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https://issues.apache.org/jira/browse/WICKET-3876?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13061266#comment-13061266
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Martin Grigorov commented on WICKET-3876:
-----------------------------------------
The code looks OK.
I'll try it locally and if it is stable then I'll use it in our performance
tests.
> Improve synchronization in AsynchronousDataStore buffer structure
> -----------------------------------------------------------------
>
> Key: WICKET-3876
> URL: https://issues.apache.org/jira/browse/WICKET-3876
> Project: Wicket
> Issue Type: Bug
> Components: wicket-core
> Affects Versions: 1.5-RC5.1
> Reporter: Martin Grigorov
> Attachments: AsyncDataStore.java
>
>
> On heavy load we saw the following exception in the logs:
> java.lang.NullPointerException
>
> org.apache.wicket.pageStore.AsynchronousDataStore.removeData(AsynchronousDataStore.java:192)
>
> org.apache.wicket.pageStore.DefaultPageStore.removePageData(DefaultPageStore.java:104)
>
> org.apache.wicket.pageStore.DefaultPageStore.unbind(DefaultPageStore.java:149)
>
> org.apache.wicket.page.PageStoreManager.sessionExpired(PageStoreManager.java:407)
> org.apache.wicket.Application.sessionUnbound(Application.java:474)
>
> org.apache.wicket.protocol.http.WebApplication.sessionUnbound(WebApplication.java:456)
>
> org.apache.wicket.session.HttpSessionStore$SessionBindingListener.valueUnbound(HttpSessionStore.java:415)
>
> org.apache.catalina.session.StandardSession.removeAttributeInternal(StandardSession.java:1788)
>
> org.apache.catalina.session.StandardSession.expire(StandardSession.java:866)
>
> org.apache.catalina.session.StandardSession.expire(StandardSession.java:740)
>
> org.apache.catalina.session.StandardSession.invalidate(StandardSession.java:1253)
>
> org.apache.catalina.session.StandardSessionFacade.invalidate(StandardSessionFacade.java:186)
>
> org.apache.wicket.session.HttpSessionStore.invalidate(HttpSessionStore.java:177)
> org.apache.wicket.Session.destroy(Session.java:492)
> org.apache.wicket.Session.invalidateNow(Session.java:504)
> org.apache.wicket.Session.detach(Session.java:645)
>
> org.apache.wicket.request.cycle.RequestCycle.onDetach(RequestCycle.java:543)
>
> org.apache.wicket.request.cycle.RequestCycle.detach(RequestCycle.java:477)
>
> org.apache.wicket.request.cycle.RequestCycle.processRequestAndDetach(RequestCycle.java:255)
>
> org.apache.wicket.protocol.http.WicketFilter.processRequest(WicketFilter.java:160)
>
> org.apache.wicket.protocol.http.WicketFilter.doFilter(WicketFilter.java:216)
> ....
> The buffer structure "entries" may be emptied by one worker thread and tried
> to be emptied in another...
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