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https://issues.apache.org/jira/browse/WICKET-4433?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13497171#comment-13497171
]
Jan Riehn commented on WICKET-4433:
-----------------------------------
Hello,
Martins solution does not really fix the problem. The first request is
scheduled and executed, might be that the RestartResponseException should avoid
this.
The following snippet fits better:
public class MyRequestCycleListener extends AbstractRequestCycleListener {
@Override
public void onRequestHandlerResolved(RequestCycle cycle, IRequestHandler
handler) {
if (handler instanceof IPageRequestHandler) {
if (condition) {
throw new RedirectToUrlException("http://wicket.apache.org/";);
}
}
}
}
Best regards,
Jan
> Exception (Header was already written to response!) when setting response
> page in IRequestCycleListener
> -------------------------------------------------------------------------------------------------------
>
> Key: WICKET-4433
> URL: https://issues.apache.org/jira/browse/WICKET-4433
> Project: Wicket
> Issue Type: Bug
> Affects Versions: 1.5.4
> Reporter: Neil Curzon
> Attachments: myproject.zip, myproject.zip
>
>
> We have an IRequestCycleListener implementation that's basically:
> @Override
> public void onBeginRequest(RequestCycle cycle) {
> if (<condition>)) {
> cycle.setResponsePage(SpecificPage.class);
> }
> }
> This results in an exception when the condition is true, and the response
> page is set:
> java.lang.IllegalStateException: Header was already written to response!
> at
> org.apache.wicket.protocol.http.HeaderBufferingWebResponse.checkHeader(HeaderBufferingWebResponse.java:64)
> at
> org.apache.wicket.protocol.http.HeaderBufferingWebResponse.setDateHeader(HeaderBufferingWebResponse.java:134)
> at
> org.apache.wicket.protocol.http.BufferedWebResponse$SetDateHeaderAction.invoke(BufferedWebResponse.java:310)
> at
> org.apache.wicket.protocol.http.BufferedWebResponse.writeTo(BufferedWebResponse.java:580)
> at
> org.apache.wicket.request.handler.render.WebPageRenderer.respond(WebPageRenderer.java:185)
> at
> org.apache.wicket.request.handler.RenderPageRequestHandler.respond(RenderPageRequestHandler.java:167)
> at
> org.apache.wicket.request.cycle.RequestCycle$HandlerExecutor.respond(RequestCycle.java:781)
> at
> org.apache.wicket.request.RequestHandlerStack.execute(RequestHandlerStack.java:64)
> at
> org.apache.wicket.request.cycle.RequestCycle.executeExceptionRequestHandler(RequestCycle.java:304)
> at
> org.apache.wicket.request.cycle.RequestCycle.executeExceptionRequestHandler(RequestCycle.java:313)
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