Hi , I am trying Wicketstuff-push with a small chat program , but encounter this problem :
org.apache.wicket.WicketRuntimeException: Method onFormSubmitted of interface org.apache.wicket.markup.html.form.IFormSubmitListener targeted at component [MarkupContainer [Component id = sayForm]] threw an exception at org.apache.wicket.RequestListenerInterface.invoke(RequestListenerInterface.java:193) at org.apache.wicket.request.target.component.listener.ListenerInterfaceRequestTarget.processEvents(ListenerInterfaceRequestTarget.java:73) at org.apache.wicket.request.AbstractRequestCycleProcessor.processEvents(AbstractRequestCycleProcessor.java:92) at org.apache.wicket.RequestCycle.processEventsAndRespond(RequestCycle.java:1250) at org.apache.wicket.RequestCycle.step(RequestCycle.java:1329) at org.apache.wicket.RequestCycle.steps(RequestCycle.java:1428) at org.apache.wicket.RequestCycle.request(RequestCycle.java:545) at org.apache.wicket.protocol.http.WicketFilter.doGet(WicketFilter.java:479) at org.apache.wicket.protocol.http.WicketServlet.doPost(WicketServlet.java:160) at javax.servlet.http.HttpServlet.service(HttpServlet.java:158) at javax.servlet.http.HttpServlet.service(HttpServlet.java:96) at com.caucho.server.dispatch.ServletFilterChain.doFilter(ServletFilterChain.java:109) at destiny.webapp.filters.FilterUserAgent.doFilter(FilterUserAgent.java:29) at com.caucho.server.dispatch.FilterFilterChain.doFilter(FilterFilterChain.java:88) at org.springframework.orm.jpa.support.OpenEntityManagerInViewFilter.doFilterInternal(OpenEntityManagerInViewFilter.java:113) at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76) at com.caucho.server.dispatch.FilterFilterChain.doFilter(FilterFilterChain.java:88) at org.springframework.orm.jpa.support.OpenEntityManagerInViewFilter.doFilterInternal(OpenEntityManagerInViewFilter.java:113) at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76) at com.caucho.server.dispatch.FilterFilterChain.doFilter(FilterFilterChain.java:88) at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:83) at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76) at com.caucho.server.dispatch.FilterFilterChain.doFilter(FilterFilterChain.java:88) at com.caucho.server.webapp.WebAppFilterChain.doFilter(WebAppFilterChain.java:183) at com.caucho.server.webapp.AccessLogFilterChain.doFilter(AccessLogFilterChain.java:103) at com.caucho.server.dispatch.ServletInvocation.service(ServletInvocation.java:286) at com.caucho.server.http.HttpRequest.handleRequest(HttpRequest.java:789) at com.caucho.network.listen.TcpSocketLink.dispatchRequest(TcpSocketLink.java:660) at com.caucho.network.listen.TcpSocketLink.handleRequestsImpl(TcpSocketLink.java:624) at com.caucho.network.listen.TcpSocketLink.handleRequests(TcpSocketLink.java:575) at com.caucho.network.listen.TcpSocketLink$AcceptTask.doTask(TcpSocketLink.java:1183) at com.caucho.network.listen.TcpSocketLink$ConnectionReadTask.runThread(TcpSocketLink.java:1118) at com.caucho.network.listen.TcpSocketLink$AcceptTask.run(TcpSocketLink.java:1150) at com.caucho.util.ThreadPool$PoolThread.runTasks(ThreadPool.java:901) at com.caucho.util.ThreadPool$PoolThread.run(ThreadPool.java:866) Caused by: java.lang.reflect.InvocationTargetException at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at org.apache.wicket.RequestListenerInterface.invoke(RequestListenerInterface.java:182) ... 34 more Caused by: java.lang.NullPointerException at org.wicketstuff.push.cometd.CometdService.initBayeux(CometdService.java:184) at org.wicketstuff.push.cometd.CometdService.getBayeux(CometdService.java:161) at org.wicketstuff.push.cometd.CometdService.publish(CometdService.java:155) at destiny.wicket.chatroom.ChatPanel$SayForm.onSubmit(ChatPanel.java:603) at org.apache.wicket.markup.html.form.Form.delegateSubmit(Form.java:1538) at org.apache.wicket.markup.html.form.Form.process(Form.java:934) at org.apache.wicket.markup.html.form.Form.onFormSubmitted(Form.java:896) ... 39 more After tracing some code , it seems _bayeux cannot be initialized in CometdService.initBayeux() , and that's because it cannot find an attribute "org.cometd.bayeux" in ServletContext. But I didn't find any code that setAttribute("org.cometd.bayeux" , something) in ContinuationCometdServlet Did I miss anything ? Here is my configurations : web.xml : <servlet> <servlet-name>cometd</servlet-name> <servlet-class>org.mortbay.cometd.continuation.ContinuationCometdServlet</servlet-class> <init-param> <param-name>timeout</param-name> <param-value>60000</param-value> </init-param> </servlet> <servlet-mapping> <servlet-name>cometd</servlet-name> <url-pattern>/cometd/*</url-pattern> </servlet-mapping> lib/ : wicket-1.4.9.jar push-1.4.7.jar cometd-api-1.1.1.jar cometd-server-6.1.22.jar servlet-container : resin 4.0.7