That is pretty much it. Except that:
Caused by: java.lang.NullPointerException
at
com.namechangedtoprotectguilty.search.Criterion.getHelper(Criterion.java:200)
at sun.reflect.GeneratedMethodAccessor41.invoke(Unknown Source)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at
org.apache.wicket.util.lang.PropertyResolver$MethodGetAndSet.getValue(PropertyResolver.java:1030)
Blows up in our code in a way that really looks like a multithreading issue
to me. If I click slowly no problems, if I click quickly on a slow page it
reliably blows up. Guess I could put in a sync filter to double check that
it is a sync error. We don't create any threads so apart from threading
issue I can't see what else it could be...
igor.vaynberg wrote:
>
> show us the full stack trace
>
> -igor
>
> On 9/18/07, Sam Hough <[EMAIL PROTECTED]> wrote:
>>
>>
>> Which bit of code does the blocking on the server? I'm getting what looks
>> very much like a threading issue. I've looked at all the methods below
>> and
>> can't see any obvious sync code... I'm using 1.3-beta3
>>
>> at
>> org.apache.wicket.util.lang.PropertyResolver$MethodGetAndSet.getValue(
>> PropertyResolver.java:1034)
>> at
>> org.apache.wicket.util.lang.PropertyResolver.getObjectAndGetSetter(
>> PropertyResolver.java:247)
>> at
>> org.apache.wicket.util.lang.PropertyResolver.getValue(
>> PropertyResolver.java:89)
>> at
>> org.apache.wicket.model.AbstractPropertyModel.getObject(
>> AbstractPropertyModel.java:110)
>> at
>> org.apache.wicket.Component.getModelObject(Component.java:1293)
>> at org.apache.wicket.Component$2.compare(Component.java:540)
>> at
>> org.apache.wicket.Component.setModelObject(Component.java:2522)
>> at
>> org.apache.wicket.markup.html.form.FormComponent.updateModel(
>> FormComponent.java:1002)
>> at org.apache.wicket.markup.html.form.Form$14.validate(Form.java
>> :1642)
>> at
>> org.apache.wicket.markup.html.form.Form$ValidationVisitor.formComponent(
>> Form.java:160)
>> at
>>
>> org.apache.wicket.markup.html.form.FormComponent.visitFormComponentsPostOrderHelper
>> (FormComponent.java:403)
>> at
>>
>> org.apache.wicket.markup.html.form.FormComponent.visitFormComponentsPostOrderHelper
>> (FormComponent.java:390)
>> at
>>
>> org.apache.wicket.markup.html.form.FormComponent.visitFormComponentsPostOrderHelper
>> (FormComponent.java:390)
>> at
>>
>> org.apache.wicket.markup.html.form.FormComponent.visitFormComponentsPostOrderHelper
>> (FormComponent.java:390)
>> at
>>
>> org.apache.wicket.markup.html.form.FormComponent.visitFormComponentsPostOrderHelper
>> (FormComponent.java:390)
>> at
>>
>> org.apache.wicket.markup.html.form.FormComponent.visitFormComponentsPostOrder
>> (FormComponent.java:368)
>> at
>> org.apache.wicket.markup.html.form.Form.visitFormComponentsPostOrder(
>> Form.java:1004)
>> at
>> org.apache.wicket.markup.html.form.Form.updateFormComponentModels(
>> Form.java:1637)
>> at org.apache.wicket.markup.html.form.Form.process(Form.java:834)
>> at org.apache.wicket.markup.html.form.Form.onFormSubmitted(
>> Form.java:783)
>> at
>> org.apache.wicket.ajax.form.AjaxFormSubmitBehavior.onEvent(
>> AjaxFormSubmitBehavior.java:126)
>> at
>> org.apache.wicket.ajax.AjaxEventBehavior.respond(AjaxEventBehavior.java
>> :163)
>> at
>> org.apache.wicket.ajax.AbstractDefaultAjaxBehavior.onRequest(
>> AbstractDefaultAjaxBehavior.java:268)
>> at
>>
>> org.apache.wicket.request.target.component.listener.BehaviorRequestTarget.processEvents
>> (BehaviorRequestTarget.java:100)
>> at
>> org.apache.wicket.request.AbstractRequestCycleProcessor.processEvents(
>> AbstractRequestCycleProcessor.java:90)
>> at
>> org.apache.wicket.RequestCycle.processEventsAndRespond(RequestCycle.java
>> :1032)
>> at org.apache.wicket.RequestCycle.step(RequestCycle.java:1108)
>> at org.apache.wicket.RequestCycle.steps(RequestCycle.java:1177)
>> at org.apache.wicket.RequestCycle.request(RequestCycle.java:500)
>> at
>> org.apache.wicket.protocol.http.WicketFilter.doGet(WicketFilter.java:261)
>> at
>> org.apache.wicket.protocol.http.WicketFilter.doFilter(WicketFilter.java
