I see that my JBoss Developer Studio contains Forge 1.0.1. (newer version not available yet)
I downloaded and installed Forge 1.0.6.Final.
Glad your problem is solved. Thanks for reporting back!
Glad you got things working - but I think maybe the problem was that you hadn't run rest setup yet? That and depending on your app, earlier versions of Forge didn't recognize Class activators - only XML was supported.
No, that wasn't the case.
I ran rest setup successfully, but wasn't able to run
rest endpoint-from-entity ~.domain.*;