(mapper.apply(t), "The mapper returned a null Iterable"));
         }
     }
 
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableJoin.java b/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableJoin.java
index 591cdb159a..df8eff7049 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableJoin.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableJoin.java
@@ -22,7 +22,6 @@
 import io.reactivex.rxjava3.disposables.CompositeDisposable;
 import io.reactivex.rxjava3.exceptions.*;
 import io.reactivex.rxjava3.functions.*;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.internal.fuseable.SimpleQueue;
 import io.reactivex.rxjava3.internal.operators.flowable.FlowableGroupJoin.*;
 import io.reactivex.rxjava3.internal.queue.SpscLinkedArrayQueue;
@@ -223,7 +222,7 @@ void drain() {
                         Publisher<TLeftEnd> p;
 
                         try {
-                            p = ObjectHelper.requireNonNull(leftEnd.apply(left), "The leftEnd returned a null Publisher");
+                            p = Objects.requireNonNull(leftEnd.apply(left), "The leftEnd returned a null Publisher");
                         } catch (Throwable exc) {
                             fail(exc, a, q);
                             return;
@@ -250,7 +249,7 @@ void drain() {
                             R w;
 
                             try {
-                                w = ObjectHelper.requireNonNull(resultSelector.apply(left, right), "The resultSelector returned a null value");
+                                w = Objects.requireNonNull(resultSelector.apply(left, right), "The resultSelector returned a null value");
                             } catch (Throwable exc) {
                                 fail(exc, a, q);
                                 return;
@@ -284,7 +283,7 @@ else if (mode == RIGHT_VALUE) {
                         Publisher<TRightEnd> p;
 
                         try {
-                            p = ObjectHelper.requireNonNull(rightEnd.apply(right), "The rightEnd returned a null Publisher");
+                            p = Objects.requireNonNull(rightEnd.apply(right), "The rightEnd returned a null Publisher");
                         } catch (Throwable exc) {
                             fail(exc, a, q);
                             return;
@@ -311,7 +310,7 @@ else if (mode == RIGHT_VALUE) {
                             R w;
 
                             try {
-                                w = ObjectHelper.requireNonNull(resultSelector.apply(left, right), "The resultSelector returned a null value");
+                                w = Objects.requireNonNull(resultSelector.apply(left, right), "The resultSelector returned a null value");
                             } catch (Throwable exc) {
                                 fail(exc, a, q);
                                 return;
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableMap.java b/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableMap.java
index cec093d278..208baca0b2 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableMap.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableMap.java
@@ -18,10 +18,11 @@
 import io.reactivex.rxjava3.annotations.Nullable;
 import io.reactivex.rxjava3.core.Flowable;
 import io.reactivex.rxjava3.functions.Function;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.internal.fuseable.ConditionalSubscriber;
 import io.reactivex.rxjava3.internal.subscribers.*;
 
+import java.util.Objects;
+
 public final class FlowableMap<T, U> extends AbstractFlowableWithUpstream<T, U> {
     final Function<? super T, ? extends U> mapper;
     public FlowableMap(Flowable<T> source, Function<? super T, ? extends U> mapper) {
@@ -60,7 +61,7 @@ public void onNext(T t) {
             U v;
 
             try {
-                v = ObjectHelper.requireNonNull(mapper.apply(t), "The mapper function returned a null value.");
+                v = Objects.requireNonNull(mapper.apply(t), "The mapper function returned a null value.");
             } catch (Throwable ex) {
                 fail(ex);
                 return;
@@ -77,7 +78,7 @@ public int requestFusion(int mode) {
         @Override
         public U poll() throws Throwable {
             T t = qs.poll();
-            return t != null ? ObjectHelper.<U>requireNonNull(mapper.apply(t), "The mapper function returned a null value.") : null;
+            return t != null ? Objects.requireNonNull(mapper.apply(t), "The mapper function returned a null value.") : null;
         }
     }
 
@@ -103,7 +104,7 @@ public void onNext(T t) {
             U v;
 
             try {
-                v = ObjectHelper.requireNonNull(mapper.apply(t), "The mapper function returned a null value.");
+                v = Objects.requireNonNull(mapper.apply(t), "The mapper function returned a null value.");
             } catch (Throwable ex) {
                 fail(ex);
                 return;
@@ -120,7 +121,7 @@ public boolean tryOnNext(T t) {
             U v;
 
             try {
-                v = ObjectHelper.requireNonNull(mapper.apply(t), "The mapper function returned a null value.");
+                v = Objects.requireNonNull(mapper.apply(t), "The mapper function returned a null value.");
             } catch (Throwable ex) {
                 fail(ex);
                 return true;
@@ -137,7 +138,7 @@ public int requestFusion(int mode) {
         @Override
         public U poll() throws Throwable {
             T t = qs.poll();
-            return t != null ? ObjectHelper.<U>requireNonNull(mapper.apply(t), "The mapper function returned a null value.") : null;
+            return t != null ? Objects.requireNonNull(mapper.apply(t), "The mapper function returned a null value.") : null;
         }
     }
 
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableMapNotification.java b/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableMapNotification.java
index 9998bee06b..cdfb0b0bb5 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableMapNotification.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableMapNotification.java
@@ -18,9 +18,10 @@
 import io.reactivex.rxjava3.core.Flowable;
 import io.reactivex.rxjava3.exceptions.*;
 import io.reactivex.rxjava3.functions.*;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.internal.subscribers.SinglePostCompleteSubscriber;
 
+import java.util.Objects;
+
 public final class FlowableMapNotification<T, R> extends AbstractFlowableWithUpstream<T, R> {
 
     final Function<? super T, ? extends R> onNextMapper;
@@ -66,7 +67,7 @@ public void onNext(T t) {
             R p;
 
             try {
-                p = ObjectHelper.requireNonNull(onNextMapper.apply(t), "The onNext publisher returned is null");
+                p = Objects.requireNonNull(onNextMapper.apply(t), "The onNext publisher returned is null");
             } catch (Throwable e) {
                 Exceptions.throwIfFatal(e);
                 downstream.onError(e);
@@ -82,7 +83,7 @@ public void onError(Throwable t) {
             R p;
 
             try {
-                p = ObjectHelper.requireNonNull(onErrorMapper.apply(t), "The onError publisher returned is null");
+                p = Objects.requireNonNull(onErrorMapper.apply(t), "The onError publisher returned is null");
             } catch (Throwable e) {
                 Exceptions.throwIfFatal(e);
                 downstream.onError(new CompositeException(t, e));
@@ -97,7 +98,7 @@ public void onComplete() {
             R p;
 
             try {
-                p = ObjectHelper.requireNonNull(onCompleteSupplier.get(), "The onComplete publisher returned is null");
+                p = Objects.requireNonNull(onCompleteSupplier.get(), "The onComplete publisher returned is null");
             } catch (Throwable e) {
                 Exceptions.throwIfFatal(e);
                 downstream.onError(e);
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableOnErrorNext.java b/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableOnErrorNext.java
index 7a186cdec0..1d939022b4 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableOnErrorNext.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableOnErrorNext.java
@@ -18,10 +18,11 @@
 import io.reactivex.rxjava3.core.*;
 import io.reactivex.rxjava3.exceptions.*;
 import io.reactivex.rxjava3.functions.Function;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.internal.subscriptions.SubscriptionArbiter;
 import io.reactivex.rxjava3.plugins.RxJavaPlugins;
 
+import java.util.Objects;
+
 public final class FlowableOnErrorNext<T> extends AbstractFlowableWithUpstream<T, T> {
     final Function<? super Throwable, ? extends Publisher<? extends T>> nextSupplier;
 
@@ -90,7 +91,7 @@ public void onError(Throwable t) {
             Publisher<? extends T> p;
 
             try {
-                p = ObjectHelper.requireNonNull(nextSupplier.apply(t), "The nextSupplier returned a null Publisher");
+                p = Objects.requireNonNull(nextSupplier.apply(t), "The nextSupplier returned a null Publisher");
             } catch (Throwable e) {
                 Exceptions.throwIfFatal(e);
                 downstream.onError(new CompositeException(t, e));
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableOnErrorReturn.java b/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableOnErrorReturn.java
index df57dd5c00..4a908cc113 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableOnErrorReturn.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableOnErrorReturn.java
@@ -18,9 +18,10 @@
 import io.reactivex.rxjava3.core.Flowable;
 import io.reactivex.rxjava3.exceptions.*;
 import io.reactivex.rxjava3.functions.Function;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.internal.subscribers.SinglePostCompleteSubscriber;
 
+import java.util.Objects;
+
 public final class FlowableOnErrorReturn<T> extends AbstractFlowableWithUpstream<T, T> {
     final Function<? super Throwable, ? extends T> valueSupplier;
     public FlowableOnErrorReturn(Flowable<T> source, Function<? super Throwable, ? extends T> valueSupplier) {
@@ -54,7 +55,7 @@ public void onNext(T t) {
         public void onError(Throwable t) {
             T v;
             try {
-                v = ObjectHelper.requireNonNull(valueSupplier.apply(t), "The valueSupplier returned a null value");
+                v = Objects.requireNonNull(valueSupplier.apply(t), "The valueSupplier returned a null value");
             } catch (Throwable ex) {
                 Exceptions.throwIfFatal(ex);
                 downstream.onError(new CompositeException(t, ex));
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowablePublishMulticast.java b/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowablePublishMulticast.java
index cc36e86821..702955bf02 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowablePublishMulticast.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowablePublishMulticast.java
@@ -16,6 +16,7 @@
 
 package io.reactivex.rxjava3.internal.operators.flowable;
 
+import java.util.Objects;
 import java.util.concurrent.atomic.*;
 
 import org.reactivestreams.*;
@@ -24,7 +25,6 @@
 import io.reactivex.rxjava3.disposables.Disposable;
 import io.reactivex.rxjava3.exceptions.*;
 import io.reactivex.rxjava3.functions.Function;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.internal.fuseable.*;
 import io.reactivex.rxjava3.internal.subscriptions.*;
 import io.reactivex.rxjava3.internal.util.*;
@@ -60,7 +60,7 @@ protected void subscribeActual(Subscriber<? super R> s) {
         Publisher<? extends R> other;
 
         try {
-            other = ObjectHelper.requireNonNull(selector.apply(mp), "selector returned a null Publisher");
+            other = Objects.requireNonNull(selector.apply(mp), "selector returned a null Publisher");
         } catch (Throwable ex) {
             Exceptions.throwIfFatal(ex);
             EmptySubscription.error(ex, s);
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableReduce.java b/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableReduce.java
index 4da1d68d99..9d3d3f4794 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableReduce.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableReduce.java
@@ -18,10 +18,11 @@
 import io.reactivex.rxjava3.core.*;
 import io.reactivex.rxjava3.exceptions.Exceptions;
 import io.reactivex.rxjava3.functions.BiFunction;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.internal.subscriptions.*;
 import io.reactivex.rxjava3.plugins.RxJavaPlugins;
 
+import java.util.Objects;
+
 /**
  * Reduces a sequence via a function into a single value or signals NoSuchElementException for
  * an empty source.
@@ -77,7 +78,7 @@ public void onNext(T t) {
                 value = t;
             } else {
                 try {
-                    value = ObjectHelper.requireNonNull(reducer.apply(v, t), "The reducer returned a null value");
+                    value = Objects.requireNonNull(reducer.apply(v, t), "The reducer returned a null value");
                 } catch (Throwable ex) {
                     Exceptions.throwIfFatal(ex);
                     upstream.cancel();
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableReduceMaybe.java b/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableReduceMaybe.java
index 72b4f1ac28..2de3b633fe 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableReduceMaybe.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableReduceMaybe.java
@@ -19,11 +19,12 @@
 import io.reactivex.rxjava3.disposables.Disposable;
 import io.reactivex.rxjava3.exceptions.Exceptions;
 import io.reactivex.rxjava3.functions.BiFunction;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.internal.fuseable.*;
 import io.reactivex.rxjava3.internal.subscriptions.SubscriptionHelper;
 import io.reactivex.rxjava3.plugins.RxJavaPlugins;
 
+import java.util.Objects;
+
 /**
  * Reduce a Flowable into a single value exposed as Single or signal NoSuchElementException.
  *
@@ -105,7 +106,7 @@ public void onNext(T t) {
                 value = t;
             } else {
                 try {
-                    value = ObjectHelper.requireNonNull(reducer.apply(v, t), "The reducer returned a null value");
+                    value = Objects.requireNonNull(reducer.apply(v, t), "The reducer returned a null value");
                 } catch (Throwable ex) {
                     Exceptions.throwIfFatal(ex);
                     upstream.cancel();
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableReduceSeedSingle.java b/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableReduceSeedSingle.java
index cf489963ed..ec570639c6 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableReduceSeedSingle.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableReduceSeedSingle.java
@@ -19,10 +19,11 @@
 import io.reactivex.rxjava3.disposables.Disposable;
 import io.reactivex.rxjava3.exceptions.Exceptions;
 import io.reactivex.rxjava3.functions.BiFunction;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.internal.subscriptions.SubscriptionHelper;
 import io.reactivex.rxjava3.plugins.RxJavaPlugins;
 
+import java.util.Objects;
+
 /**
  * Reduce a sequence of values, starting from a seed value and by using
  * an accumulator function and return the last accumulated value.
@@ -81,7 +82,7 @@ public void onNext(T value) {
             R v = this.value;
             if (v != null) {
                 try {
-                    this.value = ObjectHelper.requireNonNull(reducer.apply(v, value), "The reducer returned a null value");
+                    this.value = Objects.requireNonNull(reducer.apply(v, value), "The reducer returned a null value");
                 } catch (Throwable ex) {
                     Exceptions.throwIfFatal(ex);
                     upstream.cancel();
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableReduceWithSingle.java b/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableReduceWithSingle.java
index ca8be6779e..343d72c4e3 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableReduceWithSingle.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableReduceWithSingle.java
@@ -19,9 +19,10 @@
 import io.reactivex.rxjava3.exceptions.Exceptions;
 import io.reactivex.rxjava3.functions.*;
 import io.reactivex.rxjava3.internal.disposables.EmptyDisposable;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.internal.operators.flowable.FlowableReduceSeedSingle.ReduceSeedObserver;
 
+import java.util.Objects;
+
 /**
  * Reduce a sequence of values, starting from a generated seed value and by using
  * an accumulator function and return the last accumulated value.
@@ -48,7 +49,7 @@ protected void subscribeActual(SingleObserver<? super R> observer) {
         R seed;
 
         try {
-            seed = ObjectHelper.requireNonNull(seedSupplier.get(), "The seedSupplier returned a null value");
+            seed = Objects.requireNonNull(seedSupplier.get(), "The seedSupplier returned a null value");
         } catch (Throwable ex) {
             Exceptions.throwIfFatal(ex);
             EmptyDisposable.error(ex, observer);
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableRepeatWhen.java b/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableRepeatWhen.java
index 021b4dd387..dcd807aa2a 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableRepeatWhen.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableRepeatWhen.java
@@ -13,6 +13,7 @@
 
 package io.reactivex.rxjava3.internal.operators.flowable;
 
+import java.util.Objects;
 import java.util.concurrent.atomic.*;
 
 import org.reactivestreams.*;
@@ -20,7 +21,6 @@
 import io.reactivex.rxjava3.core.*;
 import io.reactivex.rxjava3.exceptions.Exceptions;
 import io.reactivex.rxjava3.functions.Function;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.internal.subscriptions.*;
 import io.reactivex.rxjava3.processors.*;
 import io.reactivex.rxjava3.subscribers.SerializedSubscriber;
@@ -44,7 +44,7 @@ public void subscribeActual(Subscriber<? super T> s) {
         Publisher<?> when;
 
         try {
-            when = ObjectHelper.requireNonNull(handler.apply(processor), "handler returned a null Publisher");
+            when = Objects.requireNonNull(handler.apply(processor), "handler returned a null Publisher");
         } catch (Throwable ex) {
             Exceptions.throwIfFatal(ex);
             EmptySubscription.error(ex, s);
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableRetryWhen.java b/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableRetryWhen.java
index ff7ddb84af..7307664353 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableRetryWhen.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableRetryWhen.java
@@ -18,12 +18,13 @@
 import io.reactivex.rxjava3.core.Flowable;
 import io.reactivex.rxjava3.exceptions.Exceptions;
 import io.reactivex.rxjava3.functions.Function;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.internal.operators.flowable.FlowableRepeatWhen.*;
 import io.reactivex.rxjava3.internal.subscriptions.EmptySubscription;
 import io.reactivex.rxjava3.processors.*;
 import io.reactivex.rxjava3.subscribers.SerializedSubscriber;
 
+import java.util.Objects;
+
 public final class FlowableRetryWhen<T> extends AbstractFlowableWithUpstream<T, T> {
     final Function<? super Flowable<Throwable>, ? extends Publisher<?>> handler;
 
@@ -42,7 +43,7 @@ public void subscribeActual(Subscriber<? super T> s) {
         Publisher<?> when;
 
         try {
-            when = ObjectHelper.requireNonNull(handler.apply(processor), "handler returned a null Publisher");
+            when = Objects.requireNonNull(handler.apply(processor), "handler returned a null Publisher");
         } catch (Throwable ex) {
             Exceptions.throwIfFatal(ex);
             EmptySubscription.error(ex, s);
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableScalarXMap.java b/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableScalarXMap.java
index 999cf48a51..2ef89c0023 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableScalarXMap.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableScalarXMap.java
@@ -18,10 +18,11 @@
 import io.reactivex.rxjava3.core.Flowable;
 import io.reactivex.rxjava3.exceptions.Exceptions;
 import io.reactivex.rxjava3.functions.*;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.internal.subscriptions.*;
 import io.reactivex.rxjava3.plugins.RxJavaPlugins;
 
+import java.util.Objects;
+
 /**
  * Utility classes to work with scalar-sourced XMap operators (where X == { flat, concat, switch }).
  */
@@ -64,7 +65,7 @@ public static <T, R> boolean tryScalarXMapSubscribe(Publisher<T> source,
             Publisher<? extends R> r;
 
             try {
-                r = ObjectHelper.requireNonNull(mapper.apply(t), "The mapper returned a null Publisher");
+                r = Objects.requireNonNull(mapper.apply(t), "The mapper returned a null Publisher");
             } catch (Throwable ex) {
                 Exceptions.throwIfFatal(ex);
                 EmptySubscription.error(ex, subscriber);
@@ -133,7 +134,7 @@ static final class ScalarXMapFlowable<T, R> extends Flowable<R> {
         public void subscribeActual(Subscriber<? super R> s) {
             Publisher<? extends R> other;
             try {
-                other = ObjectHelper.requireNonNull(mapper.apply(value), "The mapper returned a null Publisher");
+                other = Objects.requireNonNull(mapper.apply(value), "The mapper returned a null Publisher");
             } catch (Throwable e) {
                 EmptySubscription.error(e, s);
                 return;
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableScan.java b/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableScan.java
index 3dadb2968b..2fab24a484 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableScan.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableScan.java
@@ -18,10 +18,11 @@
 import io.reactivex.rxjava3.core.*;
 import io.reactivex.rxjava3.exceptions.Exceptions;
 import io.reactivex.rxjava3.functions.BiFunction;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.internal.subscriptions.SubscriptionHelper;
 import io.reactivex.rxjava3.plugins.RxJavaPlugins;
 
+import java.util.Objects;
+
 public final class FlowableScan<T> extends AbstractFlowableWithUpstream<T, T> {
     final BiFunction<T, T, T> accumulator;
     public FlowableScan(Flowable<T> source, BiFunction<T, T, T> accumulator) {
@@ -71,7 +72,7 @@ public void onNext(T t) {
                 T u;
 
                 try {
-                    u = ObjectHelper.requireNonNull(accumulator.apply(v, t), "The value returned by the accumulator is null");
+                    u = Objects.requireNonNull(accumulator.apply(v, t), "The value returned by the accumulator is null");
                 } catch (Throwable e) {
                     Exceptions.throwIfFatal(e);
                     upstream.cancel();
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableScanSeed.java b/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableScanSeed.java
index c1875f3070..da0b1870da 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableScanSeed.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableScanSeed.java
@@ -12,6 +12,7 @@
  */
 package io.reactivex.rxjava3.internal.operators.flowable;
 
+import java.util.Objects;
 import java.util.concurrent.atomic.*;
 
 import org.reactivestreams.*;
@@ -19,7 +20,6 @@
 import io.reactivex.rxjava3.core.*;
 import io.reactivex.rxjava3.exceptions.Exceptions;
 import io.reactivex.rxjava3.functions.*;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.internal.fuseable.SimplePlainQueue;
 import io.reactivex.rxjava3.internal.queue.SpscArrayQueue;
 import io.reactivex.rxjava3.internal.subscriptions.*;
@@ -41,7 +41,7 @@ protected void subscribeActual(Subscriber<? super R> s) {
         R r;
 
         try {
-            r = ObjectHelper.requireNonNull(seedSupplier.get(), "The seed supplied is null");
+            r = Objects.requireNonNull(seedSupplier.get(), "The seed supplied is null");
         } catch (Throwable e) {
             Exceptions.throwIfFatal(e);
             EmptySubscription.error(e, s);
@@ -109,7 +109,7 @@ public void onNext(T t) {
 
             R v = value;
             try {
-                v = ObjectHelper.requireNonNull(accumulator.apply(v, t), "The accumulator returned a null value");
+                v = Objects.requireNonNull(accumulator.apply(v, t), "The accumulator returned a null value");
             } catch (Throwable ex) {
                 Exceptions.throwIfFatal(ex);
                 upstream.cancel();
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableSwitchMap.java b/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableSwitchMap.java
index e77110b6a0..c618a0252b 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableSwitchMap.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableSwitchMap.java
@@ -13,6 +13,7 @@
 
 package io.reactivex.rxjava3.internal.operators.flowable;
 
+import java.util.Objects;
 import java.util.concurrent.atomic.*;
 
 import org.reactivestreams.*;
@@ -20,7 +21,6 @@
 import io.reactivex.rxjava3.core.*;
 import io.reactivex.rxjava3.exceptions.*;
 import io.reactivex.rxjava3.functions.Function;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.internal.fuseable.*;
 import io.reactivex.rxjava3.internal.queue.SpscArrayQueue;
 import io.reactivex.rxjava3.internal.subscriptions.SubscriptionHelper;
@@ -110,7 +110,7 @@ public void onNext(T t) {
 
             Publisher<? extends R> p;
             try {
-                p = ObjectHelper.requireNonNull(mapper.apply(t), "The publisher returned is null");
+                p = Objects.requireNonNull(mapper.apply(t), "The publisher returned is null");
             } catch (Throwable e) {
                 Exceptions.throwIfFatal(e);
                 upstream.cancel();
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableTimeout.java b/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableTimeout.java
index b45755fc30..c5879c2e74 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableTimeout.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableTimeout.java
@@ -13,6 +13,7 @@
 
 package io.reactivex.rxjava3.internal.operators.flowable;
 
+import java.util.Objects;
 import java.util.concurrent.TimeoutException;
 import java.util.concurrent.atomic.*;
 
@@ -23,7 +24,6 @@
 import io.reactivex.rxjava3.exceptions.Exceptions;
 import io.reactivex.rxjava3.functions.Function;
 import io.reactivex.rxjava3.internal.disposables.SequentialDisposable;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.internal.operators.flowable.FlowableTimeoutTimed.TimeoutSupport;
 import io.reactivex.rxjava3.internal.subscriptions.*;
 import io.reactivex.rxjava3.plugins.RxJavaPlugins;
@@ -108,7 +108,7 @@ public void onNext(T t) {
             Publisher<?> itemTimeoutPublisher;
 
             try {
-                itemTimeoutPublisher = ObjectHelper.requireNonNull(
+                itemTimeoutPublisher = Objects.requireNonNull(
                         itemTimeoutIndicator.apply(t),
                         "The itemTimeoutIndicator returned a null Publisher.");
             } catch (Throwable ex) {
@@ -243,7 +243,7 @@ public void onNext(T t) {
             Publisher<?> itemTimeoutPublisher;
 
             try {
-                itemTimeoutPublisher = ObjectHelper.requireNonNull(
+                itemTimeoutPublisher = Objects.requireNonNull(
                         itemTimeoutIndicator.apply(t),
                         "The itemTimeoutIndicator returned a null Publisher.");
             } catch (Throwable ex) {
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableUsing.java b/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableUsing.java
index 9c0dc74d4c..7e2e91c672 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableUsing.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableUsing.java
@@ -13,6 +13,7 @@
 
 package io.reactivex.rxjava3.internal.operators.flowable;
 
+import java.util.Objects;
 import java.util.concurrent.atomic.AtomicBoolean;
 
 import org.reactivestreams.*;
@@ -20,7 +21,6 @@
 import io.reactivex.rxjava3.core.*;
 import io.reactivex.rxjava3.exceptions.*;
 import io.reactivex.rxjava3.functions.*;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.internal.subscriptions.*;
 import io.reactivex.rxjava3.plugins.RxJavaPlugins;
 
@@ -54,7 +54,7 @@ public void subscribeActual(Subscriber<? super T> s) {
 
         Publisher<? extends T> source;
         try {
-            source = ObjectHelper.requireNonNull(sourceSupplier.apply(resource), "The sourceSupplier returned a null Publisher");
+            source = Objects.requireNonNull(sourceSupplier.apply(resource), "The sourceSupplier returned a null Publisher");
         } catch (Throwable e) {
             Exceptions.throwIfFatal(e);
             try {
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableWindowBoundarySelector.java b/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableWindowBoundarySelector.java
index 63ee8ccf3c..4e38351ef7 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableWindowBoundarySelector.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableWindowBoundarySelector.java
@@ -22,7 +22,6 @@
 import io.reactivex.rxjava3.disposables.*;
 import io.reactivex.rxjava3.exceptions.*;
 import io.reactivex.rxjava3.functions.Function;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.internal.fuseable.SimplePlainQueue;
 import io.reactivex.rxjava3.internal.queue.MpscLinkedQueue;
 import io.reactivex.rxjava3.internal.subscriptions.SubscriptionHelper;
@@ -244,7 +243,7 @@ void drain() {
 
                                     Publisher<V> endSource;
                                     try {
-                                        endSource = ObjectHelper.requireNonNull(closingIndicator.apply(startItem), "The closingIndicator returned a null Publisher");
+                                        endSource = Objects.requireNonNull(closingIndicator.apply(startItem), "The closingIndicator returned a null Publisher");
                                     } catch (Throwable ex) {
                                         upstream.cancel();
                                         startSubscriber.cancel();
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableWithLatestFrom.java b/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableWithLatestFrom.java
index c3ec3ab5f9..049befd1f4 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableWithLatestFrom.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableWithLatestFrom.java
@@ -13,6 +13,7 @@
 
 package io.reactivex.rxjava3.internal.operators.flowable;
 
