Webapp service in Open Liberty

[Kubik42]

@arun-gupta From the old PR:

Added three new profiles: wildfly for starting the service in Wildfly, openliberty for starting the service in Open Liberty, docker-openliberty for building a Docker image for Open Liberty.

To start the service in Wildfly as before, run:

mvn wildfly-swarm:run -P wildfly

To start the service in Open Liberty, run:

mvn install liberty:start-server -P openliberty

Just in case, run the clean goal when switching between runtimes.

New changes:

The src/main/openliberty/config directory contains three files:

• server.xml contains the server configuration. This is where you can enable various features in the server.
• bootstrap.properties contains the runtime variables.
• server.env contains environment variables.

Justification for code changes:

• Added a slash to the url pattern in the web.xml file as outlined in the servlet spec.

• Open Liberty also requires the JavaEE JAX-RS, so hence the reason for adding javax.ws.rs-api dependency and separating the two JAX-RS versions into the two profiles.

• I also made some suggestive changes to WebappController.java. I can change these back if you prefer the old approach.

[Kubik42]

@yeekangc @evelinec @Emily-Jiang

[Kubik42]

Let me know if you need the docker-compose yaml from the old PR.