Using servlet API 2.5
eu.webtoolkit.jwt.WtException: Server push requires a Servlet 3.0 enabled servlet container and an application with async-supported enabled.
	at eu.webtoolkit.jwt.WDialog.exec(WDialog.java:304)
	at eu.webtoolkit.jwt.WMessageBox.show(WMessageBox.java:265)
	at eu.webtoolkit.jwt.WMessageBox.show(WMessageBox.java:278)
	at eu.webtoolkit.jwt.examples.simplechat.SimpleChatWidget.logout(SimpleChatWidget.java:253)
	at eu.webtoolkit.jwt.examples.simplechat.SimpleChatWidget.access$3(SimpleChatWidget.java:249)
	at eu.webtoolkit.jwt.examples.simplechat.SimpleChatWidget$6.trigger(SimpleChatWidget.java:203)
	at eu.webtoolkit.jwt.examples.simplechat.SimpleChatWidget$6.trigger(SimpleChatWidget.java:1)
	at eu.webtoolkit.jwt.Signal1.trigger(Signal1.java:86)
	at eu.webtoolkit.jwt.EventSignal1.processDynamic(EventSignal1.java:82)
	at eu.webtoolkit.jwt.WebSession.processSignal(WebSession.java:1522)
	at eu.webtoolkit.jwt.WebSession.notifySignal(WebSession.java:1616)
	at eu.webtoolkit.jwt.WebSession.notify(WebSession.java:381)
	at eu.webtoolkit.jwt.WApplication.notify(WApplication.java:2264)
	at eu.webtoolkit.jwt.WebSession.handleRequest(WebSession.java:1288)
	at eu.webtoolkit.jwt.WtServlet.doHandleRequest(WtServlet.java:277)
	at eu.webtoolkit.jwt.ServletApi.handleRequest(ServletApi.java:24)
	at eu.webtoolkit.jwt.ServletApi25.doHandleRequest(ServletApi25.java:27)
	at eu.webtoolkit.jwt.WtServlet.handleRequest(WtServlet.java:189)
	at eu.webtoolkit.jwt.WtServlet.doPost(WtServlet.java:206)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
	at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511)
	at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:401)
	at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
	at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)
	at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:766)
	at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:450)
	at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
	at org.mortbay.jetty.Server.handle(Server.java:326)
	at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)
	at org.mortbay.jetty.HttpConnection$RequestHandler.content(HttpConnection.java:945)
	at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:756)
	at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:218)
	at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
	at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:410)
	at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:582)
Session exiting:9q0h4uhxt8xc1abwfau2tx8jk