+import java.util.Objects;
 import java.util.concurrent.atomic.*;
 
 import org.reactivestreams.*;
@@ -20,7 +21,6 @@
 import io.reactivex.rxjava3.core.*;
 import io.reactivex.rxjava3.exceptions.Exceptions;
 import io.reactivex.rxjava3.functions.BiFunction;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.internal.fuseable.ConditionalSubscriber;
 import io.reactivex.rxjava3.internal.subscriptions.SubscriptionHelper;
 import io.reactivex.rxjava3.subscribers.SerializedSubscriber;
@@ -84,7 +84,7 @@ public boolean tryOnNext(T t) {
             if (u != null) {
                 R r;
                 try {
-                    r = ObjectHelper.requireNonNull(combiner.apply(t, u), "The combiner returned a null value");
+                    r = Objects.requireNonNull(combiner.apply(t, u), "The combiner returned a null value");
                 } catch (Throwable e) {
                     Exceptions.throwIfFatal(e);
                     cancel();
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableWithLatestFromMany.java b/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableWithLatestFromMany.java
index 7c3b06ed8c..1d1be81e05 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableWithLatestFromMany.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableWithLatestFromMany.java
@@ -13,6 +13,7 @@
 package io.reactivex.rxjava3.internal.operators.flowable;
 
 import java.util.Arrays;
+import java.util.Objects;
 import java.util.concurrent.atomic.*;
 
 import org.reactivestreams.*;
@@ -21,7 +22,6 @@
 import io.reactivex.rxjava3.core.*;
 import io.reactivex.rxjava3.exceptions.Exceptions;
 import io.reactivex.rxjava3.functions.Function;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.internal.fuseable.ConditionalSubscriber;
 import io.reactivex.rxjava3.internal.subscriptions.*;
 import io.reactivex.rxjava3.internal.util.*;
@@ -174,7 +174,7 @@ public boolean tryOnNext(T t) {
             R v;
 
             try {
-                v = ObjectHelper.requireNonNull(combiner.apply(objects), "The combiner returned a null value");
+                v = Objects.requireNonNull(combiner.apply(objects), "The combiner returned a null value");
             } catch (Throwable ex) {
                 Exceptions.throwIfFatal(ex);
                 cancel();
@@ -297,7 +297,7 @@ void dispose() {
     final class SingletonArrayFunc implements Function<T, R> {
         @Override
         public R apply(T t) throws Throwable {
-            return ObjectHelper.requireNonNull(combiner.apply(new Object[] { t }), "The combiner returned a null value");
+            return Objects.requireNonNull(combiner.apply(new Object[] { t }), "The combiner returned a null value");
         }
     }
 }
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableZip.java b/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableZip.java
index 09f1a59a7f..27f1f8e2dc 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableZip.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableZip.java
@@ -14,6 +14,7 @@
 package io.reactivex.rxjava3.internal.operators.flowable;
 
 import java.util.Arrays;
+import java.util.Objects;
 import java.util.concurrent.atomic.*;
 
 import org.reactivestreams.*;
@@ -21,7 +22,6 @@
 import io.reactivex.rxjava3.core.*;
 import io.reactivex.rxjava3.exceptions.Exceptions;
 import io.reactivex.rxjava3.functions.Function;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.internal.fuseable.*;
 import io.reactivex.rxjava3.internal.queue.SpscArrayQueue;
 import io.reactivex.rxjava3.internal.subscriptions.*;
@@ -229,7 +229,7 @@ void drain() {
                     R v;
 
                     try {
-                        v = ObjectHelper.requireNonNull(zipper.apply(values.clone()), "The zipper returned a null value");
+                        v = Objects.requireNonNull(zipper.apply(values.clone()), "The zipper returned a null value");
                     } catch (Throwable ex) {
                         Exceptions.throwIfFatal(ex);
                         cancelAll();
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableZipIterable.java b/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableZipIterable.java
index fad3df6e8e..a41c591fe2 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableZipIterable.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/flowable/FlowableZipIterable.java
@@ -14,13 +14,13 @@
 package io.reactivex.rxjava3.internal.operators.flowable;
 
 import java.util.Iterator;
+import java.util.Objects;
 
 import org.reactivestreams.*;
 
 import io.reactivex.rxjava3.core.*;
 import io.reactivex.rxjava3.exceptions.Exceptions;
 import io.reactivex.rxjava3.functions.BiFunction;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.internal.subscriptions.*;
 import io.reactivex.rxjava3.plugins.RxJavaPlugins;
 
@@ -41,7 +41,7 @@ public void subscribeActual(Subscriber<? super V> t) {
         Iterator<U> it;
 
         try {
-            it = ObjectHelper.requireNonNull(other.iterator(), "The iterator returned by other is null");
+            it = Objects.requireNonNull(other.iterator(), "The iterator returned by other is null");
         } catch (Throwable e) {
             Exceptions.throwIfFatal(e);
             EmptySubscription.error(e, t);
@@ -99,7 +99,7 @@ public void onNext(T t) {
             U u;
 
             try {
-                u = ObjectHelper.requireNonNull(iterator.next(), "The iterator returned a null value");
+                u = Objects.requireNonNull(iterator.next(), "The iterator returned a null value");
             } catch (Throwable e) {
                 error(e);
                 return;
@@ -107,7 +107,7 @@ public void onNext(T t) {
 
             V v;
             try {
-                v = ObjectHelper.requireNonNull(zipper.apply(t, u), "The zipper function returned a null value");
+                v = Objects.requireNonNull(zipper.apply(t, u), "The zipper function returned a null value");
             } catch (Throwable e) {
                 error(e);
                 return;
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/maybe/MaybeConcatIterable.java b/src/main/java/io/reactivex/rxjava3/internal/operators/maybe/MaybeConcatIterable.java
index b01b58c6a0..f3abd7ddb8 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/maybe/MaybeConcatIterable.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/maybe/MaybeConcatIterable.java
@@ -14,6 +14,7 @@
 package io.reactivex.rxjava3.internal.operators.maybe;
 
 import java.util.Iterator;
+import java.util.Objects;
 import java.util.concurrent.atomic.*;
 
 import org.reactivestreams.*;
@@ -22,7 +23,6 @@
 import io.reactivex.rxjava3.disposables.Disposable;
 import io.reactivex.rxjava3.exceptions.Exceptions;
 import io.reactivex.rxjava3.internal.disposables.SequentialDisposable;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.internal.subscriptions.*;
 import io.reactivex.rxjava3.internal.util.*;
 
@@ -45,7 +45,7 @@ protected void subscribeActual(Subscriber<? super T> s) {
         Iterator<? extends MaybeSource<? extends T>> it;
 
         try {
-            it = ObjectHelper.requireNonNull(sources.iterator(), "The sources Iterable returned a null Iterator");
+            it = Objects.requireNonNull(sources.iterator(), "The sources Iterable returned a null Iterator");
         } catch (Throwable ex) {
             Exceptions.throwIfFatal(ex);
             EmptySubscription.error(ex, s);
@@ -169,7 +169,7 @@ void drain() {
                             MaybeSource<? extends T> source;
 
                             try {
-                                source = ObjectHelper.requireNonNull(sources.next(), "The source Iterator returned a null MaybeSource");
+                                source = Objects.requireNonNull(sources.next(), "The source Iterator returned a null MaybeSource");
                             } catch (Throwable ex) {
                                 Exceptions.throwIfFatal(ex);
                                 a.onError(ex);
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/maybe/MaybeDefer.java b/src/main/java/io/reactivex/rxjava3/internal/operators/maybe/MaybeDefer.java
index 3146b4781d..ccba4e0041 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/maybe/MaybeDefer.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/maybe/MaybeDefer.java
@@ -17,7 +17,8 @@
 import io.reactivex.rxjava3.exceptions.Exceptions;
 import io.reactivex.rxjava3.functions.Supplier;
 import io.reactivex.rxjava3.internal.disposables.EmptyDisposable;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
+
+import java.util.Objects;
 
 /**
  * Defers the creation of the actual Maybe the incoming MaybeObserver is subscribed to.
@@ -37,7 +38,7 @@ protected void subscribeActual(MaybeObserver<? super T> observer) {
         MaybeSource<? extends T> source;
 
         try {
-            source = ObjectHelper.requireNonNull(maybeSupplier.get(), "The maybeSupplier returned a null MaybeSource");
+            source = Objects.requireNonNull(maybeSupplier.get(), "The maybeSupplier returned a null MaybeSource");
         } catch (Throwable ex) {
             Exceptions.throwIfFatal(ex);
             EmptyDisposable.error(ex, observer);
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/maybe/MaybeFlatMapBiSelector.java b/src/main/java/io/reactivex/rxjava3/internal/operators/maybe/MaybeFlatMapBiSelector.java
index c463567227..afb27373c5 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/maybe/MaybeFlatMapBiSelector.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/maybe/MaybeFlatMapBiSelector.java
@@ -13,6 +13,7 @@
 
 package io.reactivex.rxjava3.internal.operators.maybe;
 
+import java.util.Objects;
 import java.util.concurrent.atomic.AtomicReference;
 
 import io.reactivex.rxjava3.core.*;
@@ -20,12 +21,11 @@
 import io.reactivex.rxjava3.exceptions.Exceptions;
 import io.reactivex.rxjava3.functions.*;
 import io.reactivex.rxjava3.internal.disposables.DisposableHelper;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 
 /**
  * Maps a source item to another MaybeSource then calls a BiFunction with the
  * original item and the secondary item to generate the final result.
- * 
+ *
  * @param <T> the main value type
  * @param <U> the second value type
  * @param <R> the result value type
@@ -85,7 +85,7 @@ public void onSuccess(T value) {
             MaybeSource<? extends U> next;
 
             try {
-                next = ObjectHelper.requireNonNull(mapper.apply(value), "The mapper returned a null MaybeSource");
+                next = Objects.requireNonNull(mapper.apply(value), "The mapper returned a null MaybeSource");
             } catch (Throwable ex) {
                 Exceptions.throwIfFatal(ex);
                 inner.downstream.onError(ex);
@@ -139,7 +139,7 @@ public void onSuccess(U value) {
                 R r;
 
                 try {
-                    r = ObjectHelper.requireNonNull(resultSelector.apply(t, value), "The resultSelector returned a null value");
+                    r = Objects.requireNonNull(resultSelector.apply(t, value), "The resultSelector returned a null value");
                 } catch (Throwable ex) {
                     Exceptions.throwIfFatal(ex);
                     downstream.onError(ex);
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/maybe/MaybeFlatMapCompletable.java b/src/main/java/io/reactivex/rxjava3/internal/operators/maybe/MaybeFlatMapCompletable.java
index 7ad1008421..fb8bb9d9f1 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/maybe/MaybeFlatMapCompletable.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/maybe/MaybeFlatMapCompletable.java
@@ -13,6 +13,7 @@
 
 package io.reactivex.rxjava3.internal.operators.maybe;
 
+import java.util.Objects;
 import java.util.concurrent.atomic.AtomicReference;
 
 import io.reactivex.rxjava3.core.*;
@@ -20,7 +21,6 @@
 import io.reactivex.rxjava3.exceptions.Exceptions;
 import io.reactivex.rxjava3.functions.Function;
 import io.reactivex.rxjava3.internal.disposables.DisposableHelper;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 
 /**
  * Maps the success value of the source MaybeSource into a Completable.
@@ -80,7 +80,7 @@ public void onSuccess(T value) {
             CompletableSource cs;
 
             try {
-                cs = ObjectHelper.requireNonNull(mapper.apply(value), "The mapper returned a null CompletableSource");
+                cs = Objects.requireNonNull(mapper.apply(value), "The mapper returned a null CompletableSource");
             } catch (Throwable ex) {
                 Exceptions.throwIfFatal(ex);
                 onError(ex);
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/maybe/MaybeFlatMapIterableFlowable.java b/src/main/java/io/reactivex/rxjava3/internal/operators/maybe/MaybeFlatMapIterableFlowable.java
index 9c8aef2ba9..8460405dc9 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/maybe/MaybeFlatMapIterableFlowable.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/maybe/MaybeFlatMapIterableFlowable.java
@@ -14,6 +14,7 @@
 package io.reactivex.rxjava3.internal.operators.maybe;
 
 import java.util.Iterator;
+import java.util.Objects;
 import java.util.concurrent.atomic.AtomicLong;
 
 import org.reactivestreams.Subscriber;
@@ -24,7 +25,6 @@
 import io.reactivex.rxjava3.exceptions.Exceptions;
 import io.reactivex.rxjava3.functions.Function;
 import io.reactivex.rxjava3.internal.disposables.DisposableHelper;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.internal.subscriptions.*;
 import io.reactivex.rxjava3.internal.util.BackpressureHelper;
 
@@ -211,7 +211,7 @@ void drain() {
                         R v;
 
                         try {
-                            v = ObjectHelper.requireNonNull(iterator.next(), "The iterator returned a null value");
+                            v = Objects.requireNonNull(iterator.next(), "The iterator returned a null value");
                         } catch (Throwable ex) {
                             Exceptions.throwIfFatal(ex);
                             a.onError(ex);
@@ -283,7 +283,7 @@ public R poll() throws Exception {
             Iterator<? extends R> iterator = it;
 
             if (iterator != null) {
-                R v = ObjectHelper.requireNonNull(iterator.next(), "The iterator returned a null value");
+                R v = Objects.requireNonNull(iterator.next(), "The iterator returned a null value");
                 if (!iterator.hasNext()) {
                     it = null;
                 }
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/maybe/MaybeFlatMapIterableObservable.java b/src/main/java/io/reactivex/rxjava3/internal/operators/maybe/MaybeFlatMapIterableObservable.java
index 8c2b4816c9..afbb56f8e9 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/maybe/MaybeFlatMapIterableObservable.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/maybe/MaybeFlatMapIterableObservable.java
@@ -14,6 +14,7 @@
 package io.reactivex.rxjava3.internal.operators.maybe;
 
 import java.util.Iterator;
+import java.util.Objects;
 
 import io.reactivex.rxjava3.annotations.Nullable;
 import io.reactivex.rxjava3.core.*;
@@ -21,7 +22,6 @@
 import io.reactivex.rxjava3.exceptions.Exceptions;
 import io.reactivex.rxjava3.functions.Function;
 import io.reactivex.rxjava3.internal.disposables.DisposableHelper;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.internal.observers.BasicQueueDisposable;
 
 /**
@@ -193,7 +193,7 @@ public R poll() throws Exception {
             Iterator<? extends R> iterator = it;
 
             if (iterator != null) {
-                R v = ObjectHelper.requireNonNull(iterator.next(), "The iterator returned a null value");
+                R v = Objects.requireNonNull(iterator.next(), "The iterator returned a null value");
                 if (!iterator.hasNext()) {
                     it = null;
                 }
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/maybe/MaybeFlatMapNotification.java b/src/main/java/io/reactivex/rxjava3/internal/operators/maybe/MaybeFlatMapNotification.java
index 39007e5117..2f50f8cd7d 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/maybe/MaybeFlatMapNotification.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/maybe/MaybeFlatMapNotification.java
@@ -13,6 +13,7 @@
 
 package io.reactivex.rxjava3.internal.operators.maybe;
 
+import java.util.Objects;
 import java.util.concurrent.atomic.AtomicReference;
 
 import io.reactivex.rxjava3.core.*;
@@ -20,7 +21,6 @@
 import io.reactivex.rxjava3.exceptions.*;
 import io.reactivex.rxjava3.functions.*;
 import io.reactivex.rxjava3.internal.disposables.DisposableHelper;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 
 /**
  * Maps a value into a MaybeSource and relays its signal.
@@ -102,7 +102,7 @@ public void onSuccess(T value) {
             MaybeSource<? extends R> source;
 
             try {
-                source = ObjectHelper.requireNonNull(onSuccessMapper.apply(value), "The onSuccessMapper returned a null MaybeSource");
+                source = Objects.requireNonNull(onSuccessMapper.apply(value), "The onSuccessMapper returned a null MaybeSource");
             } catch (Throwable ex) {
                 Exceptions.throwIfFatal(ex);
                 downstream.onError(ex);
@@ -117,7 +117,7 @@ public void onError(Throwable e) {
             MaybeSource<? extends R> source;
 
             try {
-                source = ObjectHelper.requireNonNull(onErrorMapper.apply(e), "The onErrorMapper returned a null MaybeSource");
+                source = Objects.requireNonNull(onErrorMapper.apply(e), "The onErrorMapper returned a null MaybeSource");
             } catch (Throwable ex) {
                 Exceptions.throwIfFatal(ex);
                 downstream.onError(new CompositeException(e, ex));
@@ -132,7 +132,7 @@ public void onComplete() {
             MaybeSource<? extends R> source;
 
             try {
-                source = ObjectHelper.requireNonNull(onCompleteSupplier.get(), "The onCompleteSupplier returned a null MaybeSource");
+                source = Objects.requireNonNull(onCompleteSupplier.get(), "The onCompleteSupplier returned a null MaybeSource");
             } catch (Throwable ex) {
                 Exceptions.throwIfFatal(ex);
                 downstream.onError(ex);
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/maybe/MaybeFlatMapSingle.java b/src/main/java/io/reactivex/rxjava3/internal/operators/maybe/MaybeFlatMapSingle.java
index 011cbd9ab7..38ec9417d9 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/maybe/MaybeFlatMapSingle.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/maybe/MaybeFlatMapSingle.java
@@ -14,6 +14,7 @@
 package io.reactivex.rxjava3.internal.operators.maybe;
 
 import java.util.NoSuchElementException;
+import java.util.Objects;
 import java.util.concurrent.atomic.AtomicReference;
 
 import io.reactivex.rxjava3.core.*;
@@ -21,7 +22,6 @@
 import io.reactivex.rxjava3.exceptions.Exceptions;
 import io.reactivex.rxjava3.functions.Function;
 import io.reactivex.rxjava3.internal.disposables.DisposableHelper;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 
 /**
  * Maps the success value of the source MaybeSource into a Single.
@@ -81,7 +81,7 @@ public void onSuccess(T value) {
             SingleSource<? extends R> ss;
 
             try {
-                ss = ObjectHelper.requireNonNull(mapper.apply(value), "The mapper returned a null SingleSource");
+                ss = Objects.requireNonNull(mapper.apply(value), "The mapper returned a null SingleSource");
             } catch (Throwable ex) {
                 Exceptions.throwIfFatal(ex);
                 onError(ex);
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/maybe/MaybeFlatMapSingleElement.java b/src/main/java/io/reactivex/rxjava3/internal/operators/maybe/MaybeFlatMapSingleElement.java
index e823b06936..b917a5885e 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/maybe/MaybeFlatMapSingleElement.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/maybe/MaybeFlatMapSingleElement.java
@@ -13,6 +13,7 @@
 
 package io.reactivex.rxjava3.internal.operators.maybe;
 
+import java.util.Objects;
 import java.util.concurrent.atomic.AtomicReference;
 
 import io.reactivex.rxjava3.core.*;
@@ -20,7 +21,6 @@
 import io.reactivex.rxjava3.exceptions.Exceptions;
 import io.reactivex.rxjava3.functions.Function;
 import io.reactivex.rxjava3.internal.disposables.DisposableHelper;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 
 /**
  * Maps the success value of the source MaybeSource into a Single.
@@ -82,7 +82,7 @@ public void onSuccess(T value) {
             SingleSource<? extends R> ss;
 
             try {
-                ss = ObjectHelper.requireNonNull(mapper.apply(value), "The mapper returned a null SingleSource");
+                ss = Objects.requireNonNull(mapper.apply(value), "The mapper returned a null SingleSource");
             } catch (Throwable ex) {
                 Exceptions.throwIfFatal(ex);
                 onError(ex);
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/maybe/MaybeFlatten.java b/src/main/java/io/reactivex/rxjava3/internal/operators/maybe/MaybeFlatten.java
index 837ba675ef..325c4db2ea 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/maybe/MaybeFlatten.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/maybe/MaybeFlatten.java
@@ -13,6 +13,7 @@
 
 package io.reactivex.rxjava3.internal.operators.maybe;
 
+import java.util.Objects;
 import java.util.concurrent.atomic.AtomicReference;
 
 import io.reactivex.rxjava3.core.*;
@@ -20,7 +21,6 @@
 import io.reactivex.rxjava3.exceptions.Exceptions;
 import io.reactivex.rxjava3.functions.Function;
 import io.reactivex.rxjava3.internal.disposables.DisposableHelper;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 
 /**
  * Maps a value into a MaybeSource and relays its signal.
@@ -85,7 +85,7 @@ public void onSuccess(T value) {
             MaybeSource<? extends R> source;
 
             try {
-                source = ObjectHelper.requireNonNull(mapper.apply(value), "The mapper returned a null MaybeSource");
+                source = Objects.requireNonNull(mapper.apply(value), "The mapper returned a null MaybeSource");
             } catch (Throwable ex) {
                 Exceptions.throwIfFatal(ex);
                 downstream.onError(ex);
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/maybe/MaybeLift.java b/src/main/java/io/reactivex/rxjava3/internal/operators/maybe/MaybeLift.java
index 38cb73972c..8e40bbd45d 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/maybe/MaybeLift.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/maybe/MaybeLift.java
@@ -16,7 +16,8 @@
 import io.reactivex.rxjava3.core.*;
 import io.reactivex.rxjava3.exceptions.Exceptions;
 import io.reactivex.rxjava3.internal.disposables.EmptyDisposable;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
+
+import java.util.Objects;
 
 /**
  * Calls a MaybeOperator for the incoming MaybeObserver.
@@ -38,7 +39,7 @@ protected void subscribeActual(MaybeObserver<? super R> observer) {
         MaybeObserver<? super T> lifted;
 
         try {
-            lifted = ObjectHelper.requireNonNull(operator.apply(observer), "The operator returned a null MaybeObserver");
+            lifted = Objects.requireNonNull(operator.apply(observer), "The operator returned a null MaybeObserver");
         } catch (Throwable ex) {
             Exceptions.throwIfFatal(ex);
             EmptyDisposable.error(ex, observer);
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/maybe/MaybeMap.java b/src/main/java/io/reactivex/rxjava3/internal/operators/maybe/MaybeMap.java
index c2a14f994d..167e21d7fb 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/maybe/MaybeMap.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/maybe/MaybeMap.java
@@ -18,7 +18,8 @@
 import io.reactivex.rxjava3.exceptions.Exceptions;
 import io.reactivex.rxjava3.functions.Function;
 import io.reactivex.rxjava3.internal.disposables.DisposableHelper;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
+
+import java.util.Objects;
 
 /**
  * Maps the upstream success value into some other value.
@@ -79,7 +80,7 @@ public void onSuccess(T value) {
             R v;
 
             try {
-                v = ObjectHelper.requireNonNull(mapper.apply(value), "The mapper returned a null item");
+                v = Objects.requireNonNull(mapper.apply(value), "The mapper returned a null item");
             } catch (Throwable ex) {
                 Exceptions.throwIfFatal(ex);
                 downstream.onError(ex);
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/maybe/MaybeMergeArray.java b/src/main/java/io/reactivex/rxjava3/internal/operators/maybe/MaybeMergeArray.java
index d5e5069d22..2910a2e803 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/maybe/MaybeMergeArray.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/maybe/MaybeMergeArray.java
@@ -13,6 +13,7 @@
 
 package io.reactivex.rxjava3.internal.operators.maybe;
 
+import java.util.Objects;
 import java.util.concurrent.ConcurrentLinkedQueue;
 import java.util.concurrent.atomic.*;
 
@@ -21,7 +22,6 @@
 import io.reactivex.rxjava3.annotations.Nullable;
 import io.reactivex.rxjava3.core.*;
 import io.reactivex.rxjava3.disposables.*;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.internal.fuseable.SimpleQueue;
 import io.reactivex.rxjava3.internal.subscriptions.*;
 import io.reactivex.rxjava3.internal.util.*;
@@ -327,7 +327,7 @@ static final class MpscFillOnceSimpleQueue<T>
 
         @Override
         public boolean offer(T value) {
-            ObjectHelper.requireNonNull(value, "value is null");
+            Objects.requireNonNull(value, "value is null");
             int idx = producerIndex.getAndIncrement();
             if (idx < length()) {
                 lazySet(idx, value);
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/maybe/MaybeOnErrorNext.java b/src/main/java/io/reactivex/rxjava3/internal/operators/maybe/MaybeOnErrorNext.java
index 15ec49c3a9..901016f39a 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/maybe/MaybeOnErrorNext.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/maybe/MaybeOnErrorNext.java
@@ -13,6 +13,7 @@
 
 package io.reactivex.rxjava3.internal.operators.maybe;
 
+import java.util.Objects;
 import java.util.concurrent.atomic.AtomicReference;
 
 import io.reactivex.rxjava3.core.*;
@@ -20,11 +21,10 @@
 import io.reactivex.rxjava3.exceptions.*;
 import io.reactivex.rxjava3.functions.Function;
 import io.reactivex.rxjava3.internal.disposables.DisposableHelper;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 
 /**
  * Subscribes to the MaybeSource returned by a function if the main source signals an onError.
- * 
+ *
  * @param <T> the value type
  */
 public final class MaybeOnErrorNext<T> extends AbstractMaybeWithUpstream<T, T> {
@@ -97,7 +97,7 @@ public void onError(Throwable e) {
             MaybeSource<? extends T> m;
 
             try {
-                m = ObjectHelper.requireNonNull(resumeFunction.apply(e), "The resumeFunction returned a null MaybeSource");
+                m = Objects.requireNonNull(resumeFunction.apply(e), "The resumeFunction returned a null MaybeSource");
             } catch (Throwable ex) {
                 Exceptions.throwIfFatal(ex);
                 downstream.onError(new CompositeException(e, ex));
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/maybe/MaybeOnErrorReturn.java b/src/main/java/io/reactivex/rxjava3/internal/operators/maybe/MaybeOnErrorReturn.java
index 5c61179678..c7ab7b8524 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/maybe/MaybeOnErrorReturn.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/maybe/MaybeOnErrorReturn.java
@@ -18,7 +18,8 @@
 import io.reactivex.rxjava3.exceptions.*;
 import io.reactivex.rxjava3.functions.Function;
 import io.reactivex.rxjava3.internal.disposables.DisposableHelper;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
+
+import java.util.Objects;
 
 /**
  * Returns a value generated via a function if the main source signals an onError.
@@ -82,7 +83,7 @@ public void onError(Throwable e) {
             T v;
 
             try {
-                v = ObjectHelper.requireNonNull(valueSupplier.apply(e), "The valueSupplier returned a null value");
+                v = Objects.requireNonNull(valueSupplier.apply(e), "The valueSupplier returned a null value");
             } catch (Throwable ex) {
                 Exceptions.throwIfFatal(ex);
                 downstream.onError(new CompositeException(e, ex));
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/maybe/MaybeUsing.java b/src/main/java/io/reactivex/rxjava3/internal/operators/maybe/MaybeUsing.java
index 628c4dda23..0e490d6f40 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/maybe/MaybeUsing.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/maybe/MaybeUsing.java
@@ -13,6 +13,7 @@
 
 package io.reactivex.rxjava3.internal.operators.maybe;
 
+import java.util.Objects;
 import java.util.concurrent.atomic.AtomicReference;
 
 import io.reactivex.rxjava3.core.*;
@@ -20,7 +21,6 @@
 import io.reactivex.rxjava3.exceptions.*;
 import io.reactivex.rxjava3.functions.*;
 import io.reactivex.rxjava3.internal.disposables.*;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.plugins.RxJavaPlugins;
 
 /**
@@ -65,7 +65,7 @@ protected void subscribeActual(MaybeObserver<? super T> observer) {
         MaybeSource<? extends T> source;
 
         try {
-            source = ObjectHelper.requireNonNull(sourceSupplier.apply(resource), "The sourceSupplier returned a null MaybeSource");
+            source = Objects.requireNonNull(sourceSupplier.apply(resource), "The sourceSupplier returned a null MaybeSource");
         } catch (Throwable ex) {
             Exceptions.throwIfFatal(ex);
             if (eager) {
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/maybe/MaybeZipArray.java b/src/main/java/io/reactivex/rxjava3/internal/operators/maybe/MaybeZipArray.java
index 9d83976966..d4bf3b0a77 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/maybe/MaybeZipArray.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/maybe/MaybeZipArray.java
@@ -13,6 +13,7 @@
 
 package io.reactivex.rxjava3.internal.operators.maybe;
 
+import java.util.Objects;
 import java.util.concurrent.atomic.*;
 
 import io.reactivex.rxjava3.core.*;
@@ -20,7 +21,6 @@
 import io.reactivex.rxjava3.exceptions.Exceptions;
 import io.reactivex.rxjava3.functions.Function;
 import io.reactivex.rxjava3.internal.disposables.DisposableHelper;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.plugins.RxJavaPlugins;
 
 public final class MaybeZipArray<T, R> extends Maybe<R> {
@@ -108,7 +108,7 @@ void innerSuccess(T value, int index) {
                 R v;
 
                 try {
-                    v = ObjectHelper.requireNonNull(zipper.apply(values), "The zipper returned a null value");
+                    v = Objects.requireNonNull(zipper.apply(values), "The zipper returned a null value");
                 } catch (Throwable ex) {
                     Exceptions.throwIfFatal(ex);
                     downstream.onError(ex);
@@ -190,7 +190,7 @@ public void onComplete() {
     final class SingletonArrayFunc implements Function<T, R> {
         @Override
         public R apply(T t) throws Throwable {
-            return ObjectHelper.requireNonNull(zipper.apply(new Object[] { t }), "The zipper returned a null value");
+            return Objects.requireNonNull(zipper.apply(new Object[] { t }), "The zipper returned a null value");
         }
     }
 }
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/maybe/MaybeZipIterable.java b/src/main/java/io/reactivex/rxjava3/internal/operators/maybe/MaybeZipIterable.java
index efcd10b136..7c2d85c97b 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/maybe/MaybeZipIterable.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/maybe/MaybeZipIterable.java
@@ -14,12 +14,12 @@
 package io.reactivex.rxjava3.internal.operators.maybe;
 
 import java.util.Arrays;
+import java.util.Objects;
 
 import io.reactivex.rxjava3.core.*;
 import io.reactivex.rxjava3.exceptions.Exceptions;
 import io.reactivex.rxjava3.functions.Function;
 import io.reactivex.rxjava3.internal.disposables.EmptyDisposable;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.internal.operators.maybe.MaybeZipArray.ZipCoordinator;
 
 public final class MaybeZipIterable<T, R> extends Maybe<R> {
@@ -82,7 +82,7 @@ protected void subscribeActual(MaybeObserver<? super R> observer) {
     final class SingletonArrayFunc implements Function<T, R> {
         @Override
         public R apply(T t) throws Throwable {
-            return ObjectHelper.requireNonNull(zipper.apply(new Object[] { t }), "The zipper returned a null value");
+            return Objects.requireNonNull(zipper.apply(new Object[] { t }), "The zipper returned a null value");
         }
     }
 }
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/mixed/FlowableConcatMapCompletable.java b/src/main/java/io/reactivex/rxjava3/internal/operators/mixed/FlowableConcatMapCompletable.java
index 6e16c9b6a9..986af99049 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/mixed/FlowableConcatMapCompletable.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/mixed/FlowableConcatMapCompletable.java
@@ -13,6 +13,7 @@
 
 package io.reactivex.rxjava3.internal.operators.mixed;
 
