Re: how to return errors from RequestFactoryServlet?

u can extends requestfactoryservlet to use your exceptionhandler (which creates ServerFailure), (dont forget to put it in web.xml instead of the default requestfactoryservlet)

when u throw exception on server, onFailure will be called, not exactly Exception/Throwable thou.

there's a post about it in this forum already, just try to search.

On Fri, Apr 1, 2011 at 5:45 AM, KaffeineComa <kaffeinecoma@gmail.com> wrote:

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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