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https://issues.apache.org/jira/browse/WICKET-4374?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13197003#comment-13197003
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Arne Baganz commented on WICKET-4374:
-------------------------------------

Looking at the stacktrace, this does not seem to be a Wicket issue anymore, 
because 
"org.eclipse.jetty.server.session.AbstractSession.unbindValue(AbstractSession.java:486)"
 unbinds the session (I´m using jetty-distribution-8.0.4.v20111024 in 
conjunction with jetty-nosql-memcached-kryo-0.2.0-SNAPSHOT).
                
> IDataStore#removeData(String sessionId) is called when the session should not 
> have expired
> ------------------------------------------------------------------------------------------
>
>                 Key: WICKET-4374
>                 URL: https://issues.apache.org/jira/browse/WICKET-4374
>             Project: Wicket
>          Issue Type: Bug
>          Components: wicket
>    Affects Versions: 1.5.4
>         Environment: Debian 6.0.2
>            Reporter: Arne Baganz
>              Labels: IDataStore, wicket
>         Attachments: clustered-stack.log
>
>
> I´m running Wicket in a clustered setup (1 loadbalancer with non-sticky 
> sessions, 2 servers running the webapp, the sessions are stored in memcache). 
> I´m using a custom IDataStore relying on EhCache and I´m wondering about 
> IDataStore#removeData(String sessionId) being called quite often (wicket 
> seems to assume the session to be expired), even image resources call that 
> method. But the session should not be expired (at least I think it should not 
> have), because after IDataStore#removeData(String sessionId) has been called, 
> the webapp still tries to access pages from that very same session via 
> IDataStore#getData(String sessionId, int id) and tries to store pages via 
> IDataStore#storeData(String sessionId, int id, byte[] data). So in order to 
> keep my webapp working, I do not do anything in my implementation of 
> IDataStore#removeData(String sessionId) anymore, because it would break 
> AJAX-requests (the page could not be found in the store, because it had been 
> wiped via IDataStore#removeData(String sessionId) and the URL gets rewritten 
> with a fallback containing the notorious page id version after the quesion 
> mark, i.e. http://www.mypage.com/myfolder/myfile-11.html?0, which is not a 
> fitting response to the AJAX-request).
> Unfortunately, I do not see an easy way to provide a quickstart, which 
> reproduces the problem. Even if I could provide a quickstart, it would maybe 
> be heavily dependent on my setup as described above.

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