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
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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