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https://issues.apache.org/jira/browse/WICKET-6022?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14996281#comment-14996281
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Paul commented on WICKET-6022:
------------------------------
{quote}
You're replacing TimerPanel with EmptyPanel, the latter not having a behavior
added. This is a corner case where wicket-ajax sess the component still in the
component tree, thus firing the Ajax request, but the behavior is not there on
EmptyPanel.
You should avoid replacing components that have a timer added directly to them.
{quote}
But shounldn't Wicket remove / stop all behaviors attached to an old component?
If I add another behavior to the EmptyPanel it would be a mistake, if this
behavior is fired, just because an behavior attached to an already replaced
component is sheduled to be fired. Or am I mistaken?
> 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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