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https://issues.apache.org/jira/browse/WICKET-3876?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13061213#comment-13061213
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Andera Del Bene commented on WICKET-3876:
-----------------------------------------
The line of code which throws the exception (AsynchronousDataStore.java:192) is
relative to snapshot code o is exactly from RC5.1 version?
Anyway, I've implemented a version AsynchronousDataStore which makes extensive
use of java.util.concurrent.ThreadPoolExecutor class to coordinate saving
thread and queue. Using ThreadPoolExecutor you can delegate it
synchronization's issues (it's a Java 5 class).
The code is much more simple and I've successfully tested id with
DiskDataStoreTest. I've called it AsyncDataStore in order to easily switch
between the current AsynchronousDataStore and my new class.
Can you give my class a chance :-)?
> 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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