There is a bug in the GadgetGenerator in the latest release. To
reproduce, simply have your gadget implement an interface which is not
a feature (e.g. has no @FeatureName), this will throw an NPE, which
will cause the GWT RC2 compiler to croak with no error messages. I've
submitted a patch to fix the compiler, here's a patch to fix the
generator, which is to simply move the writeRequirementsToElement()
call inside the if(name != null) check.
-Ray