[jira] [Updated] (WICKET-3876) Improve synchronization in AsynchronousDataStore buffer structure

["Andera Del Bene (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/WICKET-3876?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Andera Del Bene updated WICKET-3876:
------------------------------------

    Attachment: AsyncDataStore.java

> 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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