+import java.util.Objects;
 import java.util.concurrent.atomic.*;
 
 import org.reactivestreams.Subscription;
@@ -22,7 +23,6 @@
 import io.reactivex.rxjava3.exceptions.*;
 import io.reactivex.rxjava3.functions.Function;
 import io.reactivex.rxjava3.internal.disposables.DisposableHelper;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.internal.fuseable.SimplePlainQueue;
 import io.reactivex.rxjava3.internal.queue.SpscArrayQueue;
 import io.reactivex.rxjava3.internal.subscriptions.SubscriptionHelper;
@@ -223,7 +223,7 @@ void drain() {
                         CompletableSource cs;
 
                         try {
-                            cs = ObjectHelper.requireNonNull(mapper.apply(v), "The mapper returned a null CompletableSource");
+                            cs = Objects.requireNonNull(mapper.apply(v), "The mapper returned a null CompletableSource");
                         } catch (Throwable ex) {
                             Exceptions.throwIfFatal(ex);
                             queue.clear();
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/mixed/FlowableConcatMapMaybe.java b/src/main/java/io/reactivex/rxjava3/internal/operators/mixed/FlowableConcatMapMaybe.java
index 39fa04b174..cd8b9fa77f 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/mixed/FlowableConcatMapMaybe.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/mixed/FlowableConcatMapMaybe.java
@@ -13,6 +13,7 @@
 
 package io.reactivex.rxjava3.internal.operators.mixed;
 
+import java.util.Objects;
 import java.util.concurrent.atomic.*;
 
 import org.reactivestreams.*;
@@ -22,7 +23,6 @@
 import io.reactivex.rxjava3.exceptions.*;
 import io.reactivex.rxjava3.functions.Function;
 import io.reactivex.rxjava3.internal.disposables.DisposableHelper;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.internal.fuseable.SimplePlainQueue;
 import io.reactivex.rxjava3.internal.queue.SpscArrayQueue;
 import io.reactivex.rxjava3.internal.subscriptions.SubscriptionHelper;
@@ -251,7 +251,7 @@ void drain() {
                         MaybeSource<? extends R> ms;
 
                         try {
-                            ms = ObjectHelper.requireNonNull(mapper.apply(v), "The mapper returned a null MaybeSource");
+                            ms = Objects.requireNonNull(mapper.apply(v), "The mapper returned a null MaybeSource");
                         } catch (Throwable ex) {
                             Exceptions.throwIfFatal(ex);
                             upstream.cancel();
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/mixed/FlowableConcatMapSingle.java b/src/main/java/io/reactivex/rxjava3/internal/operators/mixed/FlowableConcatMapSingle.java
index cd5e857274..78334d4a1f 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/mixed/FlowableConcatMapSingle.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/mixed/FlowableConcatMapSingle.java
@@ -13,6 +13,7 @@
 
 package io.reactivex.rxjava3.internal.operators.mixed;
 
+import java.util.Objects;
 import java.util.concurrent.atomic.*;
 
 import org.reactivestreams.*;
@@ -22,7 +23,6 @@
 import io.reactivex.rxjava3.exceptions.*;
 import io.reactivex.rxjava3.functions.Function;
 import io.reactivex.rxjava3.internal.disposables.DisposableHelper;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.internal.fuseable.SimplePlainQueue;
 import io.reactivex.rxjava3.internal.queue.SpscArrayQueue;
 import io.reactivex.rxjava3.internal.subscriptions.SubscriptionHelper;
@@ -246,7 +246,7 @@ void drain() {
                         SingleSource<? extends R> ss;
 
                         try {
-                            ss = ObjectHelper.requireNonNull(mapper.apply(v), "The mapper returned a null SingleSource");
+                            ss = Objects.requireNonNull(mapper.apply(v), "The mapper returned a null SingleSource");
                         } catch (Throwable ex) {
                             Exceptions.throwIfFatal(ex);
                             upstream.cancel();
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/mixed/FlowableSwitchMapCompletable.java b/src/main/java/io/reactivex/rxjava3/internal/operators/mixed/FlowableSwitchMapCompletable.java
index f354d8f057..a2d66067ab 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/mixed/FlowableSwitchMapCompletable.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/mixed/FlowableSwitchMapCompletable.java
@@ -13,6 +13,7 @@
 
 package io.reactivex.rxjava3.internal.operators.mixed;
 
+import java.util.Objects;
 import java.util.concurrent.atomic.AtomicReference;
 
 import org.reactivestreams.Subscription;
@@ -22,7 +23,6 @@
 import io.reactivex.rxjava3.exceptions.Exceptions;
 import io.reactivex.rxjava3.functions.Function;
 import io.reactivex.rxjava3.internal.disposables.DisposableHelper;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.internal.subscriptions.SubscriptionHelper;
 import io.reactivex.rxjava3.internal.util.AtomicThrowable;
 import io.reactivex.rxjava3.plugins.RxJavaPlugins;
@@ -96,7 +96,7 @@ public void onNext(T t) {
             CompletableSource c;
 
             try {
-                c = ObjectHelper.requireNonNull(mapper.apply(t), "The mapper returned a null CompletableSource");
+                c = Objects.requireNonNull(mapper.apply(t), "The mapper returned a null CompletableSource");
             } catch (Throwable ex) {
                 Exceptions.throwIfFatal(ex);
                 upstream.cancel();
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/mixed/FlowableSwitchMapMaybe.java b/src/main/java/io/reactivex/rxjava3/internal/operators/mixed/FlowableSwitchMapMaybe.java
index 56858d5d22..11ea0a4c77 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/mixed/FlowableSwitchMapMaybe.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/mixed/FlowableSwitchMapMaybe.java
@@ -13,6 +13,7 @@
 
 package io.reactivex.rxjava3.internal.operators.mixed;
 
+import java.util.Objects;
 import java.util.concurrent.atomic.*;
 
 import org.reactivestreams.*;
@@ -22,7 +23,6 @@
 import io.reactivex.rxjava3.exceptions.Exceptions;
 import io.reactivex.rxjava3.functions.Function;
 import io.reactivex.rxjava3.internal.disposables.DisposableHelper;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.internal.subscriptions.SubscriptionHelper;
 import io.reactivex.rxjava3.internal.util.*;
 import io.reactivex.rxjava3.plugins.RxJavaPlugins;
@@ -116,7 +116,7 @@ public void onNext(T t) {
             MaybeSource<? extends R> ms;
 
             try {
-                ms = ObjectHelper.requireNonNull(mapper.apply(t), "The mapper returned a null MaybeSource");
+                ms = Objects.requireNonNull(mapper.apply(t), "The mapper returned a null MaybeSource");
             } catch (Throwable ex) {
                 Exceptions.throwIfFatal(ex);
                 upstream.cancel();
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/mixed/FlowableSwitchMapSingle.java b/src/main/java/io/reactivex/rxjava3/internal/operators/mixed/FlowableSwitchMapSingle.java
index ac0880082b..c41b52f6e5 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/mixed/FlowableSwitchMapSingle.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/mixed/FlowableSwitchMapSingle.java
@@ -13,6 +13,7 @@
 
 package io.reactivex.rxjava3.internal.operators.mixed;
 
+import java.util.Objects;
 import java.util.concurrent.atomic.*;
 
 import org.reactivestreams.*;
@@ -22,7 +23,6 @@
 import io.reactivex.rxjava3.exceptions.Exceptions;
 import io.reactivex.rxjava3.functions.Function;
 import io.reactivex.rxjava3.internal.disposables.DisposableHelper;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.internal.subscriptions.SubscriptionHelper;
 import io.reactivex.rxjava3.internal.util.*;
 import io.reactivex.rxjava3.plugins.RxJavaPlugins;
@@ -116,7 +116,7 @@ public void onNext(T t) {
             SingleSource<? extends R> ss;
 
             try {
-                ss = ObjectHelper.requireNonNull(mapper.apply(t), "The mapper returned a null SingleSource");
+                ss = Objects.requireNonNull(mapper.apply(t), "The mapper returned a null SingleSource");
             } catch (Throwable ex) {
                 Exceptions.throwIfFatal(ex);
                 upstream.cancel();
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/mixed/MaybeFlatMapObservable.java b/src/main/java/io/reactivex/rxjava3/internal/operators/mixed/MaybeFlatMapObservable.java
index a4dde1242f..891c2a0f33 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/mixed/MaybeFlatMapObservable.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/mixed/MaybeFlatMapObservable.java
@@ -13,6 +13,7 @@
 
 package io.reactivex.rxjava3.internal.operators.mixed;
 
+import java.util.Objects;
 import java.util.concurrent.atomic.AtomicReference;
 
 import io.reactivex.rxjava3.core.*;
@@ -20,12 +21,11 @@
 import io.reactivex.rxjava3.exceptions.Exceptions;
 import io.reactivex.rxjava3.functions.Function;
 import io.reactivex.rxjava3.internal.disposables.DisposableHelper;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 
 /**
  * Maps the success value of a Maybe onto an ObservableSource and
  * relays its signals to the downstream observer.
- * 
+ *
  * @param <T> the success value type of the Maybe source
  * @param <R> the result type of the ObservableSource and this operator
  * @since 2.1.15
@@ -99,7 +99,7 @@ public void onSuccess(T t) {
             ObservableSource<? extends R> o;
 
             try {
-                o = ObjectHelper.requireNonNull(mapper.apply(t), "The mapper returned a null Publisher");
+                o = Objects.requireNonNull(mapper.apply(t), "The mapper returned a null Publisher");
             } catch (Throwable ex) {
                 Exceptions.throwIfFatal(ex);
                 downstream.onError(ex);
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/mixed/MaybeFlatMapPublisher.java b/src/main/java/io/reactivex/rxjava3/internal/operators/mixed/MaybeFlatMapPublisher.java
index 66a446f3f3..1ac179bcca 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/mixed/MaybeFlatMapPublisher.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/mixed/MaybeFlatMapPublisher.java
@@ -13,6 +13,7 @@
 
 package io.reactivex.rxjava3.internal.operators.mixed;
 
+import java.util.Objects;
 import java.util.concurrent.atomic.*;
 
 import org.reactivestreams.*;
@@ -22,13 +23,12 @@
 import io.reactivex.rxjava3.exceptions.Exceptions;
 import io.reactivex.rxjava3.functions.Function;
 import io.reactivex.rxjava3.internal.disposables.DisposableHelper;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.internal.subscriptions.SubscriptionHelper;
 
 /**
  * Maps the success value of a Maybe onto a Publisher and
  * relays its signals to the downstream subscriber.
- * 
+ *
  * @param <T> the success value type of the Maybe source
  * @param <R> the result type of the Publisher and this operator
  * @since 2.1.15
@@ -109,7 +109,7 @@ public void onSuccess(T t) {
             Publisher<? extends R> p;
 
             try {
-                p = ObjectHelper.requireNonNull(mapper.apply(t), "The mapper returned a null Publisher");
+                p = Objects.requireNonNull(mapper.apply(t), "The mapper returned a null Publisher");
             } catch (Throwable ex) {
                 Exceptions.throwIfFatal(ex);
                 downstream.onError(ex);
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/mixed/ObservableConcatMapCompletable.java b/src/main/java/io/reactivex/rxjava3/internal/operators/mixed/ObservableConcatMapCompletable.java
index 4921722b5d..44f322e39d 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/mixed/ObservableConcatMapCompletable.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/mixed/ObservableConcatMapCompletable.java
@@ -13,6 +13,7 @@
 
 package io.reactivex.rxjava3.internal.operators.mixed;
 
+import java.util.Objects;
 import java.util.concurrent.atomic.*;
 
 import io.reactivex.rxjava3.core.*;
@@ -20,7 +21,6 @@
 import io.reactivex.rxjava3.exceptions.Exceptions;
 import io.reactivex.rxjava3.functions.Function;
 import io.reactivex.rxjava3.internal.disposables.DisposableHelper;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.internal.fuseable.*;
 import io.reactivex.rxjava3.internal.queue.SpscLinkedArrayQueue;
 import io.reactivex.rxjava3.internal.util.*;
@@ -224,7 +224,7 @@ void drain() {
                     try {
                         T v = queue.poll();
                         if (v != null) {
-                            cs = ObjectHelper.requireNonNull(mapper.apply(v), "The mapper returned a null CompletableSource");
+                            cs = Objects.requireNonNull(mapper.apply(v), "The mapper returned a null CompletableSource");
                             empty = false;
                         }
                     } catch (Throwable ex) {
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/mixed/ObservableConcatMapMaybe.java b/src/main/java/io/reactivex/rxjava3/internal/operators/mixed/ObservableConcatMapMaybe.java
index 17e4de9050..c76b0115cb 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/mixed/ObservableConcatMapMaybe.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/mixed/ObservableConcatMapMaybe.java
@@ -13,6 +13,7 @@
 
 package io.reactivex.rxjava3.internal.operators.mixed;
 
+import java.util.Objects;
 import java.util.concurrent.atomic.*;
 
 import io.reactivex.rxjava3.core.*;
@@ -20,7 +21,6 @@
 import io.reactivex.rxjava3.exceptions.Exceptions;
 import io.reactivex.rxjava3.functions.Function;
 import io.reactivex.rxjava3.internal.disposables.DisposableHelper;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.internal.fuseable.SimplePlainQueue;
 import io.reactivex.rxjava3.internal.queue.SpscLinkedArrayQueue;
 import io.reactivex.rxjava3.internal.util.*;
@@ -224,7 +224,7 @@ void drain() {
                         MaybeSource<? extends R> ms;
 
                         try {
-                            ms = ObjectHelper.requireNonNull(mapper.apply(v), "The mapper returned a null MaybeSource");
+                            ms = Objects.requireNonNull(mapper.apply(v), "The mapper returned a null MaybeSource");
                         } catch (Throwable ex) {
                             Exceptions.throwIfFatal(ex);
                             upstream.dispose();
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/mixed/ObservableConcatMapSingle.java b/src/main/java/io/reactivex/rxjava3/internal/operators/mixed/ObservableConcatMapSingle.java
index 91428a80db..34d7d04734 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/mixed/ObservableConcatMapSingle.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/mixed/ObservableConcatMapSingle.java
@@ -13,6 +13,7 @@
 
 package io.reactivex.rxjava3.internal.operators.mixed;
 
+import java.util.Objects;
 import java.util.concurrent.atomic.*;
 
 import io.reactivex.rxjava3.core.*;
@@ -20,7 +21,6 @@
 import io.reactivex.rxjava3.exceptions.Exceptions;
 import io.reactivex.rxjava3.functions.Function;
 import io.reactivex.rxjava3.internal.disposables.DisposableHelper;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.internal.fuseable.SimplePlainQueue;
 import io.reactivex.rxjava3.internal.queue.SpscLinkedArrayQueue;
 import io.reactivex.rxjava3.internal.util.*;
@@ -219,7 +219,7 @@ void drain() {
                         SingleSource<? extends R> ss;
 
                         try {
-                            ss = ObjectHelper.requireNonNull(mapper.apply(v), "The mapper returned a null SingleSource");
+                            ss = Objects.requireNonNull(mapper.apply(v), "The mapper returned a null SingleSource");
                         } catch (Throwable ex) {
                             Exceptions.throwIfFatal(ex);
                             upstream.dispose();
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/mixed/ObservableSwitchMapCompletable.java b/src/main/java/io/reactivex/rxjava3/internal/operators/mixed/ObservableSwitchMapCompletable.java
index 06a09676d0..a7a6a7fd99 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/mixed/ObservableSwitchMapCompletable.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/mixed/ObservableSwitchMapCompletable.java
@@ -13,6 +13,7 @@
 
 package io.reactivex.rxjava3.internal.operators.mixed;
 
+import java.util.Objects;
 import java.util.concurrent.atomic.AtomicReference;
 
 import io.reactivex.rxjava3.core.*;
@@ -20,7 +21,6 @@
 import io.reactivex.rxjava3.exceptions.Exceptions;
 import io.reactivex.rxjava3.functions.Function;
 import io.reactivex.rxjava3.internal.disposables.DisposableHelper;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.internal.util.AtomicThrowable;
 import io.reactivex.rxjava3.plugins.RxJavaPlugins;
 
@@ -94,7 +94,7 @@ public void onNext(T t) {
             CompletableSource c;
 
             try {
-                c = ObjectHelper.requireNonNull(mapper.apply(t), "The mapper returned a null CompletableSource");
+                c = Objects.requireNonNull(mapper.apply(t), "The mapper returned a null CompletableSource");
             } catch (Throwable ex) {
                 Exceptions.throwIfFatal(ex);
                 upstream.dispose();
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/mixed/ObservableSwitchMapMaybe.java b/src/main/java/io/reactivex/rxjava3/internal/operators/mixed/ObservableSwitchMapMaybe.java
index b85bc0e2c2..bf3c9f43c2 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/mixed/ObservableSwitchMapMaybe.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/mixed/ObservableSwitchMapMaybe.java
@@ -13,6 +13,7 @@
 
 package io.reactivex.rxjava3.internal.operators.mixed;
 
+import java.util.Objects;
 import java.util.concurrent.atomic.*;
 
 import io.reactivex.rxjava3.core.*;
@@ -20,7 +21,6 @@
 import io.reactivex.rxjava3.exceptions.Exceptions;
 import io.reactivex.rxjava3.functions.Function;
 import io.reactivex.rxjava3.internal.disposables.DisposableHelper;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.internal.util.AtomicThrowable;
 import io.reactivex.rxjava3.plugins.RxJavaPlugins;
 
@@ -109,7 +109,7 @@ public void onNext(T t) {
             MaybeSource<? extends R> ms;
 
             try {
-                ms = ObjectHelper.requireNonNull(mapper.apply(t), "The mapper returned a null MaybeSource");
+                ms = Objects.requireNonNull(mapper.apply(t), "The mapper returned a null MaybeSource");
             } catch (Throwable ex) {
                 Exceptions.throwIfFatal(ex);
                 upstream.dispose();
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/mixed/ObservableSwitchMapSingle.java b/src/main/java/io/reactivex/rxjava3/internal/operators/mixed/ObservableSwitchMapSingle.java
index 3343f93d97..bc19c88b55 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/mixed/ObservableSwitchMapSingle.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/mixed/ObservableSwitchMapSingle.java
@@ -13,6 +13,7 @@
 
 package io.reactivex.rxjava3.internal.operators.mixed;
 
+import java.util.Objects;
 import java.util.concurrent.atomic.*;
 
 import io.reactivex.rxjava3.core.*;
@@ -20,7 +21,6 @@
 import io.reactivex.rxjava3.exceptions.Exceptions;
 import io.reactivex.rxjava3.functions.Function;
 import io.reactivex.rxjava3.internal.disposables.DisposableHelper;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.internal.util.AtomicThrowable;
 import io.reactivex.rxjava3.plugins.RxJavaPlugins;
 
@@ -109,7 +109,7 @@ public void onNext(T t) {
             SingleSource<? extends R> ss;
 
             try {
-                ss = ObjectHelper.requireNonNull(mapper.apply(t), "The mapper returned a null SingleSource");
+                ss = Objects.requireNonNull(mapper.apply(t), "The mapper returned a null SingleSource");
             } catch (Throwable ex) {
                 Exceptions.throwIfFatal(ex);
                 upstream.dispose();
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/mixed/ScalarXMapZHelper.java b/src/main/java/io/reactivex/rxjava3/internal/operators/mixed/ScalarXMapZHelper.java
index 24f231e45c..d7fe0e3445 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/mixed/ScalarXMapZHelper.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/mixed/ScalarXMapZHelper.java
@@ -17,10 +17,11 @@
 import io.reactivex.rxjava3.exceptions.Exceptions;
 import io.reactivex.rxjava3.functions.*;
 import io.reactivex.rxjava3.internal.disposables.EmptyDisposable;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.internal.operators.maybe.MaybeToObservable;
 import io.reactivex.rxjava3.internal.operators.single.SingleToObservable;
 
+import java.util.Objects;
+
 /**
  * Utility class to extract a value from a scalar source reactive type,
  * map it to a 0-1 type then subscribe the output type's consumer to it,
@@ -55,7 +56,7 @@ static <T> boolean tryAsCompletable(Object source,
             try {
                 T item = supplier.get();
                 if (item != null) {
-                    cs = ObjectHelper.requireNonNull(mapper.apply(item), "The mapper returned a null CompletableSource");
+                    cs = Objects.requireNonNull(mapper.apply(item), "The mapper returned a null CompletableSource");
                 }
             } catch (Throwable ex) {
                 Exceptions.throwIfFatal(ex);
@@ -94,7 +95,7 @@ static <T, R> boolean tryAsMaybe(Object source,
             try {
                 T item = supplier.get();
                 if (item != null) {
-                    cs = ObjectHelper.requireNonNull(mapper.apply(item), "The mapper returned a null MaybeSource");
+                    cs = Objects.requireNonNull(mapper.apply(item), "The mapper returned a null MaybeSource");
                 }
             } catch (Throwable ex) {
                 Exceptions.throwIfFatal(ex);
@@ -133,7 +134,7 @@ static <T, R> boolean tryAsSingle(Object source,
             try {
                 T item = supplier.get();
                 if (item != null) {
-                    cs = ObjectHelper.requireNonNull(mapper.apply(item), "The mapper returned a null SingleSource");
+                    cs = Objects.requireNonNull(mapper.apply(item), "The mapper returned a null SingleSource");
                 }
             } catch (Throwable ex) {
                 Exceptions.throwIfFatal(ex);
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/mixed/SingleFlatMapObservable.java b/src/main/java/io/reactivex/rxjava3/internal/operators/mixed/SingleFlatMapObservable.java
index 9591783a8e..bfb466bac1 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/mixed/SingleFlatMapObservable.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/mixed/SingleFlatMapObservable.java
@@ -13,6 +13,7 @@
 
 package io.reactivex.rxjava3.internal.operators.mixed;
 
+import java.util.Objects;
 import java.util.concurrent.atomic.AtomicReference;
 
 import io.reactivex.rxjava3.core.*;
@@ -20,12 +21,11 @@
 import io.reactivex.rxjava3.exceptions.Exceptions;
 import io.reactivex.rxjava3.functions.Function;
 import io.reactivex.rxjava3.internal.disposables.DisposableHelper;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 
 /**
  * Maps the success value of a Single onto an ObservableSource and
  * relays its signals to the downstream observer.
- * 
+ *
  * @param <T> the success value type of the Single source
  * @param <R> the result type of the ObservableSource and this operator
  * @since 2.1.15
@@ -99,7 +99,7 @@ public void onSuccess(T t) {
             ObservableSource<? extends R> o;
 
             try {
-                o = ObjectHelper.requireNonNull(mapper.apply(t), "The mapper returned a null Publisher");
+                o = Objects.requireNonNull(mapper.apply(t), "The mapper returned a null Publisher");
             } catch (Throwable ex) {
                 Exceptions.throwIfFatal(ex);
                 downstream.onError(ex);
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableBlockingSubscribe.java b/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableBlockingSubscribe.java
index c35f927c0b..c02bcfca88 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableBlockingSubscribe.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableBlockingSubscribe.java
@@ -13,6 +13,7 @@
 
 package io.reactivex.rxjava3.internal.operators.observable;
 
+import java.util.Objects;
 import java.util.concurrent.*;
 
 import io.reactivex.rxjava3.core.*;
@@ -97,9 +98,9 @@ public static <T> void subscribe(ObservableSource<? extends T> o) {
      */
     public static <T> void subscribe(ObservableSource<? extends T> o, final Consumer<? super T> onNext,
             final Consumer<? super Throwable> onError, final Action onComplete) {
-        ObjectHelper.requireNonNull(onNext, "onNext is null");
-        ObjectHelper.requireNonNull(onError, "onError is null");
-        ObjectHelper.requireNonNull(onComplete, "onComplete is null");
+        Objects.requireNonNull(onNext, "onNext is null");
+        Objects.requireNonNull(onError, "onError is null");
+        Objects.requireNonNull(onComplete, "onComplete is null");
         subscribe(o, new LambdaObserver<T>(onNext, onError, onComplete, Functions.emptyConsumer()));
     }
 }
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableBuffer.java b/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableBuffer.java
index d0ae0b89cc..2b09748a61 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableBuffer.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableBuffer.java
@@ -22,7 +22,6 @@
 import io.reactivex.rxjava3.exceptions.Exceptions;
 import io.reactivex.rxjava3.functions.Supplier;
 import io.reactivex.rxjava3.internal.disposables.*;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.internal.util.ExceptionHelper;
 
 public final class ObservableBuffer<T, U extends Collection<? super T>> extends AbstractObservableWithUpstream<T, U> {
@@ -68,7 +67,7 @@ static final class BufferExactObserver<T, U extends Collection<? super T>> imple
         boolean createBuffer() {
             U b;
             try {
-                b = ObjectHelper.requireNonNull(bufferSupplier.get(), "Empty buffer supplied");
+                b = Objects.requireNonNull(bufferSupplier.get(), "Empty buffer supplied");
             } catch (Throwable t) {
                 Exceptions.throwIfFatal(t);
                 buffer = null;
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableBufferBoundary.java b/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableBufferBoundary.java
index 961c6cd374..cef9ef41d8 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableBufferBoundary.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableBufferBoundary.java
@@ -22,7 +22,6 @@
 import io.reactivex.rxjava3.exceptions.Exceptions;
 import io.reactivex.rxjava3.functions.*;
 import io.reactivex.rxjava3.internal.disposables.DisposableHelper;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.internal.queue.SpscLinkedArrayQueue;
 import io.reactivex.rxjava3.internal.util.AtomicThrowable;
 import io.reactivex.rxjava3.plugins.RxJavaPlugins;
@@ -172,8 +171,8 @@ void open(Open token) {
             ObservableSource<? extends Close> p;
             C buf;
             try {
-                buf = ObjectHelper.requireNonNull(bufferSupplier.get(), "The bufferSupplier returned a null Collection");
-                p = ObjectHelper.requireNonNull(bufferClose.apply(token), "The bufferClose returned a null ObservableSource");
+                buf = Objects.requireNonNull(bufferSupplier.get(), "The bufferSupplier returned a null Collection");
+                p = Objects.requireNonNull(bufferClose.apply(token), "The bufferClose returned a null ObservableSource");
             } catch (Throwable ex) {
                 Exceptions.throwIfFatal(ex);
                 DisposableHelper.dispose(upstream);
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableBufferExactBoundary.java b/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableBufferExactBoundary.java
index 474e993653..7d76354cf9 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableBufferExactBoundary.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableBufferExactBoundary.java
@@ -14,13 +14,13 @@
 package io.reactivex.rxjava3.internal.operators.observable;
 
 import java.util.Collection;
+import java.util.Objects;
 
 import io.reactivex.rxjava3.core.*;
 import io.reactivex.rxjava3.disposables.Disposable;
 import io.reactivex.rxjava3.exceptions.Exceptions;
 import io.reactivex.rxjava3.functions.Supplier;
 import io.reactivex.rxjava3.internal.disposables.*;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.internal.observers.QueueDrainObserver;
 import io.reactivex.rxjava3.internal.queue.MpscLinkedQueue;
 import io.reactivex.rxjava3.internal.util.QueueDrainHelper;
@@ -69,7 +69,7 @@ public void onSubscribe(Disposable d) {
                 U b;
 
                 try {
-                    b = ObjectHelper.requireNonNull(bufferSupplier.get(), "The buffer supplied is null");
+                    b = Objects.requireNonNull(bufferSupplier.get(), "The buffer supplied is null");
                 } catch (Throwable e) {
                     Exceptions.throwIfFatal(e);
                     cancelled = true;
@@ -148,7 +148,7 @@ void next() {
             U next;
 
             try {
-                next = ObjectHelper.requireNonNull(bufferSupplier.get(), "The buffer supplied is null");
+                next = Objects.requireNonNull(bufferSupplier.get(), "The buffer supplied is null");
             } catch (Throwable e) {
                 Exceptions.throwIfFatal(e);
                 dispose();
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableBufferTimed.java b/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableBufferTimed.java
index 107b011b2d..3b12c3d0f5 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableBufferTimed.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableBufferTimed.java
@@ -24,7 +24,6 @@
 import io.reactivex.rxjava3.exceptions.Exceptions;
 import io.reactivex.rxjava3.functions.Supplier;
 import io.reactivex.rxjava3.internal.disposables.*;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.internal.observers.QueueDrainObserver;
 import io.reactivex.rxjava3.internal.queue.MpscLinkedQueue;
 import io.reactivex.rxjava3.internal.util.QueueDrainHelper;
@@ -110,7 +109,7 @@ public void onSubscribe(Disposable d) {
                 U b;
 
                 try {
-                    b = ObjectHelper.requireNonNull(bufferSupplier.get(), "The buffer supplied is null");
+                    b = Objects.requireNonNull(bufferSupplier.get(), "The buffer supplied is null");
                 } catch (Throwable e) {
                     Exceptions.throwIfFatal(e);
                     dispose();
@@ -184,7 +183,7 @@ public void run() {
             U next;
 
             try {
-                next = ObjectHelper.requireNonNull(bufferSupplier.get(), "The bufferSupplier returned a null buffer");
+                next = Objects.requireNonNull(bufferSupplier.get(), "The bufferSupplier returned a null buffer");
             } catch (Throwable e) {
                 Exceptions.throwIfFatal(e);
                 downstream.onError(e);
@@ -246,7 +245,7 @@ public void onSubscribe(Disposable d) {
                 final U b; // NOPMD
 
                 try {
-                    b = ObjectHelper.requireNonNull(bufferSupplier.get(), "The buffer supplied is null");
+                    b = Objects.requireNonNull(bufferSupplier.get(), "The buffer supplied is null");
                 } catch (Throwable e) {
                     Exceptions.throwIfFatal(e);
                     d.dispose();
@@ -328,7 +327,7 @@ public void run() {
             final U b; // NOPMD
 
             try {
-                b = ObjectHelper.requireNonNull(bufferSupplier.get(), "The bufferSupplier returned a null buffer");
+                b = Objects.requireNonNull(bufferSupplier.get(), "The bufferSupplier returned a null buffer");
             } catch (Throwable e) {
                 Exceptions.throwIfFatal(e);
                 downstream.onError(e);
@@ -427,7 +426,7 @@ public void onSubscribe(Disposable d) {
                 U b;
 
                 try {
-                    b = ObjectHelper.requireNonNull(bufferSupplier.get(), "The buffer supplied is null");
+                    b = Objects.requireNonNull(bufferSupplier.get(), "The buffer supplied is null");
                 } catch (Throwable e) {
                     Exceptions.throwIfFatal(e);
                     d.dispose();
@@ -469,7 +468,7 @@ public void onNext(T t) {
             fastPathOrderedEmit(b, false, this);
 
             try {
-                b = ObjectHelper.requireNonNull(bufferSupplier.get(), "The buffer supplied is null");
+                b = Objects.requireNonNull(bufferSupplier.get(), "The buffer supplied is null");
             } catch (Throwable e) {
                 Exceptions.throwIfFatal(e);
                 downstream.onError(e);
@@ -541,7 +540,7 @@ public void run() {
             U next;
 
             try {
-                next = ObjectHelper.requireNonNull(bufferSupplier.get(), "The bufferSupplier returned a null buffer");
+                next = Objects.requireNonNull(bufferSupplier.get(), "The bufferSupplier returned a null buffer");
             } catch (Throwable e) {
                 Exceptions.throwIfFatal(e);
                 dispose();
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableCollect.java b/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableCollect.java
index 3b81a32ad9..6471d7538c 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableCollect.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableCollect.java
@@ -16,9 +16,10 @@
 import io.reactivex.rxjava3.disposables.Disposable;
 import io.reactivex.rxjava3.functions.*;
 import io.reactivex.rxjava3.internal.disposables.*;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.plugins.RxJavaPlugins;
 
