Like the asker of this question:

http://stackoverflow.com/questions/5277084/handling-gwt-requestfactory-server-error-responses

I'd like to be able to return errors to the front-end 
when RequestFactoryServlet encounters a problem.  Thrown exceptions never 
seem to result in onFailure() or onViolation() being called. Instead, 
onSuccess() is called despite the failure.

I also tried 
setting res.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR), but 
that just results in java.lang.IllegalStateException, presumably because 
super.doPost() has already written to the response. (You might wonder why 
I'm running code after super.doPost()- it's because I'm committing and 
closing my EntityManager.) 

What must I do to propagate errors to the front-end? Is there some Exception 
subclass I should throw?

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