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https://issues.apache.org/jira/browse/WICKET-2944?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12896365#action_12896365
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Martin Grigorov commented on WICKET-2944:
-----------------------------------------
As the exception message says currently
AjaxRequestTarget$AjaxHeaderResponse.renderJavascriptReference() and few other
methods throw exception if they are not called within
org.apache.wicket.ajax.AjaxRequestTarget.respondHeaderContribution(Response,
Component).
I see two solutions:
# instead of throwing an exception just log a debug message that this call is
no-op for AjaxRequestTarget$AjaxHeaderResponse when called for application
listeners
Pros:
* no such "strange" exceptions during Ajax calls
Cons:
* none
# support these methods to be called for application listeners
Pros:
* no exceptions
Cons:
* there is no need to support them. These methods already have been called for
the page (non-ajax) request and there is no need to make <header-contribution>
for them which will be discarded.
I'm going to implement solution 1 if there are no better ideas.
> Application addRenderHeadListener causing error
> ------------------------------------------------
>
> Key: WICKET-2944
> URL: https://issues.apache.org/jira/browse/WICKET-2944
> Project: Wicket
> Issue Type: Bug
> Components: wicket
> Affects Versions: 1.4.9
> Environment: wicket 1.4.9 jetty 6.1.4
> Reporter: vineet semwal
> Assignee: Martin Grigorov
> Attachments: quickie.jar
>
>
> when i try to use addrenderheaderlistener in application with header
> contributor using methods other than renderonloadjavascript and
> renderOnDomReadyJavascript,i get the exception as ajaxrequesttarget expects
> "Only methods that can be called on IHeaderResponse outside renderHead() are
> renderOnLoadJavascript and renderOnDomReadyJavascript
> attaching a quickstart that shows the behavior where ajaxselfupdatingtimer is
> used.
> exception as follows :-
> Only methods that can be called on IHeaderResponse outside renderHead() are
> renderOnLoadJavascript and renderOnDomReadyJavascript
> org.apache.wicket.WicketRuntimeException: Only methods that can be called on
> IHeaderResponse outside renderHead() are renderOnLoadJavascript and
> renderOnDomReadyJavascript
> at
> org.apache.wicket.ajax.AjaxRequestTarget$AjaxHeaderResponse.checkHeaderRendering(AjaxRequestTarget.java:872)
> at
> org.apache.wicket.ajax.AjaxRequestTarget$AjaxHeaderResponse.renderJavascriptReference(AjaxRequestTarget.java:915)
> at
> com.mycompany.WicketApplication$1.renderHead(WicketApplication.java:28)
> at
> org.apache.wicket.Application.notifyRenderHeadListener(Application.java:1250)
> at
> org.apache.wicket.markup.html.internal.HeaderResponse.<init>(HeaderResponse.java:56)
> at
> org.apache.wicket.ajax.AjaxRequestTarget$AjaxHeaderResponse.<init>(AjaxRequestTarget.java:951)
> at
> org.apache.wicket.ajax.AjaxRequestTarget.getHeaderResponse(AjaxRequestTarget.java:1018)
> at
> org.apache.wicket.ajax.AbstractAjaxTimerBehavior.respond(AbstractAjaxTimerBehavior.java:163)
> at
> org.apache.wicket.ajax.AbstractDefaultAjaxBehavior.onRequest(AbstractDefaultAjaxBehavior.java:286)
> at
> org.apache.wicket.request.target.component.listener.BehaviorRequestTarget.processEvents(BehaviorRequestTarget.java:119)
> at
> org.apache.wicket.request.AbstractRequestCycleProcessor.processEvents(AbstractRequestCycleProcessor.java:92)
> at
> org.apache.wicket.RequestCycle.processEventsAndRespond(RequestCycle.java:1250)
> at org.apache.wicket.RequestCycle.step(RequestCycle.java:1329)
> at org.apache.wicket.RequestCycle.steps(RequestCycle.java:1428)
> at org.apache.wicket.RequestCycle.request(RequestCycle.java:545)
> at
> org.apache.wicket.protocol.http.WicketFilter.doGet(WicketFilter.java:479)
> at
> org.apache.wicket.protocol.http.WicketFilter.doFilter(WicketFilter.java:312)
> at
> org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
> at
> org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:388)
> at
> org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
> at
> org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)
> at
> org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765)
> at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:418)
> at
> org.mortbay.jetty.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:230)
> at
> org.mortbay.jetty.handler.HandlerCollection.handle(HandlerCollection.java:114)
> at
> org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
> at org.mortbay.jetty.Server.handle(Server.java:326)
> at
> org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)
> at
> org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:923)
> at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:547)
> at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:212)
> at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
> at
> org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:409)
> at
> org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:582)
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