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https://issues.apache.org/jira/browse/WICKET-6465?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16161858#comment-16161858
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ASF GitHub Bot commented on WICKET-6465:
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Github user bitstorm commented on the issue:

    https://github.com/apache/wicket/pull/233
  
    I'm fine with this quick fix, but I warmly suggest to improve it after it 
has been applied, at least in master branch.
    
    About concurrent access afaik we do have to take care of concurrency. At 
the moment we don't have any guarantee that setSessionAttribute saves the entry 
for the last request submitted (for the same session). 


> PageStore not cleared at session end
> ------------------------------------
>
>                 Key: WICKET-6465
>                 URL: https://issues.apache.org/jira/browse/WICKET-6465
>             Project: Wicket
>          Issue Type: Bug
>          Components: wicket
>    Affects Versions: 7.8.0
>         Environment: Tomcat
>            Reporter: Franta Mejta
>            Assignee: Emond Papegaaij
>            Priority: Critical
>         Attachments: WICKET-6465.patch
>
>
> WICKET-6387 causes the page store not to be cleared at logout on Tomcat. The 
> problem is that tomcat does not call {{valueUnbound}} or {{valueBound}} when 
> an attribute is set to the current value (new == old).
> https://github.com/apache/tomcat/blob/e28b35c9e40aeb4b7ac52a98f07ad965630e2766/java/org/apache/catalina/session/StandardSession.java#L1424



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