IOException ioe = new IOException();
ExceptionCallback cb5 = new ExceptionCallback(appContext, ioe, ioe);
//
ServletContextDispatcher dispatcher = new ServletContextDispatcher(req, resp, container);
DriverResponse response = cb1.test(null, dispatcher);
response = cb2.test(response, dispatcher);
response = cb3.test(response, dispatcher);
response = cb4.test(response, dispatcher);
response = cb5.test(response, dispatcher);