[WICKET-4433] Exception (Header was already written to response!) when setting response page in IRequestCycleListener

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Won't Fix
• Affects Version/s: 1.5.4
• Assignee: Unassigned
• Reporter: Neil Curzon
• Created: 27/Feb/12 15:59
• Updated: 14/Mar/17 12:30
• Resolved: 14/Mar/17 12:30

Description

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)