GWT and async requests (startAsync)

GWT RPC has been thought of as blocking on the server side. Making it async would require changes to the RemoteServiceServlet: most likely the method would be async just like on the client side with the implementation calling the callbacks onSuccess or onFailure.

Your best bet here would be to write a RemoteServiceAsyncServlet by copying from RemoteServiceServlet, hoping for all underlying APIs to be public.
Either that or move off of RPC for that call (future proof)

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