The behavior might actually by a button's ajax submit.
The npe occurs finally at the setModelObject:
2008-11-04 17:29:24,730 30836229 [btpool0-40] ERROR RequestCycle -
java.lang.NullPointerException
at com.xx.view.EditorPanel$ListOfStuff$1.setObject(EditorPanel.java:481)
**
Martin
2008/11/4 Igor Vaynberg <[EMAIL PROTECTED]>:
> the error means that a behavior constructed the url, but when the user
> followed the url the behavior could no longer be found.
>
> what npe? can you show the full stack trace?
>
> -igor
>
> On Tue, Nov 4, 2008 at 10:01 AM, Martin Makundi
> <[EMAIL PROTECTED]> wrote:
>> What is a temporary behavior?
>>
>> I do not understand conceptually how a behavior can be invoked if it
>> is no longer there..
>>
>> The error log shows a nearby nullpointer exception which might have
>> occurred during the same OnAjaxChangeBehavior .. maybe it led into an
>> illegal state:
>>
>> at org.apache.wicket.Component.setModelObject(Component.java:2951)
>> at
>> org.apache.wicket.markup.html.form.FormComponent.updateModel(FormComponent.java:1082)
>> at org.apache.wicket.markup.html.form.Form$19.validate(Form.java:1810)
>> at
>> org.apache.wicket.markup.html.form.Form$ValidationVisitor.formComponent(Form.java:162)
>> at
>> org.apache.wicket.markup.html.form.FormComponent.visitFormComponentsPostOrderHelper(FormComponent.java:426)
>> at
>> org.apache.wicket.markup.html.form.FormComponent.visitFormComponentsPostOrderHelper(FormComponent.java:413)
>> at
>> org.apache.wicket.markup.html.form.FormComponent.visitFormComponentsPostOrderHelper(FormComponent.java:413)
>> at
>> org.apache.wicket.markup.html.form.FormComponent.visitFormComponentsPostOrderHelper(FormComponent.java:413)
>> at
>> org.apache.wicket.markup.html.form.FormComponent.visitFormComponentsPostOrderHelper(FormComponent.java:413)
>> at
>> org.apache.wicket.markup.html.form.FormComponent.visitFormComponentsPostOrderHelper(FormComponent.java:413)
>> at
>> org.apache.wicket.markup.html.form.FormComponent.visitFormComponentsPostOrderHelper(FormComponent.java:413)
>> at
>> org.apache.wicket.markup.html.form.FormComponent.visitFormComponentsPostOrderHelper(FormComponent.java:413)
>> at
>> org.apache.wicket.markup.html.form.FormComponent.visitFormComponentsPostOrder(FormComponent.java:390)
>> at
>> org.apache.wicket.markup.html.form.Form.visitFormComponentsPostOrder(Form.java:1049)
>> at
>> org.apache.wicket.markup.html.form.Form.internalUpdateFormComponentModels(Form.java:1801)
>> at
>> org.apache.wicket.markup.html.form.Form.updateFormComponentModels(Form.java:1769)
>> at org.apache.wicket.markup.html.form.Form.process(Form.java:851)
>> at
>> org.apache.wicket.markup.html.form.Form.onFormSubmitted(Form.java:793)
>> at
>> org.apache.wicket.ajax.form.AjaxFormSubmitBehavior.onEvent(AjaxFormSubmitBehavior.java:132)
>> at
>> org.apache.wicket.ajax.AjaxEventBehavior.respond(AjaxEventBehavior.java:161)
>> at
>> org.apache.wicket.ajax.AbstractDefaultAjaxBehavior.onRequest(AbstractDefaultAjaxBehavior.java:298)
>> at
>> org.apache.wicket.request.target.component.listener.BehaviorRequestTarget.processEvents(BehaviorRequestTarget.java:100)
>> at
>> org.apache.wicket.request.AbstractRequestCycleProcessor.processEvents(AbstractRequestCycleProcessor.java:91)
>>
>>
>>
>> 2008/11/4 Igor Vaynberg <[EMAIL PROTECTED]>:
>>> looks like the behavior that generated the callbakc url being invoked
>>> is no longer there...
>>>
>>> do you have any temporary behaviors on that component?
>>>
>>> -igor
>>>
>>> On Tue, Nov 4, 2008 at 9:07 AM, Martin Makundi
>>> <[EMAIL PROTECTED]> wrote:
>>>> Hi!
>>>>
>>>> What does this error mean?
>>>>
>>>> No behavior listener found with behaviorId 0
>>>>
>>>> What is being done wrong? Normally, the site works ok but the error
>>>> log shows this kind of error.
>>>>
>>>> Am I manifesting some known Wicket antipattern which causes this
>>>> error? Or is it just a result of another illegal state?
>>>>
>>>> at
>>>> org.apache.wicket.request.target.component.listener.BehaviorRequestTarget.processEvents(BehaviorRequestTarget.java:95)
>>>> at
>>>> org.apache.wicket.request.AbstractRequestCycleProcessor.processEvents(AbstractRequestCycleProcessor.java:91)
>>>> at
>>>> org.apache.wicket.RequestCycle.processEventsAndRespond(RequestCycle.java:1174)
>>>> at org.apache.wicket.RequestCycle.step(RequestCycle.java:1251)
>>>> at org.apache.wicket.RequestCycle.steps(RequestCycle.java:1352)
>>>> at org.apache.wicket.RequestCycle.request(RequestCycle.java:499)
>>>> at
>>>> org.apache.wicket.protocol.http.WicketFilter.doGet(WicketFilter.java:375)
>>>> at
>>>> org.apache.wicket.protocol.http.WicketServlet.doPost(WicketServlet.java:145)
>>>> at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
>>>> at wicket.quickstart.TakpServlet.service(TakpServlet.java:58)
>>>> at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
>>>> at
>>>> org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:491)
>>>> at
>>>> org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:367)
>>>> at
>>>> org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:185)
>>>> at
>>>> org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:181)
>>>> at
>>>> org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:689)
>>>> at
>>>> org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:391)
>>>> at
>>>> org.mortbay.jetty.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:146)
>>>> at
>>>> org.mortbay.jetty.handler.HandlerCollection.handle(HandlerCollection.java:114)
>>>> at
>>>> org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:139)
>>>> at org.mortbay.jetty.Server.handle(Server.java:285)
>>>> at
>>>> org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:457)
>>>> at
>>>> org.mortbay.jetty.HttpConnection$RequestHandler.content(HttpConnection.java:765)
>>>> at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:627)
>>>> at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:203)
>>>> at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:357)
>>>> at
>>>> org.mortbay.jetty.bio.SocketConnector$Connection.run(SocketConnector.java:217)
>>>> at
>>>> org.mortbay.thread.BoundedThreadPool$PoolThread.run(BoundedThreadPool.java:475)
>>>>
>>>>
>>>> **
>>>> Martin
>>>>
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>>>>
>>>>
>>>
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>>>
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