+import java.util.Objects;
+
 public final class ObservableCollect<T, U> extends AbstractObservableWithUpstream<T, U> {
     final Supplier<? extends U> initialSupplier;
     final BiConsumer<? super U, ? super T> collector;
@@ -34,7 +35,7 @@ public ObservableCollect(ObservableSource<T> source,
     protected void subscribeActual(Observer<? super U> t) {
         U u;
         try {
-            u = ObjectHelper.requireNonNull(initialSupplier.get(), "The initialSupplier returned a null value");
+            u = Objects.requireNonNull(initialSupplier.get(), "The initialSupplier returned a null value");
         } catch (Throwable e) {
             EmptyDisposable.error(e, t);
             return;
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableCollectSingle.java b/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableCollectSingle.java
index a63812a9ab..09c86cb24a 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableCollectSingle.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableCollectSingle.java
@@ -16,10 +16,11 @@
 import io.reactivex.rxjava3.disposables.Disposable;
 import io.reactivex.rxjava3.functions.*;
 import io.reactivex.rxjava3.internal.disposables.*;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.internal.fuseable.FuseToObservable;
 import io.reactivex.rxjava3.plugins.RxJavaPlugins;
 
+import java.util.Objects;
+
 public final class ObservableCollectSingle<T, U> extends Single<U> implements FuseToObservable<U> {
 
     final ObservableSource<T> source;
@@ -38,7 +39,7 @@ public ObservableCollectSingle(ObservableSource<T> source,
     protected void subscribeActual(SingleObserver<? super U> t) {
         U u;
         try {
-            u = ObjectHelper.requireNonNull(initialSupplier.get(), "The initialSupplier returned a null value");
+            u = Objects.requireNonNull(initialSupplier.get(), "The initialSupplier returned a null value");
         } catch (Throwable e) {
             EmptyDisposable.error(e, t);
             return;
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableCombineLatest.java b/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableCombineLatest.java
index 6a379d142c..0cc8e3e45e 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableCombineLatest.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableCombineLatest.java
@@ -13,6 +13,7 @@
 
 package io.reactivex.rxjava3.internal.operators.observable;
 
+import java.util.Objects;
 import java.util.concurrent.atomic.*;
 
 import io.reactivex.rxjava3.core.*;
@@ -20,7 +21,6 @@
 import io.reactivex.rxjava3.exceptions.Exceptions;
 import io.reactivex.rxjava3.functions.Function;
 import io.reactivex.rxjava3.internal.disposables.*;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.internal.queue.SpscLinkedArrayQueue;
 import io.reactivex.rxjava3.internal.util.AtomicThrowable;
 
@@ -188,7 +188,7 @@ void drain() {
                     R v;
 
                     try {
-                        v = ObjectHelper.requireNonNull(combiner.apply(s), "The combiner returned a null value");
+                        v = Objects.requireNonNull(combiner.apply(s), "The combiner returned a null value");
                     } catch (Throwable ex) {
                         Exceptions.throwIfFatal(ex);
                         errors.tryAddThrowableOrReport(ex);
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableConcatMap.java b/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableConcatMap.java
index 665306db95..b96b1ec8a0 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableConcatMap.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableConcatMap.java
@@ -12,6 +12,7 @@
  */
 package io.reactivex.rxjava3.internal.operators.observable;
 
+import java.util.Objects;
 import java.util.concurrent.atomic.*;
 
 import io.reactivex.rxjava3.core.*;
@@ -19,7 +20,6 @@
 import io.reactivex.rxjava3.exceptions.Exceptions;
 import io.reactivex.rxjava3.functions.*;
 import io.reactivex.rxjava3.internal.disposables.DisposableHelper;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.internal.fuseable.*;
 import io.reactivex.rxjava3.internal.queue.SpscLinkedArrayQueue;
 import io.reactivex.rxjava3.internal.util.*;
@@ -208,7 +208,7 @@ void drain() {
                         ObservableSource<? extends U> o;
 
                         try {
-                            o = ObjectHelper.requireNonNull(mapper.apply(t), "The mapper returned a null ObservableSource");
+                            o = Objects.requireNonNull(mapper.apply(t), "The mapper returned a null ObservableSource");
                         } catch (Throwable ex) {
                             Exceptions.throwIfFatal(ex);
                             dispose();
@@ -436,7 +436,7 @@ void drain() {
                         ObservableSource<? extends R> o;
 
                         try {
-                            o = ObjectHelper.requireNonNull(mapper.apply(v), "The mapper returned a null ObservableSource");
+                            o = Objects.requireNonNull(mapper.apply(v), "The mapper returned a null ObservableSource");
                         } catch (Throwable ex) {
                             Exceptions.throwIfFatal(ex);
                             cancelled = true;
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableConcatMapEager.java b/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableConcatMapEager.java
index 47c4099b83..fe2bed8c8c 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableConcatMapEager.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableConcatMapEager.java
@@ -14,6 +14,7 @@
 package io.reactivex.rxjava3.internal.operators.observable;
 
 import java.util.ArrayDeque;
+import java.util.Objects;
 import java.util.concurrent.atomic.AtomicInteger;
 
 import io.reactivex.rxjava3.core.*;
@@ -21,7 +22,6 @@
 import io.reactivex.rxjava3.exceptions.Exceptions;
 import io.reactivex.rxjava3.functions.Function;
 import io.reactivex.rxjava3.internal.disposables.DisposableHelper;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.internal.fuseable.*;
 import io.reactivex.rxjava3.internal.observers.*;
 import io.reactivex.rxjava3.internal.queue.SpscLinkedArrayQueue;
@@ -271,7 +271,7 @@ public void drain() {
                             break;
                         }
 
-                        source = ObjectHelper.requireNonNull(mapper.apply(v), "The mapper returned a null ObservableSource");
+                        source = Objects.requireNonNull(mapper.apply(v), "The mapper returned a null ObservableSource");
                     } catch (Throwable ex) {
                         Exceptions.throwIfFatal(ex);
                         upstream.dispose();
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableConcatMapScheduler.java b/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableConcatMapScheduler.java
index efe4b79fc6..f45dd92f1f 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableConcatMapScheduler.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableConcatMapScheduler.java
@@ -12,6 +12,7 @@
  */
 package io.reactivex.rxjava3.internal.operators.observable;
 
+import java.util.Objects;
 import java.util.concurrent.atomic.*;
 
 import io.reactivex.rxjava3.core.*;
@@ -19,7 +20,6 @@
 import io.reactivex.rxjava3.exceptions.Exceptions;
 import io.reactivex.rxjava3.functions.*;
 import io.reactivex.rxjava3.internal.disposables.DisposableHelper;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.internal.fuseable.*;
 import io.reactivex.rxjava3.internal.queue.SpscLinkedArrayQueue;
 import io.reactivex.rxjava3.internal.util.*;
@@ -218,7 +218,7 @@ public void run() {
                         ObservableSource<? extends U> o;
 
                         try {
-                            o = ObjectHelper.requireNonNull(mapper.apply(t), "The mapper returned a null ObservableSource");
+                            o = Objects.requireNonNull(mapper.apply(t), "The mapper returned a null ObservableSource");
                         } catch (Throwable ex) {
                             Exceptions.throwIfFatal(ex);
                             dispose();
@@ -459,7 +459,7 @@ public void run() {
                         ObservableSource<? extends R> o;
 
                         try {
-                            o = ObjectHelper.requireNonNull(mapper.apply(v), "The mapper returned a null ObservableSource");
+                            o = Objects.requireNonNull(mapper.apply(v), "The mapper returned a null ObservableSource");
                         } catch (Throwable ex) {
                             Exceptions.throwIfFatal(ex);
                             cancelled = true;
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableDebounce.java b/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableDebounce.java
index d2e1f8cf18..20f98731c1 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableDebounce.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableDebounce.java
@@ -13,6 +13,7 @@
 
 package io.reactivex.rxjava3.internal.operators.observable;
 
+import java.util.Objects;
 import java.util.concurrent.atomic.*;
 
 import io.reactivex.rxjava3.core.*;
@@ -20,7 +21,6 @@
 import io.reactivex.rxjava3.exceptions.Exceptions;
 import io.reactivex.rxjava3.functions.Function;
 import io.reactivex.rxjava3.internal.disposables.DisposableHelper;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.observers.*;
 import io.reactivex.rxjava3.plugins.RxJavaPlugins;
 
@@ -81,7 +81,7 @@ public void onNext(T t) {
             ObservableSource<U> p;
 
             try {
-                p = ObjectHelper.requireNonNull(debounceSelector.apply(t), "The ObservableSource supplied is null");
+                p = Objects.requireNonNull(debounceSelector.apply(t), "The ObservableSource supplied is null");
             } catch (Throwable e) {
                 Exceptions.throwIfFatal(e);
                 dispose();
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableDefer.java b/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableDefer.java
index c1f8dc41ab..15b3394af7 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableDefer.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableDefer.java
@@ -17,7 +17,8 @@
 import io.reactivex.rxjava3.exceptions.Exceptions;
 import io.reactivex.rxjava3.functions.Supplier;
 import io.reactivex.rxjava3.internal.disposables.EmptyDisposable;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
+
+import java.util.Objects;
 
 public final class ObservableDefer<T> extends Observable<T> {
     final Supplier<? extends ObservableSource<? extends T>> supplier;
@@ -29,7 +30,7 @@ public ObservableDefer(Supplier<? extends ObservableSource<? extends T>> supplie
     public void subscribeActual(Observer<? super T> observer) {
         ObservableSource<? extends T> pub;
         try {
-            pub = ObjectHelper.requireNonNull(supplier.get(), "The supplier returned a null ObservableSource");
+            pub = Objects.requireNonNull(supplier.get(), "The supplier returned a null ObservableSource");
         } catch (Throwable t) {
             Exceptions.throwIfFatal(t);
             EmptyDisposable.error(t, observer);
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableDematerialize.java b/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableDematerialize.java
index 59da21cd47..45b42e1ecc 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableDematerialize.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableDematerialize.java
@@ -18,9 +18,10 @@
 import io.reactivex.rxjava3.exceptions.Exceptions;
 import io.reactivex.rxjava3.functions.Function;
 import io.reactivex.rxjava3.internal.disposables.DisposableHelper;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.plugins.RxJavaPlugins;
 
+import java.util.Objects;
+
 public final class ObservableDematerialize<T, R> extends AbstractObservableWithUpstream<T, R> {
 
     final Function<? super T, ? extends Notification<R>> selector;
@@ -83,7 +84,7 @@ public void onNext(T item) {
             Notification<R> notification;
 
             try {
-                notification = ObjectHelper.requireNonNull(selector.apply(item), "The selector returned a null Notification");
+                notification = Objects.requireNonNull(selector.apply(item), "The selector returned a null Notification");
             } catch (Throwable ex) {
                 Exceptions.throwIfFatal(ex);
                 upstream.dispose();
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableDistinct.java b/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableDistinct.java
index 98c197156c..aadeafb2b1 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableDistinct.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableDistinct.java
@@ -14,13 +14,13 @@
 package io.reactivex.rxjava3.internal.operators.observable;
 
 import java.util.Collection;
+import java.util.Objects;
 
 import io.reactivex.rxjava3.annotations.Nullable;
 import io.reactivex.rxjava3.core.*;
 import io.reactivex.rxjava3.exceptions.Exceptions;
 import io.reactivex.rxjava3.functions.*;
 import io.reactivex.rxjava3.internal.disposables.EmptyDisposable;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.internal.observers.BasicFuseableObserver;
 import io.reactivex.rxjava3.internal.util.ExceptionHelper;
 import io.reactivex.rxjava3.plugins.RxJavaPlugins;
@@ -74,7 +74,7 @@ public void onNext(T value) {
                 boolean b;
 
                 try {
-                    key = ObjectHelper.requireNonNull(keySelector.apply(value), "The keySelector returned a null key");
+                    key = Objects.requireNonNull(keySelector.apply(value), "The keySelector returned a null key");
                     b = collection.add(key);
                 } catch (Throwable ex) {
                     fail(ex);
@@ -120,7 +120,7 @@ public T poll() throws Throwable {
             for (;;) {
                 T v = qd.poll();
 
-                if (v == null || collection.add(ObjectHelper.requireNonNull(keySelector.apply(v), "The keySelector returned a null key"))) {
+                if (v == null || collection.add(Objects.requireNonNull(keySelector.apply(v), "The keySelector returned a null key"))) {
                     return v;
                 }
             }
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableFlatMap.java b/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableFlatMap.java
index 596719176e..7e01d7cbc1 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableFlatMap.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableFlatMap.java
@@ -22,7 +22,6 @@
 import io.reactivex.rxjava3.exceptions.Exceptions;
 import io.reactivex.rxjava3.functions.*;
 import io.reactivex.rxjava3.internal.disposables.DisposableHelper;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.internal.fuseable.*;
 import io.reactivex.rxjava3.internal.queue.*;
 import io.reactivex.rxjava3.internal.util.AtomicThrowable;
@@ -117,7 +116,7 @@ public void onNext(T t) {
             }
             ObservableSource<? extends U> p;
             try {
-                p = ObjectHelper.requireNonNull(mapper.apply(t), "The mapper returned a null ObservableSource");
+                p = Objects.requireNonNull(mapper.apply(t), "The mapper returned a null ObservableSource");
             } catch (Throwable e) {
                 Exceptions.throwIfFatal(e);
                 upstream.dispose();
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableFlatMapCompletable.java b/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableFlatMapCompletable.java
index 26f0505a14..75fc80ac61 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableFlatMapCompletable.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableFlatMapCompletable.java
@@ -13,6 +13,7 @@
 
 package io.reactivex.rxjava3.internal.operators.observable;
 
+import java.util.Objects;
 import java.util.concurrent.atomic.AtomicReference;
 
 import io.reactivex.rxjava3.annotations.Nullable;
@@ -21,7 +22,6 @@
 import io.reactivex.rxjava3.exceptions.Exceptions;
 import io.reactivex.rxjava3.functions.Function;
 import io.reactivex.rxjava3.internal.disposables.DisposableHelper;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.internal.observers.BasicIntQueueDisposable;
 import io.reactivex.rxjava3.internal.util.AtomicThrowable;
 
@@ -88,7 +88,7 @@ public void onNext(T value) {
             CompletableSource cs;
 
             try {
-                cs = ObjectHelper.requireNonNull(mapper.apply(value), "The mapper returned a null CompletableSource");
+                cs = Objects.requireNonNull(mapper.apply(value), "The mapper returned a null CompletableSource");
             } catch (Throwable ex) {
                 Exceptions.throwIfFatal(ex);
                 upstream.dispose();
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableFlatMapCompletableCompletable.java b/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableFlatMapCompletableCompletable.java
index b9a9213769..ddf9602a05 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableFlatMapCompletableCompletable.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableFlatMapCompletableCompletable.java
@@ -13,6 +13,7 @@
 
 package io.reactivex.rxjava3.internal.operators.observable;
 
+import java.util.Objects;
 import java.util.concurrent.atomic.*;
 
 import io.reactivex.rxjava3.core.*;
@@ -20,7 +21,6 @@
 import io.reactivex.rxjava3.exceptions.Exceptions;
 import io.reactivex.rxjava3.functions.Function;
 import io.reactivex.rxjava3.internal.disposables.DisposableHelper;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.internal.fuseable.FuseToObservable;
 import io.reactivex.rxjava3.internal.util.AtomicThrowable;
 import io.reactivex.rxjava3.plugins.RxJavaPlugins;
@@ -94,7 +94,7 @@ public void onNext(T value) {
             CompletableSource cs;
 
             try {
-                cs = ObjectHelper.requireNonNull(mapper.apply(value), "The mapper returned a null CompletableSource");
+                cs = Objects.requireNonNull(mapper.apply(value), "The mapper returned a null CompletableSource");
             } catch (Throwable ex) {
                 Exceptions.throwIfFatal(ex);
                 upstream.dispose();
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableFlatMapMaybe.java b/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableFlatMapMaybe.java
index 9e323ec346..ac951a571c 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableFlatMapMaybe.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableFlatMapMaybe.java
@@ -13,6 +13,7 @@
 
 package io.reactivex.rxjava3.internal.operators.observable;
 
+import java.util.Objects;
 import java.util.concurrent.atomic.*;
 
 import io.reactivex.rxjava3.core.*;
@@ -20,7 +21,6 @@
 import io.reactivex.rxjava3.exceptions.Exceptions;
 import io.reactivex.rxjava3.functions.Function;
 import io.reactivex.rxjava3.internal.disposables.DisposableHelper;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.internal.queue.SpscLinkedArrayQueue;
 import io.reactivex.rxjava3.internal.util.AtomicThrowable;
 
@@ -96,7 +96,7 @@ public void onNext(T t) {
             MaybeSource<? extends R> ms;
 
             try {
-                ms = ObjectHelper.requireNonNull(mapper.apply(t), "The mapper returned a null MaybeSource");
+                ms = Objects.requireNonNull(mapper.apply(t), "The mapper returned a null MaybeSource");
             } catch (Throwable ex) {
                 Exceptions.throwIfFatal(ex);
                 upstream.dispose();
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableFlatMapSingle.java b/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableFlatMapSingle.java
index 4ca080a73f..6d5dd3da63 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableFlatMapSingle.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableFlatMapSingle.java
@@ -13,6 +13,7 @@
 
 package io.reactivex.rxjava3.internal.operators.observable;
 
+import java.util.Objects;
 import java.util.concurrent.atomic.*;
 
 import io.reactivex.rxjava3.core.*;
@@ -20,7 +21,6 @@
 import io.reactivex.rxjava3.exceptions.Exceptions;
 import io.reactivex.rxjava3.functions.Function;
 import io.reactivex.rxjava3.internal.disposables.DisposableHelper;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.internal.queue.SpscLinkedArrayQueue;
 import io.reactivex.rxjava3.internal.util.AtomicThrowable;
 
@@ -96,7 +96,7 @@ public void onNext(T t) {
             SingleSource<? extends R> ms;
 
             try {
-                ms = ObjectHelper.requireNonNull(mapper.apply(t), "The mapper returned a null SingleSource");
+                ms = Objects.requireNonNull(mapper.apply(t), "The mapper returned a null SingleSource");
             } catch (Throwable ex) {
                 Exceptions.throwIfFatal(ex);
                 upstream.dispose();
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableFlattenIterable.java b/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableFlattenIterable.java
index c6704398a1..3f90f31acd 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableFlattenIterable.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableFlattenIterable.java
@@ -14,13 +14,13 @@
 package io.reactivex.rxjava3.internal.operators.observable;
 
 import java.util.Iterator;
+import java.util.Objects;
 
 import io.reactivex.rxjava3.core.*;
 import io.reactivex.rxjava3.disposables.Disposable;
 import io.reactivex.rxjava3.exceptions.Exceptions;
 import io.reactivex.rxjava3.functions.Function;
 import io.reactivex.rxjava3.internal.disposables.DisposableHelper;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.plugins.RxJavaPlugins;
 
 /**
@@ -100,7 +100,7 @@ public void onNext(T value) {
                     R v;
 
                     try {
-                        v = ObjectHelper.requireNonNull(it.next(), "The iterator returned a null value");
+                        v = Objects.requireNonNull(it.next(), "The iterator returned a null value");
                     } catch (Throwable ex) {
                         Exceptions.throwIfFatal(ex);
                         upstream.dispose();
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableFromArray.java b/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableFromArray.java
index 7c4b09ba62..fb4beaaf21 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableFromArray.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableFromArray.java
@@ -15,9 +15,10 @@
 
 import io.reactivex.rxjava3.annotations.Nullable;
 import io.reactivex.rxjava3.core.*;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.internal.observers.BasicQueueDisposable;
 
+import java.util.Objects;
+
 public final class ObservableFromArray<T> extends Observable<T> {
     final T[] array;
     public ObservableFromArray(T[] array) {
@@ -70,7 +71,7 @@ public T poll() {
             T[] a = array;
             if (i != a.length) {
                 index = i + 1;
-                return ObjectHelper.requireNonNull(a[i], "The array element is null");
+                return Objects.requireNonNull(a[i], "The array element is null");
             }
             return null;
         }
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableFromIterable.java b/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableFromIterable.java
index 91811b3c4a..9edf260931 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableFromIterable.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableFromIterable.java
@@ -14,12 +14,12 @@
 package io.reactivex.rxjava3.internal.operators.observable;
 
 import java.util.Iterator;
+import java.util.Objects;
 
 import io.reactivex.rxjava3.annotations.Nullable;
 import io.reactivex.rxjava3.core.*;
 import io.reactivex.rxjava3.exceptions.Exceptions;
 import io.reactivex.rxjava3.internal.disposables.EmptyDisposable;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.internal.observers.BasicQueueDisposable;
 
 public final class ObservableFromIterable<T> extends Observable<T> {
@@ -88,7 +88,7 @@ void run() {
                 T v;
 
                 try {
-                    v = ObjectHelper.requireNonNull(it.next(), "The iterator returned a null value");
+                    v = Objects.requireNonNull(it.next(), "The iterator returned a null value");
                 } catch (Throwable e) {
                     Exceptions.throwIfFatal(e);
                     downstream.onError(e);
@@ -138,7 +138,7 @@ public T poll() {
                 checkNext = true;
             }
 
-            return ObjectHelper.requireNonNull(it.next(), "The iterator returned a null value");
+            return Objects.requireNonNull(it.next(), "The iterator returned a null value");
         }
 
         @Override
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableGroupBy.java b/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableGroupBy.java
index 821d2e81e1..78edf33cea 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableGroupBy.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableGroupBy.java
@@ -23,7 +23,6 @@
 import io.reactivex.rxjava3.exceptions.Exceptions;
 import io.reactivex.rxjava3.functions.Function;
 import io.reactivex.rxjava3.internal.disposables.*;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.internal.queue.SpscLinkedArrayQueue;
 import io.reactivex.rxjava3.observables.GroupedObservable;
 
@@ -115,7 +114,7 @@ public void onNext(T t) {
 
             V v;
             try {
-                v = ObjectHelper.requireNonNull(valueSelector.apply(t), "The value supplied is null");
+                v = Objects.requireNonNull(valueSelector.apply(t), "The value supplied is null");
             } catch (Throwable e) {
                 Exceptions.throwIfFatal(e);
                 upstream.dispose();
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableGroupJoin.java b/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableGroupJoin.java
index b6c9f811f4..7b12579966 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableGroupJoin.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableGroupJoin.java
@@ -26,7 +26,6 @@
 import io.reactivex.rxjava3.exceptions.Exceptions;
 import io.reactivex.rxjava3.functions.*;
 import io.reactivex.rxjava3.internal.disposables.DisposableHelper;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.internal.queue.SpscLinkedArrayQueue;
 import io.reactivex.rxjava3.internal.util.ExceptionHelper;
 import io.reactivex.rxjava3.plugins.RxJavaPlugins;
@@ -243,7 +242,7 @@ void drain() {
                         ObservableSource<TLeftEnd> p;
 
                         try {
-                            p = ObjectHelper.requireNonNull(leftEnd.apply(left), "The leftEnd returned a null ObservableSource");
+                            p = Objects.requireNonNull(leftEnd.apply(left), "The leftEnd returned a null ObservableSource");
                         } catch (Throwable exc) {
                             fail(exc, a, q);
                             return;
@@ -265,7 +264,7 @@ void drain() {
                         R w;
 
                         try {
-                            w = ObjectHelper.requireNonNull(resultSelector.apply(left, up), "The resultSelector returned a null value");
+                            w = Objects.requireNonNull(resultSelector.apply(left, up), "The resultSelector returned a null value");
                         } catch (Throwable exc) {
                             fail(exc, a, q);
                             return;
@@ -288,7 +287,7 @@ else if (mode == RIGHT_VALUE) {
                         ObservableSource<TRightEnd> p;
 
                         try {
-                            p = ObjectHelper.requireNonNull(rightEnd.apply(right), "The rightEnd returned a null ObservableSource");
+                            p = Objects.requireNonNull(rightEnd.apply(right), "The rightEnd returned a null ObservableSource");
                         } catch (Throwable exc) {
                             fail(exc, a, q);
                             return;
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableInternalHelper.java b/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableInternalHelper.java
index 1665b99014..fcd5f57fa5 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableInternalHelper.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableInternalHelper.java
@@ -12,6 +12,7 @@
  */
 package io.reactivex.rxjava3.internal.operators.observable;
 
+import java.util.Objects;
 import java.util.concurrent.TimeUnit;
 
 import io.reactivex.rxjava3.core.*;
@@ -73,7 +74,7 @@ static final class ItemDelayFunction<T, U> implements Function<T, ObservableSour
 
