You could transparently handle this for all your requests of a given 
GWT-RPC interface by using a custom RpcRequestBuilder. This custom 
RpcRequestBuilder would make 3 request attempts and if all 3 fail, calls 
the onFailure() method.

MyRemoteServiceAsync service = GWT.create(MyRemoteService.class);
((ServiceDefTarget) service).setRpcRequestBuilder(new 
RetryThreeTimesRequestBuilder());

The custom RequestBuilder could also fire a "NetworkFailureEvent" on the 
eventBus if multiple application components may be interested in that 
information. For example you could overlay the whole app with a dark screen 
and periodically try sending Ping requests to your server until network 
comes back online. There is also the onLine HTML 5 property you can check, 
but its not 100% reliable 
(https://developer.mozilla.org/en-US/docs/Web/API/window.navigator.onLine)

-- J.

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