GWT requestbuilder with asynchronous servlet 3.0 - gwt

Question

I have example project StockWatcher using requestbuilder to communicate with servlet (this example). I want to make servlet asynchronous. I have added the following lines to the doGet method:
final AsyncContext ac = request.startAsync();
ac.setTimeout(1 * 60 * 1000);
ac.addListener(new AsyncListener() {
#Override
public void onError(AsyncEvent arg0) throws IOException {
System.out.println("onError");
}
public void onComplete(AsyncEvent event) throws IOException {
System.out.println("onComplete");
queue.remove(ac);
}
public void onTimeout(AsyncEvent event) throws IOException {
System.out.println("onTimeout");
queue.remove(ac);
}
#Override
public void onStartAsync(AsyncEvent arg0) throws IOException {
System.out.println("onStartAsync");
}
});
queue.add(ac);
added asynchronous annotation: #WebServlet(asyncSupported=true)
and changed the rest of doGet method with:
PrintWriter out = ac.getResponse().getWriter();
out.println("Something");
out.flush();
Now there is nothing returning. What do I wrong? Have to change something in client side? Glassfish 3 does not show any errors.

Answer 1

You are not doing anything wrong. GWT uses servlet 2.5 and it blocks if you try something async. I've the same problem right now although I use Vaadin (which uses GWT). A link I've found on the topic: http://comments.gmane.org/gmane.org.google.gwt/48496
There is a page claiming to have the problem solved: http://blog.orange11.nl/2011/02/25/getting-gwt-to-work-with-servlet-3-async-requests/
I have not been able to try this out yet.