// check the callback operation
CallbackHandler<SleepResponse> sleepCallbackHandler = new CallbackHandler<SleepResponse>();
request1 = req1base + "_with_Callback";
//System.out.println(title+" port.sleepAsync("+request1+", callbackHander) being submitted....");
Future<?> sr = port.sleepAsync(request1, sleepCallbackHandler);
// wait a bit for the server to process the request ...
Thread.sleep(500);
// check the waiting request