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https://issues.apache.org/jira/browse/WICKET-6022?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14996337#comment-14996337
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Sven Meier commented on WICKET-6022:
------------------------------------
>But shounldn't Wicket remove / stop all behaviors attached to an old
>component?
Yes, it does stop the timers. But there might already be an event in the
channel queue, which will fire nevertheless. Usually the test on existence of
the component is enough to prevent unwanted Ajax requests.
> ComponentNotFoundException using AbstractAjaxTimerBehavior and different
> AjaxChanels
> ------------------------------------------------------------------------------------
>
> Key: WICKET-6022
> URL: https://issues.apache.org/jira/browse/WICKET-6022
> Project: Wicket
> Issue Type: Bug
> Components: wicket
> Affects Versions: 6.20.0
> Reporter: Paul
> Assignee: Sven Meier
> Priority: Minor
> Attachments: quickstart.zip
>
>
> I've got the following problem:
> I use several Ajax-Channels for my Project. When an AbstractAjaxTimerBehavior
> is attached to a element which is later removed via Ajax, I get a little
> later a RuntimeException, as the Timer is still active, but has no Component
> left attached to the page.
> I attached a Quickstart demonstrating this problem. If you leave the
> AjaxChannel as it is, you won't have the problem, as the timers are stopped
> upon removal of the component the timer is attached to. But if the name of
> the channel differs from the default value, this problem occurs.
> Cheers
> Paul
> {quote}
> Stacktrace:
> Root cause:
> org.apache.wicket.core.request.handler.ComponentNotFoundException: Component
> 'panel:timer' has been removed from page.
> at
> org.apache.wicket.core.request.handler.ListenerInterfaceRequestHandler.respond(ListenerInterfaceRequestHandler.java:178)
> at
> org.apache.wicket.request.cycle.RequestCycle$HandlerExecutor.respond(RequestCycle.java:890)
> at
> org.apache.wicket.request.RequestHandlerStack.execute(RequestHandlerStack.java:64)
> at
> org.apache.wicket.request.cycle.RequestCycle.execute(RequestCycle.java:261)
> at
> org.apache.wicket.request.cycle.RequestCycle.processRequest(RequestCycle.java:218)
> at
> org.apache.wicket.request.cycle.RequestCycle.processRequestAndDetach(RequestCycle.java:289)
> at
> org.apache.wicket.protocol.http.WicketFilter.processRequestCycle(WicketFilter.java:259)
> at
> org.apache.wicket.protocol.http.WicketFilter.processRequest(WicketFilter.java:201)
> at
> org.apache.wicket.protocol.http.WicketFilter.doFilter(WicketFilter.java:282)
> at
> org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1291)
> at
> org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:443)
> at
> org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:137)
> at
> org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:556)
> at
> org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:227)
> at
> org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1044)
> at
> org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:372)
> at
> org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:189)
> at
> org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:978)
> at
> org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:135)
> at
> org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:116)
> at org.eclipse.jetty.server.Server.handle(Server.java:369)
> at
> org.eclipse.jetty.server.AbstractHttpConnection.handleRequest(AbstractHttpConnection.java:486)
> at
> org.eclipse.jetty.server.BlockingHttpConnection.handleRequest(BlockingHttpConnection.java:53)
> at
> org.eclipse.jetty.server.AbstractHttpConnection.headerComplete(AbstractHttpConnection.java:933)
> at
> org.eclipse.jetty.server.AbstractHttpConnection$RequestHandler.headerComplete(AbstractHttpConnection.java:995)
> at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:644)
> at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:235)
> at
> org.eclipse.jetty.server.BlockingHttpConnection.handle(BlockingHttpConnection.java:72)
> at
> org.eclipse.jetty.server.bio.SocketConnector$ConnectorEndPoint.run(SocketConnector.java:264)
> at
> org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:608)
> at
> org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:543)
> at java.lang.Thread.run(Unknown Source)
> {quote}
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