[jira] [Commented] (WICKET-6966) IndexOutOfBounds in InSessionPageStore

["Sven Meier (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/WICKET-6966?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17514169#comment-17514169 ] 

Sven Meier commented on WICKET-6966:
------------------------------------

That would mean that the container is serializing the session while a web thread is still processing a request, wouldn't it?

What servlet container are you using?

> IndexOutOfBounds in InSessionPageStore
> --------------------------------------
>
>                 Key: WICKET-6966
>                 URL: https://issues.apache.org/jira/browse/WICKET-6966
>             Project: Wicket
>          Issue Type: Bug
>    Affects Versions: 9.8.0
>            Reporter: Youri de Boer
>            Priority: Major
>
> Recently (since wicket 9?) we are seeing the following exception in our log.
> {{ERROR | [default task-43] | 2022-03-28 10:19:03,978 | org.apache.wicket.util.listener.ListenerCollection$1.java:124 | Error invoking listener: org.apache.wicket.Application$2@6e1ac438 "mdw=152293"}}
> {{java.lang.IndexOutOfBoundsException: Index: 0, Size: -1}}
> {{    at java.base/java.util.LinkedList.checkPositionIndex(LinkedList.java:564)}}
> {{    at java.base/java.util.LinkedList.listIterator(LinkedList.java:871)}}
> {{    at java.base/java.util.AbstractList.listIterator(AbstractList.java:311)}}
> {{    at java.base/java.util.AbstractSequentialList.iterator(AbstractSequentialList.java:238)}}
> {{    at org.apache.wicket.pageStore.InSessionPageStore$SessionData.remove(InSessionPageStore.java:226)}}
> {{    at org.apache.wicket.pageStore.InSessionPageStore$SessionData.add(InSessionPageStore.java:212)}}
> {{    at org.apache.wicket.pageStore.InSessionPageStore$CountLimitedData.add(InSessionPageStore.java:320)}}
> {{    at org.apache.wicket.pageStore.InSessionPageStore.addPage(InSessionPageStore.java:127)}}
> {{    at org.apache.wicket.pageStore.CachingPageStore.addPage(CachingPageStore.java:71)}}
> {{    at org.apache.wicket.pageStore.RequestPageStore.detach(RequestPageStore.java:114)}}
> {{    at org.apache.wicket.page.PageManager.detach(PageManager.java:91)}}
> {{    at org.apache.wicket.Application$2.onDetach(Application.java:1582)}}
> {{    at org.apache.wicket.request.cycle.RequestCycleListenerCollection$3.notify(RequestCycleListenerCollection.java:105)}}
> {{    at org.apache.wicket.request.cycle.RequestCycleListenerCollection$3.notify(RequestCycleListenerCollection.java:101)}}
> {{    at org.apache.wicket.util.listener.ListenerCollection$1.notify(ListenerCollection.java:120)}}
> {{    at org.apache.wicket.util.listener.ListenerCollection.reversedNotify(ListenerCollection.java:144)}}
> {{    at org.apache.wicket.util.listener.ListenerCollection.reversedNotifyIgnoringExceptions(ListenerCollection.java:113)}}
> {{    at org.apache.wicket.request.cycle.RequestCycleListenerCollection.onDetach(RequestCycleListenerCollection.java:100)}}
> {{    at org.apache.wicket.request.cycle.RequestCycle.onDetach(RequestCycle.java:670)}}
> {{    at org.apache.wicket.request.cycle.RequestCycle.detach(RequestCycle.java:625)}}
> {{    at org.apache.wicket.protocol.http.WicketFilter.processRequestCycle(WicketFilter.java:285)}}
> {{    at org.apache.wicket.protocol.http.WicketFilter.processRequest(WicketFilter.java:208)}}
> {{    at org.apache.wicket.protocol.http.WicketServlet.doGet(WicketServlet.java:137)}}
> {{    at javax.servlet.api@2.0.0.Final-redhat-00001//javax.servlet.http.HttpServlet.service(HttpServlet.java:503)}}
>  
> When this occurs it typically appears about 100 times in a very short time span. The users experiences a hanging page.
> Obviously, the size of a list can not be -1; I believe this to be a result of a race condition between one of the public methods (which are synchronized) and the writeObject method, which is not synchronized.
>  
> One additional note: we are running 2 wars (with wicket) on the same container.



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