         @Override
         public ObservableSource<T> apply(final T v) throws Throwable {
-            ObservableSource<U> o = ObjectHelper.requireNonNull(itemDelay.apply(v), "The itemDelay returned a null ObservableSource");
+            ObservableSource<U> o = Objects.requireNonNull(itemDelay.apply(v), "The itemDelay returned a null ObservableSource");
             return new ObservableTake<U>(o, 1).map(Functions.justFunction(v)).defaultIfEmpty(v);
         }
     }
@@ -161,7 +162,7 @@ static final class FlatMapWithCombinerOuter<T, R, U> implements Function<T, Obse
         @Override
         public ObservableSource<R> apply(final T t) throws Throwable {
             @SuppressWarnings("unchecked")
-            ObservableSource<U> u = (ObservableSource<U>)ObjectHelper.requireNonNull(mapper.apply(t), "The mapper returned a null ObservableSource");
+            ObservableSource<U> u = (ObservableSource<U>)Objects.requireNonNull(mapper.apply(t), "The mapper returned a null ObservableSource");
             return new ObservableMap<U, R>(u, new FlatMapWithCombinerInner<U, R, T>(combiner, t));
         }
     }
@@ -181,7 +182,7 @@ static final class FlatMapIntoIterable<T, U> implements Function<T, ObservableSo
 
         @Override
         public ObservableSource<U> apply(T t) throws Throwable {
-            return new ObservableFromIterable<U>(ObjectHelper.requireNonNull(mapper.apply(t), "The mapper returned a null Iterable"));
+            return new ObservableFromIterable<U>(Objects.requireNonNull(mapper.apply(t), "The mapper returned a null Iterable"));
         }
     }
 
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableJoin.java b/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableJoin.java
index cf98732637..6660d342f3 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableJoin.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableJoin.java
@@ -24,7 +24,6 @@
 import io.reactivex.rxjava3.disposables.*;
 import io.reactivex.rxjava3.exceptions.Exceptions;
 import io.reactivex.rxjava3.functions.*;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.internal.operators.observable.ObservableGroupJoin.*;
 import io.reactivex.rxjava3.internal.queue.SpscLinkedArrayQueue;
 import io.reactivex.rxjava3.internal.util.ExceptionHelper;
@@ -219,7 +218,7 @@ void drain() {
                         ObservableSource<TLeftEnd> p;
 
                         try {
-                            p = ObjectHelper.requireNonNull(leftEnd.apply(left), "The leftEnd returned a null ObservableSource");
+                            p = Objects.requireNonNull(leftEnd.apply(left), "The leftEnd returned a null ObservableSource");
                         } catch (Throwable exc) {
                             fail(exc, a, q);
                             return;
@@ -243,7 +242,7 @@ void drain() {
                             R w;
 
                             try {
-                                w = ObjectHelper.requireNonNull(resultSelector.apply(left, right), "The resultSelector returned a null value");
+                                w = Objects.requireNonNull(resultSelector.apply(left, right), "The resultSelector returned a null value");
                             } catch (Throwable exc) {
                                 fail(exc, a, q);
                                 return;
@@ -263,7 +262,7 @@ else if (mode == RIGHT_VALUE) {
                         ObservableSource<TRightEnd> p;
 
                         try {
-                            p = ObjectHelper.requireNonNull(rightEnd.apply(right), "The rightEnd returned a null ObservableSource");
+                            p = Objects.requireNonNull(rightEnd.apply(right), "The rightEnd returned a null ObservableSource");
                         } catch (Throwable exc) {
                             fail(exc, a, q);
                             return;
@@ -287,7 +286,7 @@ else if (mode == RIGHT_VALUE) {
                             R w;
 
                             try {
-                                w = ObjectHelper.requireNonNull(resultSelector.apply(left, right), "The resultSelector returned a null value");
+                                w = Objects.requireNonNull(resultSelector.apply(left, right), "The resultSelector returned a null value");
                             } catch (Throwable exc) {
                                 fail(exc, a, q);
                                 return;
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableLift.java b/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableLift.java
index f38ac66bd3..4aa45683ff 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableLift.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableLift.java
@@ -15,9 +15,10 @@
 
 import io.reactivex.rxjava3.core.*;
 import io.reactivex.rxjava3.exceptions.Exceptions;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.plugins.RxJavaPlugins;
 
+import java.util.Objects;
+
 /**
  * Allows lifting operators into a chain of Observables.
  *
@@ -40,7 +41,7 @@ public ObservableLift(ObservableSource<T> source, ObservableOperator<? extends R
     public void subscribeActual(Observer<? super R> observer) {
         Observer<? super T> liftedObserver;
         try {
-            liftedObserver = ObjectHelper.requireNonNull(operator.apply(observer), "Operator " + operator + " returned a null Observer");
+            liftedObserver = Objects.requireNonNull(operator.apply(observer), "Operator " + operator + " returned a null Observer");
         } catch (NullPointerException e) { // NOPMD
             throw e;
         } catch (Throwable e) {
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableMap.java b/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableMap.java
index 9bff5de703..4361016ec6 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableMap.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableMap.java
@@ -16,9 +16,10 @@
 import io.reactivex.rxjava3.annotations.Nullable;
 import io.reactivex.rxjava3.core.*;
 import io.reactivex.rxjava3.functions.Function;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.internal.observers.BasicFuseableObserver;
 
+import java.util.Objects;
+
 public final class ObservableMap<T, U> extends AbstractObservableWithUpstream<T, U> {
     final Function<? super T, ? extends U> function;
 
@@ -54,7 +55,7 @@ public void onNext(T t) {
             U v;
 
             try {
-                v = ObjectHelper.requireNonNull(mapper.apply(t), "The mapper function returned a null value.");
+                v = Objects.requireNonNull(mapper.apply(t), "The mapper function returned a null value.");
             } catch (Throwable ex) {
                 fail(ex);
                 return;
@@ -71,7 +72,7 @@ public int requestFusion(int mode) {
         @Override
         public U poll() throws Throwable {
             T t = qd.poll();
-            return t != null ? ObjectHelper.<U>requireNonNull(mapper.apply(t), "The mapper function returned a null value.") : null;
+            return t != null ? Objects.requireNonNull(mapper.apply(t), "The mapper function returned a null value.") : null;
         }
     }
 }
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableMapNotification.java b/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableMapNotification.java
index 8ef5a5395d..147c21ae37 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableMapNotification.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableMapNotification.java
@@ -18,7 +18,8 @@
 import io.reactivex.rxjava3.exceptions.*;
 import io.reactivex.rxjava3.functions.*;
 import io.reactivex.rxjava3.internal.disposables.DisposableHelper;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
+
+import java.util.Objects;
 
 public final class ObservableMapNotification<T, R> extends AbstractObservableWithUpstream<T, ObservableSource<? extends R>> {
 
@@ -84,7 +85,7 @@ public void onNext(T t) {
             ObservableSource<? extends R> p;
 
             try {
-                p = ObjectHelper.requireNonNull(onNextMapper.apply(t), "The onNext ObservableSource returned is null");
+                p = Objects.requireNonNull(onNextMapper.apply(t), "The onNext ObservableSource returned is null");
             } catch (Throwable e) {
                 Exceptions.throwIfFatal(e);
                 downstream.onError(e);
@@ -99,7 +100,7 @@ public void onError(Throwable t) {
             ObservableSource<? extends R> p;
 
             try {
-                p = ObjectHelper.requireNonNull(onErrorMapper.apply(t), "The onError ObservableSource returned is null");
+                p = Objects.requireNonNull(onErrorMapper.apply(t), "The onError ObservableSource returned is null");
             } catch (Throwable e) {
                 Exceptions.throwIfFatal(e);
                 downstream.onError(new CompositeException(t, e));
@@ -115,7 +116,7 @@ public void onComplete() {
             ObservableSource<? extends R> p;
 
             try {
-                p = ObjectHelper.requireNonNull(onCompleteSupplier.get(), "The onComplete ObservableSource returned is null");
+                p = Objects.requireNonNull(onCompleteSupplier.get(), "The onComplete ObservableSource returned is null");
             } catch (Throwable e) {
                 Exceptions.throwIfFatal(e);
                 downstream.onError(e);
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservablePublishSelector.java b/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservablePublishSelector.java
index ef7d2367fc..8247a6abfc 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservablePublishSelector.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservablePublishSelector.java
@@ -13,6 +13,7 @@
 
 package io.reactivex.rxjava3.internal.operators.observable;
 
+import java.util.Objects;
 import java.util.concurrent.atomic.AtomicReference;
 
 import io.reactivex.rxjava3.core.*;
@@ -20,7 +21,6 @@
 import io.reactivex.rxjava3.exceptions.Exceptions;
 import io.reactivex.rxjava3.functions.Function;
 import io.reactivex.rxjava3.internal.disposables.*;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.subjects.PublishSubject;
 
 /**
@@ -45,7 +45,7 @@ protected void subscribeActual(Observer<? super R> observer) {
         ObservableSource<? extends R> target;
 
         try {
-            target = ObjectHelper.requireNonNull(selector.apply(subject), "The selector returned a null ObservableSource");
+            target = Objects.requireNonNull(selector.apply(subject), "The selector returned a null ObservableSource");
         } catch (Throwable ex) {
             Exceptions.throwIfFatal(ex);
             EmptyDisposable.error(ex, observer);
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableReduceMaybe.java b/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableReduceMaybe.java
index 24d5e5d568..bab7bbb065 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableReduceMaybe.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableReduceMaybe.java
@@ -18,9 +18,10 @@
 import io.reactivex.rxjava3.exceptions.Exceptions;
 import io.reactivex.rxjava3.functions.BiFunction;
 import io.reactivex.rxjava3.internal.disposables.DisposableHelper;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.plugins.RxJavaPlugins;
 
+import java.util.Objects;
+
 /**
  * Reduce a sequence of values into a single value via an aggregator function and emit the final value or complete
  * if the source is empty.
@@ -78,7 +79,7 @@ public void onNext(T value) {
                     this.value = value;
                 } else {
                     try {
-                        this.value = ObjectHelper.requireNonNull(reducer.apply(v, value), "The reducer returned a null value");
+                        this.value = Objects.requireNonNull(reducer.apply(v, value), "The reducer returned a null value");
                     } catch (Throwable ex) {
                         Exceptions.throwIfFatal(ex);
                         upstream.dispose();
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableReduceSeedSingle.java b/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableReduceSeedSingle.java
index 4ec8ac8bcc..e6b0d1d0ef 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableReduceSeedSingle.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableReduceSeedSingle.java
@@ -18,9 +18,10 @@
 import io.reactivex.rxjava3.exceptions.Exceptions;
 import io.reactivex.rxjava3.functions.BiFunction;
 import io.reactivex.rxjava3.internal.disposables.DisposableHelper;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.plugins.RxJavaPlugins;
 
+import java.util.Objects;
+
 /**
  * Reduce a sequence of values, starting from a seed value and by using
  * an accumulator function and return the last accumulated value.
@@ -77,7 +78,7 @@ public void onNext(T value) {
             R v = this.value;
             if (v != null) {
                 try {
-                    this.value = ObjectHelper.requireNonNull(reducer.apply(v, value), "The reducer returned a null value");
+                    this.value = Objects.requireNonNull(reducer.apply(v, value), "The reducer returned a null value");
                 } catch (Throwable ex) {
                     Exceptions.throwIfFatal(ex);
                     upstream.dispose();
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableReduceWithSingle.java b/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableReduceWithSingle.java
index e7b1b16813..956d7bf7c9 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableReduceWithSingle.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableReduceWithSingle.java
@@ -17,9 +17,10 @@
 import io.reactivex.rxjava3.exceptions.Exceptions;
 import io.reactivex.rxjava3.functions.*;
 import io.reactivex.rxjava3.internal.disposables.EmptyDisposable;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.internal.operators.observable.ObservableReduceSeedSingle.ReduceSeedObserver;
 
+import java.util.Objects;
+
 /**
  * Reduce a sequence of values, starting from a generated seed value and by using
  * an accumulator function and return the last accumulated value.
@@ -46,7 +47,7 @@ protected void subscribeActual(SingleObserver<? super R> observer) {
         R seed;
 
         try {
-            seed = ObjectHelper.requireNonNull(seedSupplier.get(), "The seedSupplier returned a null value");
+            seed = Objects.requireNonNull(seedSupplier.get(), "The seedSupplier returned a null value");
         } catch (Throwable ex) {
             Exceptions.throwIfFatal(ex);
             EmptyDisposable.error(ex, observer);
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableRepeatWhen.java b/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableRepeatWhen.java
index abdf42b872..eff1e248ac 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableRepeatWhen.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableRepeatWhen.java
@@ -13,6 +13,7 @@
 
 package io.reactivex.rxjava3.internal.operators.observable;
 
+import java.util.Objects;
 import java.util.concurrent.atomic.*;
 
 import io.reactivex.rxjava3.core.*;
@@ -20,7 +21,6 @@
 import io.reactivex.rxjava3.exceptions.Exceptions;
 import io.reactivex.rxjava3.functions.Function;
 import io.reactivex.rxjava3.internal.disposables.*;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.internal.util.*;
 import io.reactivex.rxjava3.subjects.*;
 
@@ -45,7 +45,7 @@ protected void subscribeActual(Observer<? super T> observer) {
         ObservableSource<?> other;
 
         try {
-            other = ObjectHelper.requireNonNull(handler.apply(signaller), "The handler returned a null ObservableSource");
+            other = Objects.requireNonNull(handler.apply(signaller), "The handler returned a null ObservableSource");
         } catch (Throwable ex) {
             Exceptions.throwIfFatal(ex);
             EmptyDisposable.error(ex, observer);
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableReplay.java b/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableReplay.java
index 1bb4f344d4..ba0811b85c 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableReplay.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableReplay.java
@@ -24,7 +24,6 @@
 import io.reactivex.rxjava3.exceptions.Exceptions;
 import io.reactivex.rxjava3.functions.*;
 import io.reactivex.rxjava3.internal.disposables.*;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.internal.fuseable.HasUpstreamObservableSource;
 import io.reactivex.rxjava3.internal.util.*;
 import io.reactivex.rxjava3.observables.ConnectableObservable;
@@ -1054,8 +1053,8 @@ protected void subscribeActual(Observer<? super R> child) {
             ConnectableObservable<U> co;
             ObservableSource<R> observable;
             try {
-                co = ObjectHelper.requireNonNull(connectableFactory.get(), "The connectableFactory returned a null ConnectableObservable");
-                observable = ObjectHelper.requireNonNull(selector.apply(co), "The selector returned a null ObservableSource");
+                co = Objects.requireNonNull(connectableFactory.get(), "The connectableFactory returned a null ConnectableObservable");
+                observable = Objects.requireNonNull(selector.apply(co), "The selector returned a null ObservableSource");
             } catch (Throwable e) {
                 Exceptions.throwIfFatal(e);
                 EmptyDisposable.error(e, child);
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableRetryWhen.java b/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableRetryWhen.java
index 054887adab..0eb5fbb5b7 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableRetryWhen.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableRetryWhen.java
@@ -13,6 +13,7 @@
 
 package io.reactivex.rxjava3.internal.operators.observable;
 
+import java.util.Objects;
 import java.util.concurrent.atomic.*;
 
 import io.reactivex.rxjava3.core.*;
@@ -20,7 +21,6 @@
 import io.reactivex.rxjava3.exceptions.Exceptions;
 import io.reactivex.rxjava3.functions.Function;
 import io.reactivex.rxjava3.internal.disposables.*;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.internal.util.*;
 import io.reactivex.rxjava3.subjects.*;
 
@@ -45,7 +45,7 @@ protected void subscribeActual(Observer<? super T> observer) {
         ObservableSource<?> other;
 
         try {
-            other = ObjectHelper.requireNonNull(handler.apply(signaller), "The handler returned a null ObservableSource");
+            other = Objects.requireNonNull(handler.apply(signaller), "The handler returned a null ObservableSource");
         } catch (Throwable ex) {
             Exceptions.throwIfFatal(ex);
             EmptyDisposable.error(ex, observer);
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableScalarXMap.java b/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableScalarXMap.java
index 85c13e27e7..128d327e2b 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableScalarXMap.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableScalarXMap.java
@@ -13,6 +13,7 @@
 
 package io.reactivex.rxjava3.internal.operators.observable;
 
+import java.util.Objects;
 import java.util.concurrent.atomic.AtomicInteger;
 
 import io.reactivex.rxjava3.annotations.Nullable;
@@ -20,7 +21,6 @@
 import io.reactivex.rxjava3.exceptions.Exceptions;
 import io.reactivex.rxjava3.functions.*;
 import io.reactivex.rxjava3.internal.disposables.EmptyDisposable;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.internal.fuseable.QueueDisposable;
 import io.reactivex.rxjava3.plugins.RxJavaPlugins;
 
@@ -66,7 +66,7 @@ public static <T, R> boolean tryScalarXMapSubscribe(ObservableSource<T> source,
             ObservableSource<? extends R> r;
 
             try {
-                r = ObjectHelper.requireNonNull(mapper.apply(t), "The mapper returned a null ObservableSource");
+                r = Objects.requireNonNull(mapper.apply(t), "The mapper returned a null ObservableSource");
             } catch (Throwable ex) {
                 Exceptions.throwIfFatal(ex);
                 EmptyDisposable.error(ex, observer);
@@ -138,7 +138,7 @@ static final class ScalarXMapObservable<T, R> extends Observable<R> {
         public void subscribeActual(Observer<? super R> observer) {
             ObservableSource<? extends R> other;
             try {
-                other = ObjectHelper.requireNonNull(mapper.apply(value), "The mapper returned a null ObservableSource");
+                other = Objects.requireNonNull(mapper.apply(value), "The mapper returned a null ObservableSource");
             } catch (Throwable e) {
                 EmptyDisposable.error(e, observer);
                 return;
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableScan.java b/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableScan.java
index 026b3ac5eb..94918b6c39 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableScan.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableScan.java
@@ -18,9 +18,10 @@
 import io.reactivex.rxjava3.exceptions.Exceptions;
 import io.reactivex.rxjava3.functions.BiFunction;
 import io.reactivex.rxjava3.internal.disposables.DisposableHelper;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.plugins.RxJavaPlugins;
 
+import java.util.Objects;
+
 public final class ObservableScan<T> extends AbstractObservableWithUpstream<T, T> {
     final BiFunction<T, T, T> accumulator;
     public ObservableScan(ObservableSource<T> source, BiFunction<T, T, T> accumulator) {
@@ -80,7 +81,7 @@ public void onNext(T t) {
                 T u;
 
                 try {
-                    u = ObjectHelper.requireNonNull(accumulator.apply(v, t), "The value returned by the accumulator is null");
+                    u = Objects.requireNonNull(accumulator.apply(v, t), "The value returned by the accumulator is null");
                 } catch (Throwable e) {
                     Exceptions.throwIfFatal(e);
                     upstream.dispose();
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableScanSeed.java b/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableScanSeed.java
index e13c6fe189..24e4b580ad 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableScanSeed.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableScanSeed.java
@@ -17,9 +17,10 @@
 import io.reactivex.rxjava3.exceptions.Exceptions;
 import io.reactivex.rxjava3.functions.*;
 import io.reactivex.rxjava3.internal.disposables.*;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.plugins.RxJavaPlugins;
 
+import java.util.Objects;
+
 public final class ObservableScanSeed<T, R> extends AbstractObservableWithUpstream<T, R> {
     final BiFunction<R, ? super T, R> accumulator;
     final Supplier<R> seedSupplier;
@@ -35,7 +36,7 @@ public void subscribeActual(Observer<? super R> t) {
         R r;
 
         try {
-            r = ObjectHelper.requireNonNull(seedSupplier.get(), "The seed supplied is null");
+            r = Objects.requireNonNull(seedSupplier.get(), "The seed supplied is null");
         } catch (Throwable e) {
             Exceptions.throwIfFatal(e);
             EmptyDisposable.error(e, t);
@@ -93,7 +94,7 @@ public void onNext(T t) {
             R u;
 
             try {
-                u = ObjectHelper.requireNonNull(accumulator.apply(v, t), "The accumulator returned a null value");
+                u = Objects.requireNonNull(accumulator.apply(v, t), "The accumulator returned a null value");
             } catch (Throwable e) {
                 Exceptions.throwIfFatal(e);
                 upstream.dispose();
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableSwitchMap.java b/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableSwitchMap.java
index d9d50fc032..bca0f1beeb 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableSwitchMap.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableSwitchMap.java
@@ -13,6 +13,7 @@
 
 package io.reactivex.rxjava3.internal.operators.observable;
 
+import java.util.Objects;
 import java.util.concurrent.atomic.*;
 
 import io.reactivex.rxjava3.core.*;
@@ -20,7 +21,6 @@
 import io.reactivex.rxjava3.exceptions.Exceptions;
 import io.reactivex.rxjava3.functions.Function;
 import io.reactivex.rxjava3.internal.disposables.DisposableHelper;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.internal.fuseable.*;
 import io.reactivex.rxjava3.internal.queue.SpscLinkedArrayQueue;
 import io.reactivex.rxjava3.internal.util.AtomicThrowable;
@@ -108,7 +108,7 @@ public void onNext(T t) {
 
             ObservableSource<? extends R> p;
             try {
-                p = ObjectHelper.requireNonNull(mapper.apply(t), "The ObservableSource returned is null");
+                p = Objects.requireNonNull(mapper.apply(t), "The ObservableSource returned is null");
             } catch (Throwable e) {
                 Exceptions.throwIfFatal(e);
                 upstream.dispose();
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableTimeout.java b/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableTimeout.java
index 4fe72feadd..a9ada29730 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableTimeout.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableTimeout.java
@@ -13,6 +13,7 @@
 
 package io.reactivex.rxjava3.internal.operators.observable;
 
+import java.util.Objects;
 import java.util.concurrent.TimeoutException;
 import java.util.concurrent.atomic.*;
 
@@ -21,7 +22,6 @@
 import io.reactivex.rxjava3.exceptions.Exceptions;
 import io.reactivex.rxjava3.functions.Function;
 import io.reactivex.rxjava3.internal.disposables.*;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.internal.operators.observable.ObservableTimeoutTimed.TimeoutSupport;
 import io.reactivex.rxjava3.plugins.RxJavaPlugins;
 
@@ -102,7 +102,7 @@ public void onNext(T t) {
             ObservableSource<?> itemTimeoutObservableSource;
 
             try {
-                itemTimeoutObservableSource = ObjectHelper.requireNonNull(
+                itemTimeoutObservableSource = Objects.requireNonNull(
                         itemTimeoutIndicator.apply(t),
                         "The itemTimeoutIndicator returned a null ObservableSource.");
             } catch (Throwable ex) {
@@ -231,7 +231,7 @@ public void onNext(T t) {
             ObservableSource<?> itemTimeoutObservableSource;
 
             try {
-                itemTimeoutObservableSource = ObjectHelper.requireNonNull(
+                itemTimeoutObservableSource = Objects.requireNonNull(
                         itemTimeoutIndicator.apply(t),
                         "The itemTimeoutIndicator returned a null ObservableSource.");
             } catch (Throwable ex) {
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableUsing.java b/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableUsing.java
index 3a4e5d81e2..60fad9e740 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableUsing.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableUsing.java
@@ -13,6 +13,7 @@
 
 package io.reactivex.rxjava3.internal.operators.observable;
 
+import java.util.Objects;
 import java.util.concurrent.atomic.AtomicBoolean;
 
 import io.reactivex.rxjava3.core.*;
@@ -20,7 +21,6 @@
 import io.reactivex.rxjava3.exceptions.*;
 import io.reactivex.rxjava3.functions.*;
 import io.reactivex.rxjava3.internal.disposables.*;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.plugins.RxJavaPlugins;
 
 public final class ObservableUsing<T, D> extends Observable<T> {
@@ -53,7 +53,7 @@ public void subscribeActual(Observer<? super T> observer) {
 
         ObservableSource<? extends T> source;
         try {
-            source = ObjectHelper.requireNonNull(sourceSupplier.apply(resource), "The sourceSupplier returned a null ObservableSource");
+            source = Objects.requireNonNull(sourceSupplier.apply(resource), "The sourceSupplier returned a null ObservableSource");
         } catch (Throwable e) {
             Exceptions.throwIfFatal(e);
             try {
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableWindowBoundarySelector.java b/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableWindowBoundarySelector.java
index 037c7d0773..5ea42da118 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableWindowBoundarySelector.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableWindowBoundarySelector.java
@@ -23,7 +23,6 @@
 import io.reactivex.rxjava3.exceptions.Exceptions;
 import io.reactivex.rxjava3.functions.Function;
 import io.reactivex.rxjava3.internal.disposables.DisposableHelper;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.internal.fuseable.SimplePlainQueue;
 import io.reactivex.rxjava3.internal.queue.MpscLinkedQueue;
 import io.reactivex.rxjava3.internal.util.*;
@@ -236,7 +235,7 @@ void drain() {
 
                                 ObservableSource<V> endSource;
                                 try {
-                                    endSource = ObjectHelper.requireNonNull(closingIndicator.apply(startItem), "The closingIndicator returned a null ObservableSource");
+                                    endSource = Objects.requireNonNull(closingIndicator.apply(startItem), "The closingIndicator returned a null ObservableSource");
                                 } catch (Throwable ex) {
                                     upstream.dispose();
                                     startObserver.dispose();
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableWithLatestFrom.java b/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableWithLatestFrom.java
index 91b4b0266d..6ac680db30 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableWithLatestFrom.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableWithLatestFrom.java
@@ -13,6 +13,7 @@
 
 package io.reactivex.rxjava3.internal.operators.observable;
 
+import java.util.Objects;
 import java.util.concurrent.atomic.AtomicReference;
 
 import io.reactivex.rxjava3.core.*;
@@ -20,7 +21,6 @@
 import io.reactivex.rxjava3.exceptions.Exceptions;
 import io.reactivex.rxjava3.functions.BiFunction;
 import io.reactivex.rxjava3.internal.disposables.DisposableHelper;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.observers.SerializedObserver;
 
 public final class ObservableWithLatestFrom<T, U, R> extends AbstractObservableWithUpstream<T, R> {
@@ -73,7 +73,7 @@ public void onNext(T t) {
             if (u != null) {
                 R r;
                 try {
-                    r = ObjectHelper.requireNonNull(combiner.apply(t, u), "The combiner returned a null value");
+                    r = Objects.requireNonNull(combiner.apply(t, u), "The combiner returned a null value");
                 } catch (Throwable e) {
                     Exceptions.throwIfFatal(e);
                     dispose();
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableWithLatestFromMany.java b/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableWithLatestFromMany.java
index fc64adc42f..73d28032fc 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableWithLatestFromMany.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableWithLatestFromMany.java
@@ -13,6 +13,7 @@
 package io.reactivex.rxjava3.internal.operators.observable;
 
 import java.util.Arrays;
+import java.util.Objects;
 import java.util.concurrent.atomic.*;
 
 import io.reactivex.rxjava3.annotations.*;
@@ -21,7 +22,6 @@
 import io.reactivex.rxjava3.exceptions.Exceptions;
 import io.reactivex.rxjava3.functions.Function;
 import io.reactivex.rxjava3.internal.disposables.*;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.internal.util.*;
 import io.reactivex.rxjava3.plugins.RxJavaPlugins;
 
@@ -164,7 +164,7 @@ public void onNext(T t) {
             R v;
 
             try {
-                v = ObjectHelper.requireNonNull(combiner.apply(objects), "combiner returned a null value");
+                v = Objects.requireNonNull(combiner.apply(objects), "combiner returned a null value");
             } catch (Throwable ex) {
                 Exceptions.throwIfFatal(ex);
                 dispose();
@@ -285,7 +285,7 @@ public void dispose() {
     final class SingletonArrayFunc implements Function<T, R> {
         @Override
         public R apply(T t) throws Throwable {
-            return ObjectHelper.requireNonNull(combiner.apply(new Object[] { t }), "The combiner returned a null value");
+            return Objects.requireNonNull(combiner.apply(new Object[] { t }), "The combiner returned a null value");
         }
     }
 }
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableZip.java b/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableZip.java
index b3d40dc2ed..80ae9b174b 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableZip.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableZip.java
@@ -14,6 +14,7 @@
 package io.reactivex.rxjava3.internal.operators.observable;
 
 import java.util.Arrays;
+import java.util.Objects;
 import java.util.concurrent.atomic.*;
 
 import io.reactivex.rxjava3.core.*;
@@ -21,7 +22,6 @@
 import io.reactivex.rxjava3.exceptions.Exceptions;
 import io.reactivex.rxjava3.functions.Function;
 import io.reactivex.rxjava3.internal.disposables.*;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.internal.queue.SpscLinkedArrayQueue;
 
 public final class ObservableZip<T, R> extends Observable<R> {
@@ -195,7 +195,7 @@ public void drain() {
 
