You can explicitly set a timeout for Async calls in gwt.  Once a
RequestBuilder object  is created, you can add setTimeoutMillis()
method in RequestBuilder  header object.  Sets the number of
milliseconds to wait for a request to complete.  Should the request
timeout, the RequestCallback.onError(Request, Throwable) method will
be called in RequestCallback interface.  The callback method will
receive an instance of the RequestTimeoutException class as its
Throwable argument.

S. Abraham
www.DataStoreGwt.com
Persist objects directly in GAE

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