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https://issues.apache.org/jira/browse/WICKET-6639?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Martin Grigorov updated WICKET-6639:
------------------------------------
Fix Version/s: 7.14.0
> PageStoreManager$SessionEntry.clear produces NullPointerException
> -----------------------------------------------------------------
>
> Key: WICKET-6639
> URL: https://issues.apache.org/jira/browse/WICKET-6639
> Project: Wicket
> Issue Type: Bug
> Components: wicket
> Affects Versions: 8.3.0
> Reporter: Mikhail Fursov
> Assignee: Martin Grigorov
> Priority: Major
> Fix For: 9.0.0-M1, 8.4.0, 7.14.0
>
> Original Estimate: 1h
> Remaining Estimate: 1h
>
> Sometimes when I return to my website after some period I see the following
> exception:
> {noformat}
> java.lang.NullPointerException
> at
> org.apache.wicket.page.PageStoreManager$SessionEntry.clear(PageStoreManager.java:365)
> at
> org.apache.wicket.page.PageStoreManager$SessionEntry.valueUnbound(PageStoreManager.java:353)
> at
> org.apache.catalina.session.StandardSession.removeAttributeInternal(StandardSession.java:1784)
> at
> org.apache.catalina.session.StandardSession.expire(StandardSession.java:856)
> at
> org.apache.catalina.session.StandardSession.isValid(StandardSession.java:659)
> at
> org.apache.catalina.session.ManagerBase.processExpires(ManagerBase.java:573)
> at
> org.apache.catalina.session.ManagerBase.backgroundProcess(ManagerBase.java:558)
> at
> org.apache.catalina.core.StandardContext.backgroundProcess(StandardContext.java:5496)
> at
> org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1351)
> at
> org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1355)
> at
> org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1355)
> at
> org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.run(ContainerBase.java:1333){noformat}
>
> This is very hard to investigate what is the reason for this bug from my side
> because I do not have a stable reproducer , but I believe one of the
> following 1-line fixes in Wicket
> # Adding a null check for sessionCache before using it
> # Making sessionCache field never null
> can resolve this problem.
>
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