While preparing a demo with DevStudio, I created my JAX-RS RestApplication class and other endpoints using the JAX-RS Resource wizard (from the 'Webservices' component).
Then I wanted to use Forge to scaffold the UI with AngularJS, but during the 'scaffold setup' phase, the wizard did not allow me to skip the RestApplication class creation despite I already had one. I think this should be permitted, and it might also be useful to users who rely on non-JavaEE compliant implementation, ie, with custom servlet dispatchers.