>> :127)
>> at
>> org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(
>> ApplicationFilterChain.java:215)
>> at
>> org.apache.catalina.core.ApplicationFilterChain.doFilter(
>> ApplicationFilterChain.java:188)
>> at
>> org.apache.catalina.core.StandardWrapperValve.invoke(
>> StandardWrapperValve.java:210)
>> at
>> org.apache.catalina.core.StandardContextValve.invoke(
>> StandardContextValve.java:174)
>> at
>> org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java
>> :127)
>> at
>> org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java
>> :117)
>> at
>> org.apache.catalina.core.StandardEngineValve.invoke(
>> StandardEngineValve.java:108)
>> at
>> org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java
>> :151)
>> at
>> org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:870)
>> at
>>
>> org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection
>> (Http11BaseProtocol.java:665)
>> at
>> org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(
>> PoolTcpEndpoint.java:528)
>> at
>> org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(
>> LeaderFollowerWorkerThread.java:81)
>> at
>> org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(
>> ThreadPool.java:685)
>> at java.lang.Thread.run(Thread.java:595)
>>
>>
>> Matej Knopp-2 wrote:
>> >
>> > There is no way that ajax requests can be processed without blocking.
>> > a) ajax requests are ordered on client into queues
>> > b) requests are blocked on target page (not session) on server side
>> >
>> > -Matej
>> >
>> > On 9/7/07, Sam Hough <[EMAIL PROTECTED]> wrote:
>> >>
>> >> A bit of the application lets you add items to a list using
>> >> AjaxFallbackButton. All works fine if you click the buttons slowly but
>> if
>> >> I
>> >> click quickly I get exceptions that look like my code is running
>> >> concurrently (nullpointer where it can't happen if running in a single
>> >> thread).
>> >>
>> >> What behaviour is Wicket aiming to implement for Ajax and threading?
>> >>
>> >>
>> >>
>> >> Matej Knopp-2 wrote:
>> >> >
>> >> > Can you be more specific? What kind of concurrency issues?
>> >> >
>> >> > -Matej
>> >> >
>> >> > On 9/7/07, Sam Hough <[EMAIL PROTECTED]> wrote:
>> >> >>
>> >> >> oops, I posted on old forum...
>> >> >>
>> >> >> http://www.nabble.com/threading-question-tf841003.html
>> >> >>
>> >> >> [all request serialised on Session object]
>> >> >>
>> >> >> Is this true even for Ajax requests? Is whole life cycle
>> effectively
>> >> >> single
>> >> >> threaded for a single session?
>> >> >>
>> >> >> I think I'm seeing a concurrency issue in my website (Wicket
>> 1.3-beta3
>> >> >> and
>> >> >> lots of AjaxFallbackButton, I did listen to Igor)...
>> >> >>
>> >> >> Obviously would be tempting to sync on the Session but might break
>> lot
>> >> of
>> >> >> the usability advantages of Ajax...
>> >> >>
>> >> >> Anybody got any top tips?
>> >> >> --
>> >> >> View this message in context:
>> >> >>
>> >>
>> http://www.nabble.com/threading-issues---continued-tf4400569.html#a12552735
>> >> >> Sent from the Wicket - User mailing list archive at Nabble.com.
>> >> >>
>> >> >>
>> >> >>
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>> >> >>
>> >> >>
>> >> >
>> >> >
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>> >> >
>> >> >
>> >> >
>> >>
>> >> --
>> >> View this message in context:
>> >>
>> http://www.nabble.com/threading-issues---continued-tf4400569.html#a12553207
>> >> Sent from the Wicket - User mailing list archive at Nabble.com.
>> >>
>> >>
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>> >> For additional commands, e-mail: [EMAIL PROTECTED]
>> >>
>> >>
>> >
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>> >
>> >
>> >
>>
>> --
>> View this message in context:
>> http://www.nabble.com/threading-issues---continued-tf4400569.html#a12759130
>> Sent from the Wicket - User mailing list archive at Nabble.com.
>>
>>
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>>
>
>
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