                     R v;
                     try {
-                        v = ObjectHelper.requireNonNull(zipper.apply(os.clone()), "The zipper returned a null value");
+                        v = Objects.requireNonNull(zipper.apply(os.clone()), "The zipper returned a null value");
                     } catch (Throwable ex) {
                         Exceptions.throwIfFatal(ex);
                         cancel();
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableZipIterable.java b/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableZipIterable.java
index d86b90395d..d775c58515 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableZipIterable.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/observable/ObservableZipIterable.java
@@ -14,13 +14,13 @@
 package io.reactivex.rxjava3.internal.operators.observable;
 
 import java.util.Iterator;
+import java.util.Objects;
 
 import io.reactivex.rxjava3.core.*;
 import io.reactivex.rxjava3.disposables.Disposable;
 import io.reactivex.rxjava3.exceptions.Exceptions;
 import io.reactivex.rxjava3.functions.BiFunction;
 import io.reactivex.rxjava3.internal.disposables.*;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.plugins.RxJavaPlugins;
 
 public final class ObservableZipIterable<T, U, V> extends Observable<V> {
@@ -41,7 +41,7 @@ public void subscribeActual(Observer<? super V> t) {
         Iterator<U> it;
 
         try {
-            it = ObjectHelper.requireNonNull(other.iterator(), "The iterator returned by other is null");
+            it = Objects.requireNonNull(other.iterator(), "The iterator returned by other is null");
         } catch (Throwable e) {
             Exceptions.throwIfFatal(e);
             EmptyDisposable.error(e, t);
@@ -109,7 +109,7 @@ public void onNext(T t) {
             U u;
 
             try {
-                u = ObjectHelper.requireNonNull(iterator.next(), "The iterator returned a null value");
+                u = Objects.requireNonNull(iterator.next(), "The iterator returned a null value");
             } catch (Throwable e) {
                 Exceptions.throwIfFatal(e);
                 error(e);
@@ -118,7 +118,7 @@ public void onNext(T t) {
 
             V v;
             try {
-                v = ObjectHelper.requireNonNull(zipper.apply(t, u), "The zipper function returned a null value");
+                v = Objects.requireNonNull(zipper.apply(t, u), "The zipper function returned a null value");
             } catch (Throwable e) {
                 Exceptions.throwIfFatal(e);
                 error(e);
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/parallel/ParallelCollect.java b/src/main/java/io/reactivex/rxjava3/internal/operators/parallel/ParallelCollect.java
index d37bcfa1b3..e1da1b76b7 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/parallel/ParallelCollect.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/parallel/ParallelCollect.java
@@ -17,12 +17,13 @@
 
 import io.reactivex.rxjava3.exceptions.Exceptions;
 import io.reactivex.rxjava3.functions.*;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.internal.subscribers.DeferredScalarSubscriber;
 import io.reactivex.rxjava3.internal.subscriptions.*;
 import io.reactivex.rxjava3.parallel.ParallelFlowable;
 import io.reactivex.rxjava3.plugins.RxJavaPlugins;
 
+import java.util.Objects;
+
 /**
  * Reduce the sequence of values in each 'rail' to a single value.
  *
@@ -59,7 +60,7 @@ public void subscribe(Subscriber<? super C>[] subscribers) {
             C initialValue;
 
             try {
-                initialValue = ObjectHelper.requireNonNull(initialCollection.get(), "The initialSupplier returned a null value");
+                initialValue = Objects.requireNonNull(initialCollection.get(), "The initialSupplier returned a null value");
             } catch (Throwable ex) {
                 Exceptions.throwIfFatal(ex);
                 reportError(subscribers, ex);
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/parallel/ParallelConcatMap.java b/src/main/java/io/reactivex/rxjava3/internal/operators/parallel/ParallelConcatMap.java
index 5b7d3ef5c4..1ff745ecba 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/parallel/ParallelConcatMap.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/parallel/ParallelConcatMap.java
@@ -16,11 +16,12 @@
 import org.reactivestreams.*;
 
 import io.reactivex.rxjava3.functions.Function;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.internal.operators.flowable.FlowableConcatMap;
 import io.reactivex.rxjava3.internal.util.ErrorMode;
 import io.reactivex.rxjava3.parallel.ParallelFlowable;
 
+import java.util.Objects;
+
 /**
  * Concatenates the generated Publishers on each rail.
  *
@@ -42,9 +43,9 @@ public ParallelConcatMap(
             Function<? super T, ? extends Publisher<? extends R>> mapper,
                     int prefetch, ErrorMode errorMode) {
         this.source = source;
-        this.mapper = ObjectHelper.requireNonNull(mapper, "mapper");
+        this.mapper = Objects.requireNonNull(mapper, "mapper");
         this.prefetch = prefetch;
-        this.errorMode = ObjectHelper.requireNonNull(errorMode, "errorMode");
+        this.errorMode = Objects.requireNonNull(errorMode, "errorMode");
     }
 
     @Override
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/parallel/ParallelDoOnNextTry.java b/src/main/java/io/reactivex/rxjava3/internal/operators/parallel/ParallelDoOnNextTry.java
index 0e93abcccb..557d5282c4 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/parallel/ParallelDoOnNextTry.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/parallel/ParallelDoOnNextTry.java
@@ -17,12 +17,13 @@
 
 import io.reactivex.rxjava3.exceptions.*;
 import io.reactivex.rxjava3.functions.*;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.internal.fuseable.ConditionalSubscriber;
 import io.reactivex.rxjava3.internal.subscriptions.SubscriptionHelper;
 import io.reactivex.rxjava3.parallel.*;
 import io.reactivex.rxjava3.plugins.RxJavaPlugins;
 
+import java.util.Objects;
+
 /**
  * Calls a Consumer for each upstream value passing by
  * and handles any failure with a handler function.
@@ -133,7 +134,7 @@ public boolean tryOnNext(T t) {
                     ParallelFailureHandling h;
 
                     try {
-                        h = ObjectHelper.requireNonNull(errorHandler.apply(++retries, ex), "The errorHandler returned a null item");
+                        h = Objects.requireNonNull(errorHandler.apply(++retries, ex), "The errorHandler returned a null item");
                     } catch (Throwable exc) {
                         Exceptions.throwIfFatal(exc);
                         cancel();
@@ -244,7 +245,7 @@ public boolean tryOnNext(T t) {
                     ParallelFailureHandling h;
 
                     try {
-                        h = ObjectHelper.requireNonNull(errorHandler.apply(++retries, ex), "The errorHandler returned a null item");
+                        h = Objects.requireNonNull(errorHandler.apply(++retries, ex), "The errorHandler returned a null item");
                     } catch (Throwable exc) {
                         Exceptions.throwIfFatal(exc);
                         cancel();
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/parallel/ParallelFilterTry.java b/src/main/java/io/reactivex/rxjava3/internal/operators/parallel/ParallelFilterTry.java
index 12366c30fa..f6eff78249 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/parallel/ParallelFilterTry.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/parallel/ParallelFilterTry.java
@@ -17,12 +17,13 @@
 
 import io.reactivex.rxjava3.exceptions.*;
 import io.reactivex.rxjava3.functions.*;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.internal.fuseable.ConditionalSubscriber;
 import io.reactivex.rxjava3.internal.subscriptions.SubscriptionHelper;
 import io.reactivex.rxjava3.parallel.*;
 import io.reactivex.rxjava3.plugins.RxJavaPlugins;
 
+import java.util.Objects;
+
 /**
  * Filters each 'rail' of the source ParallelFlowable with a predicate function.
  *
@@ -136,7 +137,7 @@ public boolean tryOnNext(T t) {
                         ParallelFailureHandling h;
 
                         try {
-                            h = ObjectHelper.requireNonNull(errorHandler.apply(++retries, ex), "The errorHandler returned a null item");
+                            h = Objects.requireNonNull(errorHandler.apply(++retries, ex), "The errorHandler returned a null item");
                         } catch (Throwable exc) {
                             Exceptions.throwIfFatal(exc);
                             cancel();
@@ -225,7 +226,7 @@ public boolean tryOnNext(T t) {
                         ParallelFailureHandling h;
 
                         try {
-                            h = ObjectHelper.requireNonNull(errorHandler.apply(++retries, ex), "The errorHandler returned a null item");
+                            h = Objects.requireNonNull(errorHandler.apply(++retries, ex), "The errorHandler returned a null item");
                         } catch (Throwable exc) {
                             Exceptions.throwIfFatal(exc);
                             cancel();
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/parallel/ParallelMap.java b/src/main/java/io/reactivex/rxjava3/internal/operators/parallel/ParallelMap.java
index b262bfa240..c941887853 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/parallel/ParallelMap.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/parallel/ParallelMap.java
@@ -18,12 +18,13 @@
 import io.reactivex.rxjava3.core.FlowableSubscriber;
 import io.reactivex.rxjava3.exceptions.Exceptions;
 import io.reactivex.rxjava3.functions.Function;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.internal.fuseable.ConditionalSubscriber;
 import io.reactivex.rxjava3.internal.subscriptions.SubscriptionHelper;
 import io.reactivex.rxjava3.parallel.ParallelFlowable;
 import io.reactivex.rxjava3.plugins.RxJavaPlugins;
 
+import java.util.Objects;
+
 /**
  * Maps each 'rail' of the source ParallelFlowable with a mapper function.
  *
@@ -110,7 +111,7 @@ public void onNext(T t) {
             R v;
 
             try {
-                v = ObjectHelper.requireNonNull(mapper.apply(t), "The mapper returned a null value");
+                v = Objects.requireNonNull(mapper.apply(t), "The mapper returned a null value");
             } catch (Throwable ex) {
                 Exceptions.throwIfFatal(ex);
                 cancel();
@@ -183,7 +184,7 @@ public void onNext(T t) {
             R v;
 
             try {
-                v = ObjectHelper.requireNonNull(mapper.apply(t), "The mapper returned a null value");
+                v = Objects.requireNonNull(mapper.apply(t), "The mapper returned a null value");
             } catch (Throwable ex) {
                 Exceptions.throwIfFatal(ex);
                 cancel();
@@ -202,7 +203,7 @@ public boolean tryOnNext(T t) {
             R v;
 
             try {
-                v = ObjectHelper.requireNonNull(mapper.apply(t), "The mapper returned a null value");
+                v = Objects.requireNonNull(mapper.apply(t), "The mapper returned a null value");
             } catch (Throwable ex) {
                 Exceptions.throwIfFatal(ex);
                 cancel();
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/parallel/ParallelMapTry.java b/src/main/java/io/reactivex/rxjava3/internal/operators/parallel/ParallelMapTry.java
index 8096116ea5..ff8da40c62 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/parallel/ParallelMapTry.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/parallel/ParallelMapTry.java
@@ -17,12 +17,13 @@
 
 import io.reactivex.rxjava3.exceptions.*;
 import io.reactivex.rxjava3.functions.*;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.internal.fuseable.ConditionalSubscriber;
 import io.reactivex.rxjava3.internal.subscriptions.SubscriptionHelper;
 import io.reactivex.rxjava3.parallel.*;
 import io.reactivex.rxjava3.plugins.RxJavaPlugins;
 
+import java.util.Objects;
+
 /**
  * Maps each 'rail' of the source ParallelFlowable with a mapper function
  * and handle any failure based on a handler function.
@@ -129,14 +130,14 @@ public boolean tryOnNext(T t) {
                 R v;
 
                 try {
-                    v = ObjectHelper.requireNonNull(mapper.apply(t), "The mapper returned a null value");
+                    v = Objects.requireNonNull(mapper.apply(t), "The mapper returned a null value");
                 } catch (Throwable ex) {
                     Exceptions.throwIfFatal(ex);
 
                     ParallelFailureHandling h;
 
                     try {
-                        h = ObjectHelper.requireNonNull(errorHandler.apply(++retries, ex), "The errorHandler returned a null item");
+                        h = Objects.requireNonNull(errorHandler.apply(++retries, ex), "The errorHandler returned a null item");
                     } catch (Throwable exc) {
                         Exceptions.throwIfFatal(exc);
                         cancel();
@@ -242,14 +243,14 @@ public boolean tryOnNext(T t) {
                 R v;
 
                 try {
-                    v = ObjectHelper.requireNonNull(mapper.apply(t), "The mapper returned a null value");
+                    v = Objects.requireNonNull(mapper.apply(t), "The mapper returned a null value");
                 } catch (Throwable ex) {
                     Exceptions.throwIfFatal(ex);
 
                     ParallelFailureHandling h;
 
                     try {
-                        h = ObjectHelper.requireNonNull(errorHandler.apply(++retries, ex), "The errorHandler returned a null item");
+                        h = Objects.requireNonNull(errorHandler.apply(++retries, ex), "The errorHandler returned a null item");
                     } catch (Throwable exc) {
                         Exceptions.throwIfFatal(exc);
                         cancel();
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/parallel/ParallelPeek.java b/src/main/java/io/reactivex/rxjava3/internal/operators/parallel/ParallelPeek.java
index 4c15e207d4..50f04d46ec 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/parallel/ParallelPeek.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/parallel/ParallelPeek.java
@@ -18,11 +18,12 @@
 import io.reactivex.rxjava3.core.FlowableSubscriber;
 import io.reactivex.rxjava3.exceptions.*;
 import io.reactivex.rxjava3.functions.*;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.internal.subscriptions.*;
 import io.reactivex.rxjava3.parallel.ParallelFlowable;
 import io.reactivex.rxjava3.plugins.RxJavaPlugins;
 
+import java.util.Objects;
+
 /**
  * Execute a Consumer in each 'rail' for the current element passing through.
  *
@@ -53,14 +54,14 @@ public ParallelPeek(ParallelFlowable<T> source,
     ) {
         this.source = source;
 
-        this.onNext = ObjectHelper.requireNonNull(onNext, "onNext is null");
-        this.onAfterNext = ObjectHelper.requireNonNull(onAfterNext, "onAfterNext is null");
-        this.onError = ObjectHelper.requireNonNull(onError, "onError is null");
-        this.onComplete = ObjectHelper.requireNonNull(onComplete, "onComplete is null");
-        this.onAfterTerminated = ObjectHelper.requireNonNull(onAfterTerminated, "onAfterTerminated is null");
-        this.onSubscribe = ObjectHelper.requireNonNull(onSubscribe, "onSubscribe is null");
-        this.onRequest = ObjectHelper.requireNonNull(onRequest, "onRequest is null");
-        this.onCancel = ObjectHelper.requireNonNull(onCancel, "onCancel is null");
+        this.onNext = Objects.requireNonNull(onNext, "onNext is null");
+        this.onAfterNext = Objects.requireNonNull(onAfterNext, "onAfterNext is null");
+        this.onError = Objects.requireNonNull(onError, "onError is null");
+        this.onComplete = Objects.requireNonNull(onComplete, "onComplete is null");
+        this.onAfterTerminated = Objects.requireNonNull(onAfterTerminated, "onAfterTerminated is null");
+        this.onSubscribe = Objects.requireNonNull(onSubscribe, "onSubscribe is null");
+        this.onRequest = Objects.requireNonNull(onRequest, "onRequest is null");
+        this.onCancel = Objects.requireNonNull(onCancel, "onCancel is null");
     }
 
     @Override
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/parallel/ParallelReduce.java b/src/main/java/io/reactivex/rxjava3/internal/operators/parallel/ParallelReduce.java
index f813149407..87c02c8922 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/parallel/ParallelReduce.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/parallel/ParallelReduce.java
@@ -17,12 +17,13 @@
 
 import io.reactivex.rxjava3.exceptions.Exceptions;
 import io.reactivex.rxjava3.functions.*;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.internal.subscribers.DeferredScalarSubscriber;
 import io.reactivex.rxjava3.internal.subscriptions.*;
 import io.reactivex.rxjava3.parallel.ParallelFlowable;
 import io.reactivex.rxjava3.plugins.RxJavaPlugins;
 
+import java.util.Objects;
+
 /**
  * Reduce the sequence of values in each 'rail' to a single value.
  *
@@ -58,7 +59,7 @@ public void subscribe(Subscriber<? super R>[] subscribers) {
             R initialValue;
 
             try {
-                initialValue = ObjectHelper.requireNonNull(initialSupplier.get(), "The initialSupplier returned a null value");
+                initialValue = Objects.requireNonNull(initialSupplier.get(), "The initialSupplier returned a null value");
             } catch (Throwable ex) {
                 Exceptions.throwIfFatal(ex);
                 reportError(subscribers, ex);
@@ -115,7 +116,7 @@ public void onNext(T t) {
                 R v;
 
                 try {
-                    v = ObjectHelper.requireNonNull(reducer.apply(accumulator, t), "The reducer returned a null value");
+                    v = Objects.requireNonNull(reducer.apply(accumulator, t), "The reducer returned a null value");
                 } catch (Throwable ex) {
                     Exceptions.throwIfFatal(ex);
                     cancel();
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/parallel/ParallelReduceFull.java b/src/main/java/io/reactivex/rxjava3/internal/operators/parallel/ParallelReduceFull.java
index 3a8cfa2290..e376c352cb 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/parallel/ParallelReduceFull.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/parallel/ParallelReduceFull.java
@@ -13,6 +13,7 @@
 
 package io.reactivex.rxjava3.internal.operators.parallel;
 
+import java.util.Objects;
 import java.util.concurrent.atomic.*;
 
 import org.reactivestreams.*;
@@ -20,7 +21,6 @@
 import io.reactivex.rxjava3.core.*;
 import io.reactivex.rxjava3.exceptions.Exceptions;
 import io.reactivex.rxjava3.functions.BiFunction;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.internal.subscriptions.*;
 import io.reactivex.rxjava3.parallel.ParallelFlowable;
 import io.reactivex.rxjava3.plugins.RxJavaPlugins;
@@ -132,7 +132,7 @@ void innerComplete(T value) {
                     if (sp != null) {
 
                         try {
-                            value = ObjectHelper.requireNonNull(reducer.apply(sp.first, sp.second), "The reducer returned a null value");
+                            value = Objects.requireNonNull(reducer.apply(sp.first, sp.second), "The reducer returned a null value");
                         } catch (Throwable ex) {
                             Exceptions.throwIfFatal(ex);
                             innerError(ex);
@@ -192,7 +192,7 @@ public void onNext(T t) {
                 } else {
 
                     try {
-                        v = ObjectHelper.requireNonNull(reducer.apply(v, t), "The reducer returned a null value");
+                        v = Objects.requireNonNull(reducer.apply(v, t), "The reducer returned a null value");
                     } catch (Throwable ex) {
                         Exceptions.throwIfFatal(ex);
                         get().cancel();
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/single/SingleDefer.java b/src/main/java/io/reactivex/rxjava3/internal/operators/single/SingleDefer.java
index fff2ca8d58..24a35fbdee 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/single/SingleDefer.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/single/SingleDefer.java
@@ -17,7 +17,8 @@
 import io.reactivex.rxjava3.exceptions.Exceptions;
 import io.reactivex.rxjava3.functions.Supplier;
 import io.reactivex.rxjava3.internal.disposables.EmptyDisposable;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
+
+import java.util.Objects;
 
 public final class SingleDefer<T> extends Single<T> {
 
@@ -32,7 +33,7 @@ protected void subscribeActual(SingleObserver<? super T> observer) {
         SingleSource<? extends T> next;
 
         try {
-            next = ObjectHelper.requireNonNull(singleSupplier.get(), "The singleSupplier returned a null SingleSource");
+            next = Objects.requireNonNull(singleSupplier.get(), "The singleSupplier returned a null SingleSource");
         } catch (Throwable e) {
             Exceptions.throwIfFatal(e);
             EmptyDisposable.error(e, observer);
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/single/SingleDematerialize.java b/src/main/java/io/reactivex/rxjava3/internal/operators/single/SingleDematerialize.java
index 15f57b631b..4582e4d4da 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/single/SingleDematerialize.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/single/SingleDematerialize.java
@@ -18,7 +18,8 @@
 import io.reactivex.rxjava3.exceptions.Exceptions;
 import io.reactivex.rxjava3.functions.Function;
 import io.reactivex.rxjava3.internal.disposables.DisposableHelper;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
+
+import java.util.Objects;
 
 /**
  * Maps the success value of the source to a Notification, then
@@ -81,7 +82,7 @@ public void onSuccess(T t) {
             Notification<R> notification;
 
             try {
-                notification = ObjectHelper.requireNonNull(selector.apply(t), "The selector returned a null Notification");
+                notification = Objects.requireNonNull(selector.apply(t), "The selector returned a null Notification");
             } catch (Throwable ex) {
                 Exceptions.throwIfFatal(ex);
                 downstream.onError(ex);
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/single/SingleFlatMap.java b/src/main/java/io/reactivex/rxjava3/internal/operators/single/SingleFlatMap.java
index 3128c93e5a..d622f83fae 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/single/SingleFlatMap.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/single/SingleFlatMap.java
@@ -13,6 +13,7 @@
 
 package io.reactivex.rxjava3.internal.operators.single;
 
+import java.util.Objects;
 import java.util.concurrent.atomic.AtomicReference;
 
 import io.reactivex.rxjava3.core.*;
@@ -20,7 +21,6 @@
 import io.reactivex.rxjava3.exceptions.Exceptions;
 import io.reactivex.rxjava3.functions.Function;
 import io.reactivex.rxjava3.internal.disposables.DisposableHelper;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 
 public final class SingleFlatMap<T, R> extends Single<R> {
     final SingleSource<? extends T> source;
@@ -74,7 +74,7 @@ public void onSuccess(T value) {
             SingleSource<? extends R> o;
 
             try {
-                o = ObjectHelper.requireNonNull(mapper.apply(value), "The single returned by the mapper is null");
+                o = Objects.requireNonNull(mapper.apply(value), "The single returned by the mapper is null");
             } catch (Throwable e) {
                 Exceptions.throwIfFatal(e);
                 downstream.onError(e);
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/single/SingleFlatMapCompletable.java b/src/main/java/io/reactivex/rxjava3/internal/operators/single/SingleFlatMapCompletable.java
index 03edadb83b..d4a9f54737 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/single/SingleFlatMapCompletable.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/single/SingleFlatMapCompletable.java
@@ -13,6 +13,7 @@
 
 package io.reactivex.rxjava3.internal.operators.single;
 
+import java.util.Objects;
 import java.util.concurrent.atomic.AtomicReference;
 
 import io.reactivex.rxjava3.core.*;
@@ -20,7 +21,6 @@
 import io.reactivex.rxjava3.exceptions.Exceptions;
 import io.reactivex.rxjava3.functions.Function;
 import io.reactivex.rxjava3.internal.disposables.DisposableHelper;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 
 /**
  * Maps the success value of the source SingleSource into a Completable.
@@ -80,7 +80,7 @@ public void onSuccess(T value) {
             CompletableSource cs;
 
             try {
-                cs = ObjectHelper.requireNonNull(mapper.apply(value), "The mapper returned a null CompletableSource");
+                cs = Objects.requireNonNull(mapper.apply(value), "The mapper returned a null CompletableSource");
             } catch (Throwable ex) {
                 Exceptions.throwIfFatal(ex);
                 onError(ex);
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/single/SingleFlatMapIterableFlowable.java b/src/main/java/io/reactivex/rxjava3/internal/operators/single/SingleFlatMapIterableFlowable.java
index cc7f2740b9..0d9e4aee0f 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/single/SingleFlatMapIterableFlowable.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/single/SingleFlatMapIterableFlowable.java
@@ -14,6 +14,7 @@
 package io.reactivex.rxjava3.internal.operators.single;
 
 import java.util.Iterator;
+import java.util.Objects;
 import java.util.concurrent.atomic.AtomicLong;
 
 import org.reactivestreams.Subscriber;
@@ -24,7 +25,6 @@
 import io.reactivex.rxjava3.exceptions.Exceptions;
 import io.reactivex.rxjava3.functions.Function;
 import io.reactivex.rxjava3.internal.disposables.DisposableHelper;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.internal.subscriptions.*;
 import io.reactivex.rxjava3.internal.util.BackpressureHelper;
 
@@ -166,7 +166,7 @@ void drain() {
                         R v;
 
                         try {
-                            v = ObjectHelper.requireNonNull(iterator.next(), "The iterator returned a null value");
+                            v = Objects.requireNonNull(iterator.next(), "The iterator returned a null value");
                         } catch (Throwable ex) {
                             Exceptions.throwIfFatal(ex);
                             a.onError(ex);
@@ -277,7 +277,7 @@ public R poll() throws Exception {
             Iterator<? extends R> iterator = it;
 
             if (iterator != null) {
-                R v = ObjectHelper.requireNonNull(iterator.next(), "The iterator returned a null value");
+                R v = Objects.requireNonNull(iterator.next(), "The iterator returned a null value");
                 if (!iterator.hasNext()) {
                     it = null;
                 }
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/single/SingleFlatMapIterableObservable.java b/src/main/java/io/reactivex/rxjava3/internal/operators/single/SingleFlatMapIterableObservable.java
index d742a06e1c..795f60a3ca 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/single/SingleFlatMapIterableObservable.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/single/SingleFlatMapIterableObservable.java
@@ -14,6 +14,7 @@
 package io.reactivex.rxjava3.internal.operators.single;
 
 import java.util.Iterator;
+import java.util.Objects;
 
 import io.reactivex.rxjava3.annotations.Nullable;
 import io.reactivex.rxjava3.core.*;
@@ -21,7 +22,6 @@
 import io.reactivex.rxjava3.exceptions.Exceptions;
 import io.reactivex.rxjava3.functions.Function;
 import io.reactivex.rxjava3.internal.disposables.DisposableHelper;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.internal.observers.BasicIntQueueDisposable;
 
 /**
@@ -187,7 +187,7 @@ public R poll() throws Exception {
             Iterator<? extends R> iterator = it;
 
             if (iterator != null) {
-                R v = ObjectHelper.requireNonNull(iterator.next(), "The iterator returned a null value");
+                R v = Objects.requireNonNull(iterator.next(), "The iterator returned a null value");
                 if (!iterator.hasNext()) {
                     it = null;
                 }
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/single/SingleFlatMapMaybe.java b/src/main/java/io/reactivex/rxjava3/internal/operators/single/SingleFlatMapMaybe.java
index 20e60ab476..d810f8f5c3 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/single/SingleFlatMapMaybe.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/single/SingleFlatMapMaybe.java
@@ -13,6 +13,7 @@
 
 package io.reactivex.rxjava3.internal.operators.single;
 
+import java.util.Objects;
 import java.util.concurrent.atomic.AtomicReference;
 
 import io.reactivex.rxjava3.core.*;
@@ -20,7 +21,6 @@
 import io.reactivex.rxjava3.exceptions.Exceptions;
 import io.reactivex.rxjava3.functions.Function;
 import io.reactivex.rxjava3.internal.disposables.DisposableHelper;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 
 public final class SingleFlatMapMaybe<T, R> extends Maybe<R> {
 
@@ -75,7 +75,7 @@ public void onSuccess(T value) {
             MaybeSource<? extends R> ms;
 
             try {
-                ms = ObjectHelper.requireNonNull(mapper.apply(value), "The mapper returned a null MaybeSource");
+                ms = Objects.requireNonNull(mapper.apply(value), "The mapper returned a null MaybeSource");
             } catch (Throwable ex) {
                 Exceptions.throwIfFatal(ex);
                 onError(ex);
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/single/SingleFlatMapPublisher.java b/src/main/java/io/reactivex/rxjava3/internal/operators/single/SingleFlatMapPublisher.java
index 0fb91438c8..4a636ba337 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/single/SingleFlatMapPublisher.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/single/SingleFlatMapPublisher.java
@@ -13,6 +13,7 @@
 
 package io.reactivex.rxjava3.internal.operators.single;
 
+import java.util.Objects;
 import java.util.concurrent.atomic.*;
 
 import org.reactivestreams.*;
@@ -21,7 +22,6 @@
 import io.reactivex.rxjava3.disposables.Disposable;
 import io.reactivex.rxjava3.exceptions.Exceptions;
 import io.reactivex.rxjava3.functions.Function;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.internal.subscriptions.SubscriptionHelper;
 
 /**
@@ -86,7 +86,7 @@ public void onSubscribe(Disposable d) {
         public void onSuccess(S value) {
             Publisher<? extends T> f;
             try {
-                f = ObjectHelper.requireNonNull(mapper.apply(value), "the mapper returned a null Publisher");
+                f = Objects.requireNonNull(mapper.apply(value), "the mapper returned a null Publisher");
             } catch (Throwable e) {
                 Exceptions.throwIfFatal(e);
                 downstream.onError(e);
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/single/SingleFromCallable.java b/src/main/java/io/reactivex/rxjava3/internal/operators/single/SingleFromCallable.java
index 562032f01e..5300d968b0 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/single/SingleFromCallable.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/single/SingleFromCallable.java
@@ -13,12 +13,12 @@
 
 package io.reactivex.rxjava3.internal.operators.single;
 
