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https://issues.apache.org/jira/browse/WICKET-333?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Alastair Maw resolved WICKET-333.
---------------------------------
Resolution: Won't Fix
The only way this could happen in 1.3 is if the versionManager for the page is
null. I can't see how that could happen, so I'm marking this one wontfix
against 2.0.
> NPE in wicket.Page.componentStateChanging
> -----------------------------------------
>
> Key: WICKET-333
> URL: https://issues.apache.org/jira/browse/WICKET-333
> Project: Wicket
> Issue Type: Bug
> Components: wicket
> Affects Versions: 2.0 branch (discontinued)
> Reporter: John Patterson
>
> I am using an AJAX link to update a ListView which is contained in a
> WebMarkup container. I get this exception:
> wicket.WicketRuntimeException: Error attaching this container for rendering:
> [MarkupContainer [Component id = dimensions, page =
> com.citikey.group.browser.BrowserPage, path =
> 1:dimensions.WebMarkupContainer, isVisible = true, isVersioned = true]]
> at wicket.MarkupContainer.attachChildren(MarkupContainer.java:383)
> at wicket.Component.attach(Component.java:2781)
> at
> wicket.ajax.AjaxRequestTarget.respondComponents(AjaxRequestTarget.java:439)
> at wicket.ajax.AjaxRequestTarget.respond(AjaxRequestTarget.java:330)
> at
> wicket.request.AbstractRequestCycleProcessor.respond(AbstractRequestCycleProcessor.java:114)
> at wicket.RequestCycle.processEventsAndRespond(RequestCycle.java:959)
> at wicket.RequestCycle.step(RequestCycle.java:1026)
> at wicket.RequestCycle.steps(RequestCycle.java:1097)
> at wicket.RequestCycle.request(RequestCycle.java:470)
> at wicket.protocol.http.WicketFilter.doGet(WicketFilter.java:243)
> at wicket.protocol.http.WicketFilter.doFilter(WicketFilter.java:122)
> at
> org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1065)
> at
> org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:365)
> at
> org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:185)
> at
> org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:181)
> at
> org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:689)
> at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:391)
> at
> org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:139)
> at org.mortbay.jetty.Server.handle(Server.java:285)
> at
> org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:457)
> at
> org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:751)
> at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:500)
> at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:209)
> at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:357)
> at
> org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:329)
> at
> org.mortbay.thread.BoundedThreadPool$PoolThread.run(BoundedThreadPool.java:475)
> Caused by: java.lang.NullPointerException
> at wicket.Page.componentStateChanging(Page.java:327)
> at wicket.Component.addStateChange(Component.java:2553)
> at wicket.MarkupContainer.removeAll(MarkupContainer.java:510)
> at wicket.markup.html.list.ListView.onGenerateItems(ListView.java:597)
> at wicket.markup.html.list.ListView.onAttach(ListView.java:550)
> at wicket.Component.attach(Component.java:2770)
> at wicket.MarkupContainer.attachChildren(MarkupContainer.java:372)
> ... 25 more
> The version manager was null which caused this problem.
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