This is not a problem with your code, but rather a suggestion that could make it easier for users to debug their code. In the GWTRPCServiceExporter.java there are some logger.warn statements that do not include the cause exception, and hence the exception stack trace is not displayed in the log file. Is this deliberate?
I have included a patch for the 1.0 branch if you wish to use it.
SVN patch file
Thank you Ananymous, will try it out.
Whom may I quote in the credits? :-)
Added to 1.0 branch