+import java.util.Objects;
 import java.util.concurrent.Callable;
 
 import io.reactivex.rxjava3.core.*;
 import io.reactivex.rxjava3.disposables.*;
 import io.reactivex.rxjava3.exceptions.Exceptions;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.plugins.RxJavaPlugins;
 
 public final class SingleFromCallable<T> extends Single<T> {
@@ -40,7 +40,7 @@ protected void subscribeActual(SingleObserver<? super T> observer) {
         T value;
 
         try {
-            value = ObjectHelper.requireNonNull(callable.call(), "The callable returned a null value");
+            value = Objects.requireNonNull(callable.call(), "The callable returned a null value");
         } catch (Throwable ex) {
             Exceptions.throwIfFatal(ex);
             if (!d.isDisposed()) {
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/single/SingleFromSupplier.java b/src/main/java/io/reactivex/rxjava3/internal/operators/single/SingleFromSupplier.java
index 04d6ca72cf..88dcd7dc94 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/single/SingleFromSupplier.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/single/SingleFromSupplier.java
@@ -17,9 +17,10 @@
 import io.reactivex.rxjava3.disposables.*;
 import io.reactivex.rxjava3.exceptions.Exceptions;
 import io.reactivex.rxjava3.functions.Supplier;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.plugins.RxJavaPlugins;
 
+import java.util.Objects;
+
 /**
  * Calls a supplier and emits its value or exception to the incoming SingleObserver.
  * @param <T> the value type returned
@@ -44,7 +45,7 @@ protected void subscribeActual(SingleObserver<? super T> observer) {
         T value;
 
         try {
-            value = ObjectHelper.requireNonNull(supplier.get(), "The supplier returned a null value");
+            value = Objects.requireNonNull(supplier.get(), "The supplier returned a null value");
         } catch (Throwable ex) {
             Exceptions.throwIfFatal(ex);
             if (!d.isDisposed()) {
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/single/SingleLift.java b/src/main/java/io/reactivex/rxjava3/internal/operators/single/SingleLift.java
index af5f969157..8382b2f1b8 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/single/SingleLift.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/single/SingleLift.java
@@ -16,7 +16,8 @@
 import io.reactivex.rxjava3.core.*;
 import io.reactivex.rxjava3.exceptions.Exceptions;
 import io.reactivex.rxjava3.internal.disposables.EmptyDisposable;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
+
+import java.util.Objects;
 
 public final class SingleLift<T, R> extends Single<R> {
 
@@ -34,7 +35,7 @@ protected void subscribeActual(SingleObserver<? super R> observer) {
         SingleObserver<? super T> sr;
 
         try {
-            sr = ObjectHelper.requireNonNull(onLift.apply(observer), "The onLift returned a null SingleObserver");
+            sr = Objects.requireNonNull(onLift.apply(observer), "The onLift returned a null SingleObserver");
         } catch (Throwable ex) {
             Exceptions.throwIfFatal(ex);
             EmptyDisposable.error(ex, observer);
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/single/SingleMap.java b/src/main/java/io/reactivex/rxjava3/internal/operators/single/SingleMap.java
index d6ee948d5a..534b41495c 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/single/SingleMap.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/single/SingleMap.java
@@ -17,7 +17,8 @@
 import io.reactivex.rxjava3.disposables.Disposable;
 import io.reactivex.rxjava3.exceptions.Exceptions;
 import io.reactivex.rxjava3.functions.Function;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
+
+import java.util.Objects;
 
 public final class SingleMap<T, R> extends Single<R> {
     final SingleSource<? extends T> source;
@@ -54,7 +55,7 @@ public void onSubscribe(Disposable d) {
         public void onSuccess(T value) {
             R v;
             try {
-                v = ObjectHelper.requireNonNull(mapper.apply(value), "The mapper function returned a null value.");
+                v = Objects.requireNonNull(mapper.apply(value), "The mapper function returned a null value.");
             } catch (Throwable e) {
                 Exceptions.throwIfFatal(e);
                 onError(e);
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/single/SingleResumeNext.java b/src/main/java/io/reactivex/rxjava3/internal/operators/single/SingleResumeNext.java
index 71ccfdc035..6f768591e8 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/single/SingleResumeNext.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/single/SingleResumeNext.java
@@ -13,6 +13,7 @@
 
 package io.reactivex.rxjava3.internal.operators.single;
 
+import java.util.Objects;
 import java.util.concurrent.atomic.AtomicReference;
 
 import io.reactivex.rxjava3.core.*;
@@ -20,7 +21,6 @@
 import io.reactivex.rxjava3.exceptions.*;
 import io.reactivex.rxjava3.functions.Function;
 import io.reactivex.rxjava3.internal.disposables.DisposableHelper;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.internal.observers.ResumeSingleObserver;
 
 public final class SingleResumeNext<T> extends Single<T> {
@@ -70,7 +70,7 @@ public void onError(Throwable e) {
             SingleSource<? extends T> source;
 
             try {
-                source = ObjectHelper.requireNonNull(nextFunction.apply(e), "The nextFunction returned a null SingleSource.");
+                source = Objects.requireNonNull(nextFunction.apply(e), "The nextFunction returned a null SingleSource.");
             } catch (Throwable ex) {
                 Exceptions.throwIfFatal(ex);
                 downstream.onError(new CompositeException(e, ex));
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/single/SingleUsing.java b/src/main/java/io/reactivex/rxjava3/internal/operators/single/SingleUsing.java
index a0cb1d84d9..57f9daf263 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/single/SingleUsing.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/single/SingleUsing.java
@@ -13,6 +13,7 @@
 
 package io.reactivex.rxjava3.internal.operators.single;
 
+import java.util.Objects;
 import java.util.concurrent.atomic.AtomicReference;
 
 import io.reactivex.rxjava3.core.*;
@@ -20,7 +21,6 @@
 import io.reactivex.rxjava3.exceptions.*;
 import io.reactivex.rxjava3.functions.*;
 import io.reactivex.rxjava3.internal.disposables.*;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.plugins.RxJavaPlugins;
 
 public final class SingleUsing<T, U> extends Single<T> {
@@ -56,7 +56,7 @@ protected void subscribeActual(final SingleObserver<? super T> observer) {
         SingleSource<? extends T> source;
 
         try {
-            source = ObjectHelper.requireNonNull(singleFunction.apply(resource), "The singleFunction returned a null SingleSource");
+            source = Objects.requireNonNull(singleFunction.apply(resource), "The singleFunction returned a null SingleSource");
         } catch (Throwable ex) {
             Exceptions.throwIfFatal(ex);
 
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/single/SingleZipArray.java b/src/main/java/io/reactivex/rxjava3/internal/operators/single/SingleZipArray.java
index 9633e94bc7..b207476c95 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/single/SingleZipArray.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/single/SingleZipArray.java
@@ -13,6 +13,7 @@
 
 package io.reactivex.rxjava3.internal.operators.single;
 
+import java.util.Objects;
 import java.util.concurrent.atomic.*;
 
 import io.reactivex.rxjava3.core.*;
@@ -20,7 +21,6 @@
 import io.reactivex.rxjava3.exceptions.Exceptions;
 import io.reactivex.rxjava3.functions.Function;
 import io.reactivex.rxjava3.internal.disposables.DisposableHelper;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.plugins.RxJavaPlugins;
 
 public final class SingleZipArray<T, R> extends Single<R> {
@@ -109,7 +109,7 @@ void innerSuccess(T value, int index) {
                 R v;
 
                 try {
-                    v = ObjectHelper.requireNonNull(zipper.apply(values), "The zipper returned a null value");
+                    v = Objects.requireNonNull(zipper.apply(values), "The zipper returned a null value");
                 } catch (Throwable ex) {
                     Exceptions.throwIfFatal(ex);
                     downstream.onError(ex);
@@ -179,7 +179,7 @@ public void onError(Throwable e) {
     final class SingletonArrayFunc implements Function<T, R> {
         @Override
         public R apply(T t) throws Throwable {
-            return ObjectHelper.requireNonNull(zipper.apply(new Object[] { t }), "The zipper returned a null value");
+            return Objects.requireNonNull(zipper.apply(new Object[] { t }), "The zipper returned a null value");
         }
     }
 }
diff --git a/src/main/java/io/reactivex/rxjava3/internal/operators/single/SingleZipIterable.java b/src/main/java/io/reactivex/rxjava3/internal/operators/single/SingleZipIterable.java
index 215f19a58e..b41538aeb4 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/operators/single/SingleZipIterable.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/operators/single/SingleZipIterable.java
@@ -19,7 +19,6 @@
 import io.reactivex.rxjava3.exceptions.Exceptions;
 import io.reactivex.rxjava3.functions.Function;
 import io.reactivex.rxjava3.internal.disposables.EmptyDisposable;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.internal.operators.single.SingleZipArray.ZipCoordinator;
 
 public final class SingleZipIterable<T, R> extends Single<R> {
@@ -82,7 +81,7 @@ protected void subscribeActual(SingleObserver<? super R> observer) {
     final class SingletonArrayFunc implements Function<T, R> {
         @Override
         public R apply(T t) throws Throwable {
-            return ObjectHelper.requireNonNull(zipper.apply(new Object[] { t }), "The zipper returned a null value");
+            return Objects.requireNonNull(zipper.apply(new Object[] { t }), "The zipper returned a null value");
         }
     }
 }
diff --git a/src/main/java/io/reactivex/rxjava3/internal/subscriptions/SubscriptionArbiter.java b/src/main/java/io/reactivex/rxjava3/internal/subscriptions/SubscriptionArbiter.java
index c3fb7955fa..6a50ab07dc 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/subscriptions/SubscriptionArbiter.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/subscriptions/SubscriptionArbiter.java
@@ -25,11 +25,11 @@
  * the License for the specific language governing permissions and limitations under the License.
  */
 
+import java.util.Objects;
 import java.util.concurrent.atomic.*;
 
 import org.reactivestreams.Subscription;
 
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.internal.util.BackpressureHelper;
 
 /**
@@ -78,7 +78,7 @@ public final void setSubscription(Subscription s) {
             return;
         }
 
-        ObjectHelper.requireNonNull(s, "s is null");
+        Objects.requireNonNull(s, "s is null");
 
         if (get() == 0 && compareAndSet(0, 1)) {
             Subscription a = actual;
diff --git a/src/main/java/io/reactivex/rxjava3/internal/subscriptions/SubscriptionHelper.java b/src/main/java/io/reactivex/rxjava3/internal/subscriptions/SubscriptionHelper.java
index 7080b3472c..8cfc3f5a7c 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/subscriptions/SubscriptionHelper.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/subscriptions/SubscriptionHelper.java
@@ -13,12 +13,12 @@
 
 package io.reactivex.rxjava3.internal.subscriptions;
 
+import java.util.Objects;
 import java.util.concurrent.atomic.*;
 
 import org.reactivestreams.Subscription;
 
 import io.reactivex.rxjava3.exceptions.ProtocolViolationException;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.internal.util.BackpressureHelper;
 import io.reactivex.rxjava3.plugins.RxJavaPlugins;
 
@@ -129,7 +129,7 @@ public static boolean set(AtomicReference<Subscription> field, Subscription s) {
      * @return true if the operation succeeded, false if the target field was not null.
      */
     public static boolean setOnce(AtomicReference<Subscription> field, Subscription s) {
-        ObjectHelper.requireNonNull(s, "s is null");
+        Objects.requireNonNull(s, "s is null");
         if (!field.compareAndSet(null, s)) {
             s.cancel();
             if (field.get() != CANCELLED) {
diff --git a/src/main/java/io/reactivex/rxjava3/internal/util/EndConsumerHelper.java b/src/main/java/io/reactivex/rxjava3/internal/util/EndConsumerHelper.java
index 1e051a636c..01b95a0a11 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/util/EndConsumerHelper.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/util/EndConsumerHelper.java
@@ -13,6 +13,7 @@
 
 package io.reactivex.rxjava3.internal.util;
 
+import java.util.Objects;
 import java.util.concurrent.atomic.AtomicReference;
 
 import org.reactivestreams.Subscription;
@@ -20,7 +21,6 @@
 import io.reactivex.rxjava3.disposables.Disposable;
 import io.reactivex.rxjava3.exceptions.ProtocolViolationException;
 import io.reactivex.rxjava3.internal.disposables.DisposableHelper;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.internal.subscriptions.SubscriptionHelper;
 import io.reactivex.rxjava3.plugins.RxJavaPlugins;
 
@@ -50,7 +50,7 @@ private EndConsumerHelper() {
      * @return true if successful, false if the upstream was non null
      */
     public static boolean validate(Disposable upstream, Disposable next, Class<?> observer) {
-        ObjectHelper.requireNonNull(next, "next is null");
+        Objects.requireNonNull(next, "next is null");
         if (upstream != null) {
             next.dispose();
             if (upstream != DisposableHelper.DISPOSED) {
@@ -72,7 +72,7 @@ public static boolean validate(Disposable upstream, Disposable next, Class<?> ob
      * @return true if successful, false if the content of the AtomicReference was non null
      */
     public static boolean setOnce(AtomicReference<Disposable> upstream, Disposable next, Class<?> observer) {
-        ObjectHelper.requireNonNull(next, "next is null");
+        Objects.requireNonNull(next, "next is null");
         if (!upstream.compareAndSet(null, next)) {
             next.dispose();
             if (upstream.get() != DisposableHelper.DISPOSED) {
@@ -95,7 +95,7 @@ public static boolean setOnce(AtomicReference<Disposable> upstream, Disposable n
      * @return true if successful, false if the upstream was non null
      */
     public static boolean validate(Subscription upstream, Subscription next, Class<?> subscriber) {
-        ObjectHelper.requireNonNull(next, "next is null");
+        Objects.requireNonNull(next, "next is null");
         if (upstream != null) {
             next.cancel();
             if (upstream != SubscriptionHelper.CANCELLED) {
@@ -117,7 +117,7 @@ public static boolean validate(Subscription upstream, Subscription next, Class<?
      * @return true if successful, false if the content of the AtomicReference was non null
      */
     public static boolean setOnce(AtomicReference<Subscription> upstream, Subscription next, Class<?> subscriber) {
-        ObjectHelper.requireNonNull(next, "next is null");
+        Objects.requireNonNull(next, "next is null");
         if (!upstream.compareAndSet(null, next)) {
             next.cancel();
             if (upstream.get() != SubscriptionHelper.CANCELLED) {
diff --git a/src/main/java/io/reactivex/rxjava3/internal/util/ExceptionHelper.java b/src/main/java/io/reactivex/rxjava3/internal/util/ExceptionHelper.java
index 606368d041..c4aaadb343 100644
--- a/src/main/java/io/reactivex/rxjava3/internal/util/ExceptionHelper.java
+++ b/src/main/java/io/reactivex/rxjava3/internal/util/ExceptionHelper.java
@@ -165,7 +165,7 @@ public static NullPointerException createNullPointerException(String prefix) {
     }
 
     /**
-     * Similar to ObjectHelper.requireNonNull but composes the error message via
+     * Similar to Objects.requireNonNull but composes the error message via
      * {@link #nullWarning(String)}.
      * @param <T> the value type
      * @param value the value to check
diff --git a/src/main/java/io/reactivex/rxjava3/observables/ConnectableObservable.java b/src/main/java/io/reactivex/rxjava3/observables/ConnectableObservable.java
index 135f183ceb..1a9b942011 100644
--- a/src/main/java/io/reactivex/rxjava3/observables/ConnectableObservable.java
+++ b/src/main/java/io/reactivex/rxjava3/observables/ConnectableObservable.java
@@ -13,6 +13,7 @@
 
 package io.reactivex.rxjava3.observables;
 
+import java.util.Objects;
 import java.util.concurrent.TimeUnit;
 
 import io.reactivex.rxjava3.annotations.*;
@@ -209,8 +210,8 @@ public final Observable<T> refCount(int subscriberCount, long timeout, TimeUnit
     @SchedulerSupport(SchedulerSupport.CUSTOM)
     public final Observable<T> refCount(int subscriberCount, long timeout, TimeUnit unit, Scheduler scheduler) {
         ObjectHelper.verifyPositive(subscriberCount, "subscriberCount");
-        ObjectHelper.requireNonNull(unit, "unit is null");
-        ObjectHelper.requireNonNull(scheduler, "scheduler is null");
+        Objects.requireNonNull(unit, "unit is null");
+        Objects.requireNonNull(scheduler, "scheduler is null");
         return RxJavaPlugins.onAssembly(new ObservableRefCount<T>(this, subscriberCount, timeout, unit, scheduler));
     }
 
diff --git a/src/main/java/io/reactivex/rxjava3/observers/ResourceCompletableObserver.java b/src/main/java/io/reactivex/rxjava3/observers/ResourceCompletableObserver.java
index 3a7ab322a6..b57d77f6f5 100644
--- a/src/main/java/io/reactivex/rxjava3/observers/ResourceCompletableObserver.java
+++ b/src/main/java/io/reactivex/rxjava3/observers/ResourceCompletableObserver.java
@@ -13,13 +13,13 @@
 
 package io.reactivex.rxjava3.observers;
 
+import java.util.Objects;
 import java.util.concurrent.atomic.AtomicReference;
 
 import io.reactivex.rxjava3.annotations.NonNull;
 import io.reactivex.rxjava3.core.CompletableObserver;
 import io.reactivex.rxjava3.disposables.Disposable;
 import io.reactivex.rxjava3.internal.disposables.*;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.internal.util.EndConsumerHelper;
 
 /**
@@ -87,7 +87,7 @@ public abstract class ResourceCompletableObserver implements CompletableObserver
      * @throws NullPointerException if resource is null
      */
     public final void add(@NonNull Disposable resource) {
-        ObjectHelper.requireNonNull(resource, "resource is null");
+        Objects.requireNonNull(resource, "resource is null");
         resources.add(resource);
     }
 
diff --git a/src/main/java/io/reactivex/rxjava3/observers/ResourceMaybeObserver.java b/src/main/java/io/reactivex/rxjava3/observers/ResourceMaybeObserver.java
index f824d3c97a..cb42a70fbd 100644
--- a/src/main/java/io/reactivex/rxjava3/observers/ResourceMaybeObserver.java
+++ b/src/main/java/io/reactivex/rxjava3/observers/ResourceMaybeObserver.java
@@ -13,13 +13,13 @@
 
 package io.reactivex.rxjava3.observers;
 
+import java.util.Objects;
 import java.util.concurrent.atomic.AtomicReference;
 
 import io.reactivex.rxjava3.annotations.NonNull;
 import io.reactivex.rxjava3.core.MaybeObserver;
 import io.reactivex.rxjava3.disposables.Disposable;
 import io.reactivex.rxjava3.internal.disposables.*;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.internal.util.EndConsumerHelper;
 
 /**
@@ -97,7 +97,7 @@ public abstract class ResourceMaybeObserver<T> implements MaybeObserver<T>, Disp
      * @throws NullPointerException if resource is null
      */
     public final void add(@NonNull Disposable resource) {
-        ObjectHelper.requireNonNull(resource, "resource is null");
+        Objects.requireNonNull(resource, "resource is null");
         resources.add(resource);
     }
 
diff --git a/src/main/java/io/reactivex/rxjava3/observers/ResourceObserver.java b/src/main/java/io/reactivex/rxjava3/observers/ResourceObserver.java
index 04f2959595..b6d77a0d5f 100644
--- a/src/main/java/io/reactivex/rxjava3/observers/ResourceObserver.java
+++ b/src/main/java/io/reactivex/rxjava3/observers/ResourceObserver.java
@@ -13,13 +13,13 @@
 
 package io.reactivex.rxjava3.observers;
 
+import java.util.Objects;
 import java.util.concurrent.atomic.AtomicReference;
 
 import io.reactivex.rxjava3.annotations.NonNull;
 import io.reactivex.rxjava3.core.Observer;
 import io.reactivex.rxjava3.disposables.Disposable;
 import io.reactivex.rxjava3.internal.disposables.*;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.internal.util.EndConsumerHelper;
 
 /**
@@ -95,7 +95,7 @@ public abstract class ResourceObserver<T> implements Observer<T>, Disposable {
      * @throws NullPointerException if resource is null
      */
     public final void add(@NonNull Disposable resource) {
-        ObjectHelper.requireNonNull(resource, "resource is null");
+        Objects.requireNonNull(resource, "resource is null");
         resources.add(resource);
     }
 
diff --git a/src/main/java/io/reactivex/rxjava3/observers/ResourceSingleObserver.java b/src/main/java/io/reactivex/rxjava3/observers/ResourceSingleObserver.java
index fe8075f75a..af723bf789 100644
--- a/src/main/java/io/reactivex/rxjava3/observers/ResourceSingleObserver.java
+++ b/src/main/java/io/reactivex/rxjava3/observers/ResourceSingleObserver.java
@@ -13,13 +13,13 @@
 
 package io.reactivex.rxjava3.observers;
 
+import java.util.Objects;
 import java.util.concurrent.atomic.AtomicReference;
 
 import io.reactivex.rxjava3.annotations.NonNull;
 import io.reactivex.rxjava3.core.SingleObserver;
 import io.reactivex.rxjava3.disposables.Disposable;
 import io.reactivex.rxjava3.internal.disposables.*;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.internal.util.EndConsumerHelper;
 
 /**
@@ -90,7 +90,7 @@ public abstract class ResourceSingleObserver<T> implements SingleObserver<T>, Di
      * @throws NullPointerException if resource is null
      */
     public final void add(@NonNull Disposable resource) {
-        ObjectHelper.requireNonNull(resource, "resource is null");
+        Objects.requireNonNull(resource, "resource is null");
         resources.add(resource);
     }
 
diff --git a/src/main/java/io/reactivex/rxjava3/parallel/ParallelFlowable.java b/src/main/java/io/reactivex/rxjava3/parallel/ParallelFlowable.java
index 38d3505337..afa2eddcf0 100644
--- a/src/main/java/io/reactivex/rxjava3/parallel/ParallelFlowable.java
+++ b/src/main/java/io/reactivex/rxjava3/parallel/ParallelFlowable.java
@@ -113,7 +113,7 @@ public static <T> ParallelFlowable<T> from(@NonNull Publisher<? extends T> sourc
     @NonNull
     public static <T> ParallelFlowable<T> from(@NonNull Publisher<? extends T> source,
             int parallelism, int prefetch) {
-        ObjectHelper.requireNonNull(source, "source");
+        Objects.requireNonNull(source, "source");
         ObjectHelper.verifyPositive(parallelism, "parallelism");
         ObjectHelper.verifyPositive(prefetch, "prefetch");
 
@@ -131,7 +131,7 @@ public static <T> ParallelFlowable<T> from(@NonNull Publisher<? extends T> sourc
     @CheckReturnValue
     @NonNull
     public final <R> ParallelFlowable<R> map(@NonNull Function<? super T, ? extends R> mapper) {
-        ObjectHelper.requireNonNull(mapper, "mapper");
+        Objects.requireNonNull(mapper, "mapper");
         return RxJavaPlugins.onAssembly(new ParallelMap<T, R>(this, mapper));
     }
 
@@ -151,8 +151,8 @@ public final <R> ParallelFlowable<R> map(@NonNull Function<? super T, ? extends
     @CheckReturnValue
     @NonNull
     public final <R> ParallelFlowable<R> map(@NonNull Function<? super T, ? extends R> mapper, @NonNull ParallelFailureHandling errorHandler) {
-        ObjectHelper.requireNonNull(mapper, "mapper");
-        ObjectHelper.requireNonNull(errorHandler, "errorHandler is null");
+        Objects.requireNonNull(mapper, "mapper");
+        Objects.requireNonNull(errorHandler, "errorHandler is null");
         return RxJavaPlugins.onAssembly(new ParallelMapTry<T, R>(this, mapper, errorHandler));
     }
 
@@ -173,8 +173,8 @@ public final <R> ParallelFlowable<R> map(@NonNull Function<? super T, ? extends
     @CheckReturnValue
     @NonNull
     public final <R> ParallelFlowable<R> map(@NonNull Function<? super T, ? extends R> mapper, @NonNull BiFunction<? super Long, ? super Throwable, ParallelFailureHandling> errorHandler) {
-        ObjectHelper.requireNonNull(mapper, "mapper");
-        ObjectHelper.requireNonNull(errorHandler, "errorHandler is null");
+        Objects.requireNonNull(mapper, "mapper");
+        Objects.requireNonNull(errorHandler, "errorHandler is null");
         return RxJavaPlugins.onAssembly(new ParallelMapTry<T, R>(this, mapper, errorHandler));
     }
 
@@ -187,7 +187,7 @@ public final <R> ParallelFlowable<R> map(@NonNull Function<? super T, ? extends
      */
     @CheckReturnValue
     public final ParallelFlowable<T> filter(@NonNull Predicate<? super T> predicate) {
-        ObjectHelper.requireNonNull(predicate, "predicate");
+        Objects.requireNonNull(predicate, "predicate");
         return RxJavaPlugins.onAssembly(new ParallelFilter<T>(this, predicate));
     }
 
@@ -205,8 +205,8 @@ public final ParallelFlowable<T> filter(@NonNull Predicate<? super T> predicate)
      */
     @CheckReturnValue
     public final ParallelFlowable<T> filter(@NonNull Predicate<? super T> predicate, @NonNull ParallelFailureHandling errorHandler) {
-        ObjectHelper.requireNonNull(predicate, "predicate");
-        ObjectHelper.requireNonNull(errorHandler, "errorHandler is null");
+        Objects.requireNonNull(predicate, "predicate");
+        Objects.requireNonNull(errorHandler, "errorHandler is null");
         return RxJavaPlugins.onAssembly(new ParallelFilterTry<T>(this, predicate, errorHandler));
     }
 
@@ -225,8 +225,8 @@ public final ParallelFlowable<T> filter(@NonNull Predicate<? super T> predicate,
      */
     @CheckReturnValue
     public final ParallelFlowable<T> filter(@NonNull Predicate<? super T> predicate, @NonNull BiFunction<? super Long, ? super Throwable, ParallelFailureHandling> errorHandler) {
-        ObjectHelper.requireNonNull(predicate, "predicate");
-        ObjectHelper.requireNonNull(errorHandler, "errorHandler is null");
+        Objects.requireNonNull(predicate, "predicate");
+        Objects.requireNonNull(errorHandler, "errorHandler is null");
         return RxJavaPlugins.onAssembly(new ParallelFilterTry<T>(this, predicate, errorHandler));
     }
 
@@ -279,7 +279,7 @@ public final ParallelFlowable<T> runOn(@NonNull Scheduler scheduler) {
     @CheckReturnValue
     @NonNull
     public final ParallelFlowable<T> runOn(@NonNull Scheduler scheduler, int prefetch) {
-        ObjectHelper.requireNonNull(scheduler, "scheduler");
+        Objects.requireNonNull(scheduler, "scheduler");
         ObjectHelper.verifyPositive(prefetch, "prefetch");
         return RxJavaPlugins.onAssembly(new ParallelRunOn<T>(this, scheduler, prefetch));
     }
@@ -295,7 +295,7 @@ public final ParallelFlowable<T> runOn(@NonNull Scheduler scheduler, int prefetc
     @CheckReturnValue
     @NonNull
     public final Flowable<T> reduce(@NonNull BiFunction<T, T, T> reducer) {
-        ObjectHelper.requireNonNull(reducer, "reducer");
+        Objects.requireNonNull(reducer, "reducer");
         return RxJavaPlugins.onAssembly(new ParallelReduceFull<T>(this, reducer));
     }
 
@@ -313,8 +313,8 @@ public final Flowable<T> reduce(@NonNull BiFunction<T, T, T> reducer) {
     @CheckReturnValue
     @NonNull
     public final <R> ParallelFlowable<R> reduce(@NonNull Supplier<R> initialSupplier, @NonNull BiFunction<R, ? super T, R> reducer) {
-        ObjectHelper.requireNonNull(initialSupplier, "initialSupplier");
-        ObjectHelper.requireNonNull(reducer, "reducer");
+        Objects.requireNonNull(initialSupplier, "initialSupplier");
+        Objects.requireNonNull(reducer, "reducer");
         return RxJavaPlugins.onAssembly(new ParallelReduce<T, R>(this, initialSupplier, reducer));
     }
 
