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https://issues.apache.org/jira/browse/WICKET-942?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12527097
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Matej Knopp commented on WICKET-942:
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Can you plese give it a try now? Hopefully the second attempt will work :)
> PageMap.remove(Page) throws ClassCastException
> ----------------------------------------------
>
> Key: WICKET-942
> URL: https://issues.apache.org/jira/browse/WICKET-942
> Project: Wicket
> Issue Type: Bug
> Components: wicket
> Affects Versions: 1.3.0-beta3
> Reporter: John Ray
> Assignee: Matej Knopp
>
> When I try to expire a page by calling PageMap.remove(Page) I get the
> following exception
> java.lang.ClassCastException: java.lang.Integer cannot be cast to
> org.apache.wicket.protocol.http.pagestore.PageWindowManager$PageWindowInternal
> at
> org.apache.wicket.protocol.http.pagestore.PageWindowManager.removePage(PageWindowManager.java:544)
> at
> org.apache.wicket.protocol.http.pagestore.DiskPageStore$SessionEntry.removePage(DiskPageStore.java:255)
> at
> org.apache.wicket.protocol.http.pagestore.DiskPageStore.removePage(DiskPageStore.java:623)
> at
> org.apache.wicket.protocol.http.pagestore.DiskPageStore.removePage(DiskPageStore.java:652)
> at
> org.apache.wicket.protocol.http.SecondLevelCacheSessionStore$SecondLevelCachePageMap.removeEntry(SecondLevelCacheSessionStore.java:368)
> at org.apache.wicket.PageMap.remove(PageMap.java:289)
> The problem in removePage() of the PageWindowManager class was that it wasn't
> getting the PageWindowInternal from the windows list. There is also a problem
> though in that it attempts to iterate through the window indexes and at the
> same time calls removePage() which removes them so you get a
> ConcurrentModificationException. I've tested the following and it works
> public void removePage(int pageId)
> {
> if (idToWindowIndices == null)
> {
> rebuildIndices();
> }
> List indicesList = (List) idToWindowIndices.get(pageId);
> if (indicesList == null)
> {
> return; // Return if page was already removed
> }
> Object[] indices = indicesList.toArray();
> for (int i=0; i < indices.length; i++)
> {
> PageWindowInternal window =
> (PageWindowInternal)windows.get((Integer)indices[i]);
> removePage(window.pageId, window.versionNumber,
> window.ajaxVersionNumber);
> }
> }
> However I ran into another problem. When my page removes itself it then gets
> immediately added back in at the end of the request cycle in
> Session.requestDetached(). So its impossible for a page to expire itself. To
> fix this I would recommend changing the PageMap.remove(Page) method to
> public final void remove(final Page page)
> {
> // Remove the pagemap entry from session
> removeEntry(page.getPageMapEntry());
> // Make sure it doesn't get added again at the end of the
> request cycle
> Session.get().untouch(page);
> }
> and then add the untouch() method to Session
> /**
> * THIS METHOD IS NOT PART OF THE WICKET PUBLIC API. DO NOT CALL IT.
> * <p>
> * This method will remove a page that was previously added via touch()
> * @param page
> */
> public final void untouch(Page page)
> {
> List lst = (List)touchedPages.get();
> if (lst != null)
> {
> lst.remove(page);
> }
> }
> With the above changes my code works as it did under version 1.2.6
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