[jira] [Created] (WICKET-6639) PageStoreManager$SessionEntry.clear produces NullPointerException

["Mikhail Fursov (JIRA)" <ji...@apache.org>]

Mikhail Fursov created WICKET-6639:
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             Summary: 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


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 know a stable reproducer , but I believe one of the following 1-line fixes in Wicket
 # Adding a null check for sessionCache before calling it
 # Making sessionCache never null

can resolve this problem.

 



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