@@ -449,7 +449,7 @@ public final Flowable<T> sorted(@NonNull Comparator<? super T> comparator) {
     @CheckReturnValue
     @NonNull
     public final Flowable<T> sorted(@NonNull Comparator<? super T> comparator, int capacityHint) {
-        ObjectHelper.requireNonNull(comparator, "comparator is null");
+        Objects.requireNonNull(comparator, "comparator is null");
         ObjectHelper.verifyPositive(capacityHint, "capacityHint");
         int ch = capacityHint / parallelism() + 1;
         ParallelFlowable<List<T>> railReduced = reduce(Functions.<T>createArrayList(ch), ListAddBiConsumer.<T>instance());
@@ -483,7 +483,7 @@ public final Flowable<List<T>> toSortedList(@NonNull Comparator<? super T> compa
     @CheckReturnValue
     @NonNull
     public final Flowable<List<T>> toSortedList(@NonNull Comparator<? super T> comparator, int capacityHint) {
-        ObjectHelper.requireNonNull(comparator, "comparator is null");
+        Objects.requireNonNull(comparator, "comparator is null");
         ObjectHelper.verifyPositive(capacityHint, "capacityHint");
 
         int ch = capacityHint / parallelism() + 1;
@@ -504,7 +504,7 @@ public final Flowable<List<T>> toSortedList(@NonNull Comparator<? super T> compa
     @CheckReturnValue
     @NonNull
     public final ParallelFlowable<T> doOnNext(@NonNull Consumer<? super T> onNext) {
-        ObjectHelper.requireNonNull(onNext, "onNext is null");
+        Objects.requireNonNull(onNext, "onNext is null");
         return RxJavaPlugins.onAssembly(new ParallelPeek<T>(this,
                 onNext,
                 Functions.emptyConsumer(),
@@ -530,8 +530,8 @@ public final ParallelFlowable<T> doOnNext(@NonNull Consumer<? super T> onNext) {
     @CheckReturnValue
     @NonNull
     public final ParallelFlowable<T> doOnNext(@NonNull Consumer<? super T> onNext, @NonNull ParallelFailureHandling errorHandler) {
-        ObjectHelper.requireNonNull(onNext, "onNext is null");
-        ObjectHelper.requireNonNull(errorHandler, "errorHandler is null");
+        Objects.requireNonNull(onNext, "onNext is null");
+        Objects.requireNonNull(errorHandler, "errorHandler is null");
         return RxJavaPlugins.onAssembly(new ParallelDoOnNextTry<T>(this, onNext, errorHandler));
     }
 
@@ -549,8 +549,8 @@ public final ParallelFlowable<T> doOnNext(@NonNull Consumer<? super T> onNext, @
     @CheckReturnValue
     @NonNull
     public final ParallelFlowable<T> doOnNext(@NonNull Consumer<? super T> onNext, @NonNull BiFunction<? super Long, ? super Throwable, ParallelFailureHandling> errorHandler) {
-        ObjectHelper.requireNonNull(onNext, "onNext is null");
-        ObjectHelper.requireNonNull(errorHandler, "errorHandler is null");
+        Objects.requireNonNull(onNext, "onNext is null");
+        Objects.requireNonNull(errorHandler, "errorHandler is null");
         return RxJavaPlugins.onAssembly(new ParallelDoOnNextTry<T>(this, onNext, errorHandler));
     }
 
@@ -564,7 +564,7 @@ public final ParallelFlowable<T> doOnNext(@NonNull Consumer<? super T> onNext, @
     @CheckReturnValue
     @NonNull
     public final ParallelFlowable<T> doAfterNext(@NonNull Consumer<? super T> onAfterNext) {
-        ObjectHelper.requireNonNull(onAfterNext, "onAfterNext is null");
+        Objects.requireNonNull(onAfterNext, "onAfterNext is null");
         return RxJavaPlugins.onAssembly(new ParallelPeek<T>(this,
                 Functions.emptyConsumer(),
                 onAfterNext,
@@ -586,7 +586,7 @@ public final ParallelFlowable<T> doAfterNext(@NonNull Consumer<? super T> onAfte
     @CheckReturnValue
     @NonNull
     public final ParallelFlowable<T> doOnError(@NonNull Consumer<Throwable> onError) {
-        ObjectHelper.requireNonNull(onError, "onError is null");
+        Objects.requireNonNull(onError, "onError is null");
         return RxJavaPlugins.onAssembly(new ParallelPeek<T>(this,
                 Functions.emptyConsumer(),
                 Functions.emptyConsumer(),
@@ -608,7 +608,7 @@ public final ParallelFlowable<T> doOnError(@NonNull Consumer<Throwable> onError)
     @CheckReturnValue
     @NonNull
     public final ParallelFlowable<T> doOnComplete(@NonNull Action onComplete) {
-        ObjectHelper.requireNonNull(onComplete, "onComplete is null");
+        Objects.requireNonNull(onComplete, "onComplete is null");
         return RxJavaPlugins.onAssembly(new ParallelPeek<T>(this,
                 Functions.emptyConsumer(),
                 Functions.emptyConsumer(),
@@ -630,7 +630,7 @@ public final ParallelFlowable<T> doOnComplete(@NonNull Action onComplete) {
     @CheckReturnValue
     @NonNull
     public final ParallelFlowable<T> doAfterTerminated(@NonNull Action onAfterTerminate) {
-        ObjectHelper.requireNonNull(onAfterTerminate, "onAfterTerminate is null");
+        Objects.requireNonNull(onAfterTerminate, "onAfterTerminate is null");
         return RxJavaPlugins.onAssembly(new ParallelPeek<T>(this,
                 Functions.emptyConsumer(),
                 Functions.emptyConsumer(),
@@ -652,7 +652,7 @@ public final ParallelFlowable<T> doAfterTerminated(@NonNull Action onAfterTermin
     @CheckReturnValue
     @NonNull
     public final ParallelFlowable<T> doOnSubscribe(@NonNull Consumer<? super Subscription> onSubscribe) {
-        ObjectHelper.requireNonNull(onSubscribe, "onSubscribe is null");
+        Objects.requireNonNull(onSubscribe, "onSubscribe is null");
         return RxJavaPlugins.onAssembly(new ParallelPeek<T>(this,
                 Functions.emptyConsumer(),
                 Functions.emptyConsumer(),
@@ -674,7 +674,7 @@ public final ParallelFlowable<T> doOnSubscribe(@NonNull Consumer<? super Subscri
     @CheckReturnValue
     @NonNull
     public final ParallelFlowable<T> doOnRequest(@NonNull LongConsumer onRequest) {
-        ObjectHelper.requireNonNull(onRequest, "onRequest is null");
+        Objects.requireNonNull(onRequest, "onRequest is null");
         return RxJavaPlugins.onAssembly(new ParallelPeek<T>(this,
                 Functions.emptyConsumer(),
                 Functions.emptyConsumer(),
@@ -696,7 +696,7 @@ public final ParallelFlowable<T> doOnRequest(@NonNull LongConsumer onRequest) {
     @CheckReturnValue
     @NonNull
     public final ParallelFlowable<T> doOnCancel(@NonNull Action onCancel) {
-        ObjectHelper.requireNonNull(onCancel, "onCancel is null");
+        Objects.requireNonNull(onCancel, "onCancel is null");
         return RxJavaPlugins.onAssembly(new ParallelPeek<T>(this,
                 Functions.emptyConsumer(),
                 Functions.emptyConsumer(),
@@ -721,8 +721,8 @@ public final ParallelFlowable<T> doOnCancel(@NonNull Action onCancel) {
     @CheckReturnValue
     @NonNull
     public final <C> ParallelFlowable<C> collect(@NonNull Supplier<? extends C> collectionSupplier, @NonNull BiConsumer<? super C, ? super T> collector) {
-        ObjectHelper.requireNonNull(collectionSupplier, "collectionSupplier is null");
-        ObjectHelper.requireNonNull(collector, "collector is null");
+        Objects.requireNonNull(collectionSupplier, "collectionSupplier is null");
+        Objects.requireNonNull(collector, "collector is null");
         return RxJavaPlugins.onAssembly(new ParallelCollect<T, C>(this, collectionSupplier, collector));
     }
 
@@ -757,7 +757,7 @@ public static <T> ParallelFlowable<T> fromArray(@NonNull Publisher<T>... publish
     @CheckReturnValue
     @NonNull
     public final <R> R to(@NonNull ParallelFlowableConverter<T, R> converter) {
-        return ObjectHelper.requireNonNull(converter, "converter is null").apply(this);
+        return Objects.requireNonNull(converter, "converter is null").apply(this);
     }
 
     /**
@@ -771,7 +771,7 @@ public final <R> R to(@NonNull ParallelFlowableConverter<T, R> converter) {
     @CheckReturnValue
     @NonNull
     public final <U> ParallelFlowable<U> compose(@NonNull ParallelTransformer<T, U> composer) {
-        return RxJavaPlugins.onAssembly(ObjectHelper.requireNonNull(composer, "composer is null").apply(this));
+        return RxJavaPlugins.onAssembly(Objects.requireNonNull(composer, "composer is null").apply(this));
     }
 
     /**
@@ -842,7 +842,7 @@ public final <R> ParallelFlowable<R> flatMap(
     public final <R> ParallelFlowable<R> flatMap(
             @NonNull Function<? super T, ? extends Publisher<? extends R>> mapper,
             boolean delayError, int maxConcurrency, int prefetch) {
-        ObjectHelper.requireNonNull(mapper, "mapper is null");
+        Objects.requireNonNull(mapper, "mapper is null");
         ObjectHelper.verifyPositive(maxConcurrency, "maxConcurrency");
         ObjectHelper.verifyPositive(prefetch, "prefetch");
         return RxJavaPlugins.onAssembly(new ParallelFlatMap<T, R>(this, mapper, delayError, maxConcurrency, prefetch));
@@ -879,7 +879,7 @@ public final <R> ParallelFlowable<R> concatMap(
     public final <R> ParallelFlowable<R> concatMap(
             @NonNull Function<? super T, ? extends Publisher<? extends R>> mapper,
                     int prefetch) {
-        ObjectHelper.requireNonNull(mapper, "mapper is null");
+        Objects.requireNonNull(mapper, "mapper is null");
         ObjectHelper.verifyPositive(prefetch, "prefetch");
         return RxJavaPlugins.onAssembly(new ParallelConcatMap<T, R>(this, mapper, prefetch, ErrorMode.IMMEDIATE));
     }
@@ -919,7 +919,7 @@ public final <R> ParallelFlowable<R> concatMapDelayError(
     public final <R> ParallelFlowable<R> concatMapDelayError(
             @NonNull Function<? super T, ? extends Publisher<? extends R>> mapper,
                     int prefetch, boolean tillTheEnd) {
-        ObjectHelper.requireNonNull(mapper, "mapper is null");
+        Objects.requireNonNull(mapper, "mapper is null");
         ObjectHelper.verifyPositive(prefetch, "prefetch");
         return RxJavaPlugins.onAssembly(new ParallelConcatMap<T, R>(
                 this, mapper, prefetch, tillTheEnd ? ErrorMode.END : ErrorMode.BOUNDARY));
diff --git a/src/main/java/io/reactivex/rxjava3/plugins/RxJavaPlugins.java b/src/main/java/io/reactivex/rxjava3/plugins/RxJavaPlugins.java
index 976289c542..9012e36f12 100644
--- a/src/main/java/io/reactivex/rxjava3/plugins/RxJavaPlugins.java
+++ b/src/main/java/io/reactivex/rxjava3/plugins/RxJavaPlugins.java
@@ -13,6 +13,7 @@
 package io.reactivex.rxjava3.plugins;
 
 import java.lang.Thread.UncaughtExceptionHandler;
+import java.util.Objects;
 import java.util.concurrent.ThreadFactory;
 
 import org.reactivestreams.Subscriber;
@@ -22,7 +23,6 @@
 import io.reactivex.rxjava3.exceptions.*;
 import io.reactivex.rxjava3.flowables.ConnectableFlowable;
 import io.reactivex.rxjava3.functions.*;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.internal.schedulers.*;
 import io.reactivex.rxjava3.internal.util.ExceptionHelper;
 import io.reactivex.rxjava3.observables.ConnectableObservable;
@@ -266,7 +266,7 @@ public static Consumer<? super Throwable> getErrorHandler() {
      */
     @NonNull
     public static Scheduler initComputationScheduler(@NonNull Supplier<Scheduler> defaultScheduler) {
-        ObjectHelper.requireNonNull(defaultScheduler, "Scheduler Supplier can't be null");
+        Objects.requireNonNull(defaultScheduler, "Scheduler Supplier can't be null");
         Function<? super Supplier<Scheduler>, ? extends Scheduler> f = onInitComputationHandler;
         if (f == null) {
             return callRequireNonNull(defaultScheduler);
@@ -282,7 +282,7 @@ public static Scheduler initComputationScheduler(@NonNull Supplier<Scheduler> de
      */
     @NonNull
     public static Scheduler initIoScheduler(@NonNull Supplier<Scheduler> defaultScheduler) {
-        ObjectHelper.requireNonNull(defaultScheduler, "Scheduler Supplier can't be null");
+        Objects.requireNonNull(defaultScheduler, "Scheduler Supplier can't be null");
         Function<? super Supplier<Scheduler>, ? extends Scheduler> f = onInitIoHandler;
         if (f == null) {
             return callRequireNonNull(defaultScheduler);
@@ -298,7 +298,7 @@ public static Scheduler initIoScheduler(@NonNull Supplier<Scheduler> defaultSche
      */
     @NonNull
     public static Scheduler initNewThreadScheduler(@NonNull Supplier<Scheduler> defaultScheduler) {
-        ObjectHelper.requireNonNull(defaultScheduler, "Scheduler Supplier can't be null");
+        Objects.requireNonNull(defaultScheduler, "Scheduler Supplier can't be null");
         Function<? super Supplier<Scheduler>, ? extends Scheduler> f = onInitNewThreadHandler;
         if (f == null) {
             return callRequireNonNull(defaultScheduler);
@@ -314,7 +314,7 @@ public static Scheduler initNewThreadScheduler(@NonNull Supplier<Scheduler> defa
      */
     @NonNull
     public static Scheduler initSingleScheduler(@NonNull Supplier<Scheduler> defaultScheduler) {
-        ObjectHelper.requireNonNull(defaultScheduler, "Scheduler Supplier can't be null");
+        Objects.requireNonNull(defaultScheduler, "Scheduler Supplier can't be null");
         Function<? super Supplier<Scheduler>, ? extends Scheduler> f = onInitSingleHandler;
         if (f == null) {
             return callRequireNonNull(defaultScheduler);
@@ -464,7 +464,7 @@ public static Scheduler onNewThreadScheduler(@NonNull Scheduler defaultScheduler
      */
     @NonNull
     public static Runnable onSchedule(@NonNull Runnable run) {
-        ObjectHelper.requireNonNull(run, "run is null");
+        Objects.requireNonNull(run, "run is null");
 
         Function<? super Runnable, ? extends Runnable> f = onScheduleHandler;
         if (f == null) {
@@ -1208,7 +1208,7 @@ public static BooleanSupplier getOnBeforeBlocking() {
      */
     @NonNull
     public static Scheduler createComputationScheduler(@NonNull ThreadFactory threadFactory) {
-        return new ComputationScheduler(ObjectHelper.requireNonNull(threadFactory, "threadFactory is null"));
+        return new ComputationScheduler(Objects.requireNonNull(threadFactory, "threadFactory is null"));
     }
 
     /**
@@ -1222,7 +1222,7 @@ public static Scheduler createComputationScheduler(@NonNull ThreadFactory thread
      */
     @NonNull
     public static Scheduler createIoScheduler(@NonNull ThreadFactory threadFactory) {
-        return new IoScheduler(ObjectHelper.requireNonNull(threadFactory, "threadFactory is null"));
+        return new IoScheduler(Objects.requireNonNull(threadFactory, "threadFactory is null"));
     }
 
     /**
@@ -1236,7 +1236,7 @@ public static Scheduler createIoScheduler(@NonNull ThreadFactory threadFactory)
      */
     @NonNull
     public static Scheduler createNewThreadScheduler(@NonNull ThreadFactory threadFactory) {
-        return new NewThreadScheduler(ObjectHelper.requireNonNull(threadFactory, "threadFactory is null"));
+        return new NewThreadScheduler(Objects.requireNonNull(threadFactory, "threadFactory is null"));
     }
 
     /**
@@ -1250,7 +1250,7 @@ public static Scheduler createNewThreadScheduler(@NonNull ThreadFactory threadFa
      */
     @NonNull
     public static Scheduler createSingleScheduler(@NonNull ThreadFactory threadFactory) {
-        return new SingleScheduler(ObjectHelper.requireNonNull(threadFactory, "threadFactory is null"));
+        return new SingleScheduler(Objects.requireNonNull(threadFactory, "threadFactory is null"));
     }
 
     /**
@@ -1301,7 +1301,7 @@ static <T, U, R> R apply(@NonNull BiFunction<T, U, R> f, @NonNull T t, @NonNull
     @NonNull
     static Scheduler callRequireNonNull(@NonNull Supplier<Scheduler> s) {
         try {
-            return ObjectHelper.requireNonNull(s.get(), "Scheduler Supplier result can't be null");
+            return Objects.requireNonNull(s.get(), "Scheduler Supplier result can't be null");
         } catch (Throwable ex) {
             throw ExceptionHelper.wrapOrThrow(ex);
         }
@@ -1317,7 +1317,7 @@ static Scheduler callRequireNonNull(@NonNull Supplier<Scheduler> s) {
      */
     @NonNull
     static Scheduler applyRequireNonNull(@NonNull Function<? super Supplier<Scheduler>, ? extends Scheduler> f, Supplier<Scheduler> s) {
-        return ObjectHelper.requireNonNull(apply(f, s), "Scheduler Supplier result can't be null");
+        return Objects.requireNonNull(apply(f, s), "Scheduler Supplier result can't be null");
     }
 
     /** Helper class, no instances. */
diff --git a/src/main/java/io/reactivex/rxjava3/processors/BehaviorProcessor.java b/src/main/java/io/reactivex/rxjava3/processors/BehaviorProcessor.java
index 5ac1d1d607..eaf47ecae3 100644
--- a/src/main/java/io/reactivex/rxjava3/processors/BehaviorProcessor.java
+++ b/src/main/java/io/reactivex/rxjava3/processors/BehaviorProcessor.java
@@ -13,6 +13,7 @@
 
 package io.reactivex.rxjava3.processors;
 
+import java.util.Objects;
 import java.util.concurrent.atomic.*;
 import java.util.concurrent.locks.*;
 
@@ -20,7 +21,6 @@
 
 import io.reactivex.rxjava3.annotations.*;
 import io.reactivex.rxjava3.exceptions.MissingBackpressureException;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.internal.subscriptions.SubscriptionHelper;
 import io.reactivex.rxjava3.internal.util.*;
 import io.reactivex.rxjava3.internal.util.AppendOnlyLinkedArrayList.NonThrowingPredicate;
@@ -208,7 +208,7 @@ public static <T> BehaviorProcessor<T> create() {
     @CheckReturnValue
     @NonNull
     public static <T> BehaviorProcessor<T> createDefault(T defaultValue) {
-        ObjectHelper.requireNonNull(defaultValue, "defaultValue is null");
+        Objects.requireNonNull(defaultValue, "defaultValue is null");
         return new BehaviorProcessor<T>(defaultValue);
     }
 
@@ -234,7 +234,7 @@ public static <T> BehaviorProcessor<T> createDefault(T defaultValue) {
      */
     BehaviorProcessor(T defaultValue) {
         this();
-        this.value.lazySet(ObjectHelper.requireNonNull(defaultValue, "defaultValue is null"));
+        this.value.lazySet(Objects.requireNonNull(defaultValue, "defaultValue is null"));
     }
 
     @Override
diff --git a/src/main/java/io/reactivex/rxjava3/processors/ReplayProcessor.java b/src/main/java/io/reactivex/rxjava3/processors/ReplayProcessor.java
index 1ab964a6dd..fcd2cb913f 100644
--- a/src/main/java/io/reactivex/rxjava3/processors/ReplayProcessor.java
+++ b/src/main/java/io/reactivex/rxjava3/processors/ReplayProcessor.java
@@ -1052,8 +1052,8 @@ static final class SizeAndTimeBoundReplayBuffer<T>
         SizeAndTimeBoundReplayBuffer(int maxSize, long maxAge, TimeUnit unit, Scheduler scheduler) {
             this.maxSize = ObjectHelper.verifyPositive(maxSize, "maxSize");
             this.maxAge = ObjectHelper.verifyPositive(maxAge, "maxAge");
-            this.unit = ObjectHelper.requireNonNull(unit, "unit is null");
-            this.scheduler = ObjectHelper.requireNonNull(scheduler, "scheduler is null");
+            this.unit = Objects.requireNonNull(unit, "unit is null");
+            this.scheduler = Objects.requireNonNull(scheduler, "scheduler is null");
             TimedNode<T> h = new TimedNode<T>(null, 0L);
             this.tail = h;
             this.head = h;
diff --git a/src/main/java/io/reactivex/rxjava3/processors/UnicastProcessor.java b/src/main/java/io/reactivex/rxjava3/processors/UnicastProcessor.java
index a3715103d5..4a1862a95f 100644
--- a/src/main/java/io/reactivex/rxjava3/processors/UnicastProcessor.java
+++ b/src/main/java/io/reactivex/rxjava3/processors/UnicastProcessor.java
@@ -13,6 +13,7 @@
 
 package io.reactivex.rxjava3.processors;
 
+import java.util.Objects;
 import java.util.concurrent.atomic.*;
 
 import org.reactivestreams.*;
@@ -222,7 +223,7 @@ public static <T> UnicastProcessor<T> create(boolean delayError) {
     @CheckReturnValue
     @NonNull
     public static <T> UnicastProcessor<T> create(int capacityHint, Runnable onCancelled) {
-        ObjectHelper.requireNonNull(onCancelled, "onTerminate");
+        Objects.requireNonNull(onCancelled, "onTerminate");
         return new UnicastProcessor<T>(capacityHint, onCancelled);
     }
 
@@ -243,7 +244,7 @@ public static <T> UnicastProcessor<T> create(int capacityHint, Runnable onCancel
     @CheckReturnValue
     @NonNull
     public static <T> UnicastProcessor<T> create(int capacityHint, Runnable onCancelled, boolean delayError) {
-        ObjectHelper.requireNonNull(onCancelled, "onTerminate");
+        Objects.requireNonNull(onCancelled, "onTerminate");
         return new UnicastProcessor<T>(capacityHint, onCancelled, delayError);
     }
 
diff --git a/src/main/java/io/reactivex/rxjava3/schedulers/Timed.java b/src/main/java/io/reactivex/rxjava3/schedulers/Timed.java
index fff21ad682..845273ff22 100644
--- a/src/main/java/io/reactivex/rxjava3/schedulers/Timed.java
+++ b/src/main/java/io/reactivex/rxjava3/schedulers/Timed.java
@@ -17,7 +17,6 @@
 import java.util.concurrent.TimeUnit;
 
 import io.reactivex.rxjava3.annotations.NonNull;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 
 /**
  * Holds onto a value along with time information.
@@ -39,7 +38,7 @@ public final class Timed<T> {
     public Timed(@NonNull T value, long time, @NonNull TimeUnit unit) {
         this.value = value;
         this.time = time;
-        this.unit = ObjectHelper.requireNonNull(unit, "unit is null");
+        this.unit = Objects.requireNonNull(unit, "unit is null");
     }
 
     /**
diff --git a/src/main/java/io/reactivex/rxjava3/subjects/BehaviorSubject.java b/src/main/java/io/reactivex/rxjava3/subjects/BehaviorSubject.java
index 45ddb72a51..68efd5bf8f 100644
--- a/src/main/java/io/reactivex/rxjava3/subjects/BehaviorSubject.java
+++ b/src/main/java/io/reactivex/rxjava3/subjects/BehaviorSubject.java
@@ -13,13 +13,13 @@
 
 package io.reactivex.rxjava3.subjects;
 
+import java.util.Objects;
 import java.util.concurrent.atomic.AtomicReference;
 import java.util.concurrent.locks.*;
 
 import io.reactivex.rxjava3.annotations.*;
 import io.reactivex.rxjava3.core.Observer;
 import io.reactivex.rxjava3.disposables.Disposable;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.internal.util.*;
 import io.reactivex.rxjava3.internal.util.AppendOnlyLinkedArrayList.NonThrowingPredicate;
 import io.reactivex.rxjava3.plugins.RxJavaPlugins;
@@ -218,7 +218,7 @@ public static <T> BehaviorSubject<T> createDefault(T defaultValue) {
      */
     BehaviorSubject(T defaultValue) {
         this();
-        this.value.lazySet(ObjectHelper.requireNonNull(defaultValue, "defaultValue is null"));
+        this.value.lazySet(Objects.requireNonNull(defaultValue, "defaultValue is null"));
     }
 
     @Override
diff --git a/src/main/java/io/reactivex/rxjava3/subjects/ReplaySubject.java b/src/main/java/io/reactivex/rxjava3/subjects/ReplaySubject.java
index 2d9dbe779a..aad2092429 100644
--- a/src/main/java/io/reactivex/rxjava3/subjects/ReplaySubject.java
+++ b/src/main/java/io/reactivex/rxjava3/subjects/ReplaySubject.java
@@ -1053,8 +1053,8 @@ static final class SizeAndTimeBoundReplayBuffer<T>
         SizeAndTimeBoundReplayBuffer(int maxSize, long maxAge, TimeUnit unit, Scheduler scheduler) {
             this.maxSize = ObjectHelper.verifyPositive(maxSize, "maxSize");
             this.maxAge = ObjectHelper.verifyPositive(maxAge, "maxAge");
-            this.unit = ObjectHelper.requireNonNull(unit, "unit is null");
-            this.scheduler = ObjectHelper.requireNonNull(scheduler, "scheduler is null");
+            this.unit = Objects.requireNonNull(unit, "unit is null");
+            this.scheduler = Objects.requireNonNull(scheduler, "scheduler is null");
             TimedNode<Object> h = new TimedNode<Object>(null, 0L);
             this.tail = h;
             this.head = h;
diff --git a/src/main/java/io/reactivex/rxjava3/subjects/UnicastSubject.java b/src/main/java/io/reactivex/rxjava3/subjects/UnicastSubject.java
index be824a7708..c522343aed 100644
--- a/src/main/java/io/reactivex/rxjava3/subjects/UnicastSubject.java
+++ b/src/main/java/io/reactivex/rxjava3/subjects/UnicastSubject.java
@@ -13,6 +13,7 @@
 
 package io.reactivex.rxjava3.subjects;
 
+import java.util.Objects;
 import java.util.concurrent.atomic.*;
 
 import io.reactivex.rxjava3.annotations.*;
@@ -288,7 +289,7 @@ public static <T> UnicastSubject<T> create(boolean delayError) {
      */
     UnicastSubject(int capacityHint, Runnable onTerminate, boolean delayError) {
         this.queue = new SpscLinkedArrayQueue<T>(ObjectHelper.verifyPositive(capacityHint, "capacityHint"));
-        this.onTerminate = new AtomicReference<Runnable>(ObjectHelper.requireNonNull(onTerminate, "onTerminate"));
+        this.onTerminate = new AtomicReference<Runnable>(Objects.requireNonNull(onTerminate, "onTerminate"));
         this.delayError = delayError;
         this.downstream = new AtomicReference<Observer<? super T>>();
         this.once = new AtomicBoolean();
diff --git a/src/main/java/io/reactivex/rxjava3/subscribers/ResourceSubscriber.java b/src/main/java/io/reactivex/rxjava3/subscribers/ResourceSubscriber.java
index 71bdeb0121..1990939311 100644
--- a/src/main/java/io/reactivex/rxjava3/subscribers/ResourceSubscriber.java
+++ b/src/main/java/io/reactivex/rxjava3/subscribers/ResourceSubscriber.java
@@ -13,6 +13,7 @@
 
 package io.reactivex.rxjava3.subscribers;
 
+import java.util.Objects;
 import java.util.concurrent.atomic.*;
 
 import org.reactivestreams.Subscription;
@@ -20,7 +21,6 @@
 import io.reactivex.rxjava3.core.FlowableSubscriber;
 import io.reactivex.rxjava3.disposables.Disposable;
 import io.reactivex.rxjava3.internal.disposables.ListCompositeDisposable;
-import io.reactivex.rxjava3.internal.functions.ObjectHelper;
 import io.reactivex.rxjava3.internal.subscriptions.SubscriptionHelper;
 import io.reactivex.rxjava3.internal.util.EndConsumerHelper;
 
@@ -110,7 +110,7 @@ public abstract class ResourceSubscriber<T> implements FlowableSubscriber<T>, Di
      * @throws NullPointerException if resource is null
      */
     public final void add(Disposable resource) {
-        ObjectHelper.requireNonNull(resource, "resource is null");
+        Objects.requireNonNull(resource, "resource is null");
         resources.add(resource);
     }