Hi,
I am a fresher and have recently started working on GWT and am using
Hibernate(OR Mapping) and connecting with Apache Derby database for a
project.
I faced a common error namely:
An IncompatibleRemoteServiceException was thrown while processing this
call.
com.google.gwt.user.client.rpc.IncompatibleRemoteServiceException:
This application is out of date, please click the refresh button on
your browser. ( Blocked attempt to access interface
'gwtForm.client.AddmemberService', which is not implemented by
'gwtForm.server.SigninImpl'; this is either misconfiguration or a hack
attempt )

Even after trying the suggested solution of using a
WorkAroundException (posted on this group),the error still
persisted.After we simply placed our hibernate.cfg file and xml
mappings in the src folder rather than the  war-WEB-INF folder the RPC
connected properly and the error above error that i was getting was
solved.
So i suggest that you just try to put your database mapping files in
the src folder if nothing else works.

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