This is the final result of a JUG presentation I gave in San Antonio on 2 October. It's an example of developing a simple ReST service in Java using Gradle to build, Groovy+Spock for testing, and JAX-RS 1.1/Jersey to create the ReST endpoint.
You can run the service with gradle run, run the tests and get code coverage with gradle test, or build a distributable zip of the application (including startup scripts and dependencies) with gradle distZip.
In the presentation, I used the zip file to deploy the service to OpenShift, the RedHat PaaS provider. You can do so, too, by creating a free account and adding a "Do It Yourself" application. Then follow the instructions to clone the OpenShift project and modify the start script to call the app's startup script, passing $OPENSHIFT_INTERNAL_IP and $OPENSHIFT_INTERNAL_PORT as command-line arguments. Make sure to modify the stop script to kill the started process, or you won't be able to redeploy the app after changing it.