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Posted to commits@wicket.apache.org by "Martijn Dashorst (JIRA)" <ji...@apache.org> on 2015/10/13 17:15:05 UTC

[jira] [Created] (WICKET-5998) Page is detached twice in same AJAX request

Martijn Dashorst created WICKET-5998:
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             Summary: Page is detached twice in same AJAX request
                 Key: WICKET-5998
                 URL: https://issues.apache.org/jira/browse/WICKET-5998
             Project: Wicket
          Issue Type: Bug
          Components: wicket
    Affects Versions: 7.0.0
            Reporter: Martijn Dashorst
            Priority: Minor


While debugging some code I noticed that detaching happens twice during the same (AJAX) request.

First through `ListenerInterfaceRequestHandler.detach()` and next through `AjaxRequestHandler.detach(IRequestCycle)`.

The following stack traces show the code paths.

{code}
Thread [qtp1297836716-57] (Suspended (breakpoint at line 858 in MyWebPage))	
	MyWebPage.onDetach() line: 858	
	MyWebPage(Component).detach() line: 1162	
	PageAndComponentProvider(PageProvider).detach() line: 330	
	ListenerInterfaceRequestHandler.detach(IRequestCycle) line: 128	
	RequestCycle$HandlerExecutor.detach(IRequestHandler) line: 876	
	RequestCycle$HandlerExecutor(RequestHandlerStack).detach() line: 180	
	RequestCycle.onDetach() line: 641	
	RequestCycle.detach() line: 594	
	RequestCycle.processRequestAndDetach() line: 297	
	WicketFilter.processRequestCycle(RequestCycle, WebResponse, HttpServletRequest, HttpServletResponse, FilterChain) line: 261	
	WicketFilter.processRequest(ServletRequest, ServletResponse, FilterChain) line: 203	
	WicketFilter.doFilter(ServletRequest, ServletResponse, FilterChain) line: 284	




Thread [qtp1297836716-57] (Suspended (breakpoint at line 858 in MyWebPage))	
	MyWebPage.onDetach() line: 858	
	MyWebPage(Component).detach() line: 1162	
	AjaxRequestHandler$1(PartialPageUpdate).detach(IRequestCycle) line: 417	
	AjaxRequestHandler.detach(IRequestCycle) line: 277	
	RequestCycle$HandlerExecutor.detach(IRequestHandler) line: 876	
	RequestCycle$HandlerExecutor(RequestHandlerStack).detach() line: 180	
	RequestCycle.onDetach() line: 641	
	RequestCycle.detach() line: 594	
	RequestCycle.processRequestAndDetach() line: 297	
	WicketFilter.processRequestCycle(RequestCycle, WebResponse, HttpServletRequest, HttpServletResponse, FilterChain) line: 261	
	WicketFilter.processRequest(ServletRequest, ServletResponse, FilterChain) line: 203	
	WicketFilter.doFilter(ServletRequest, ServletResponse, FilterChain) line: 284	
{code}

Is this something that can be prevented? If you have a big component tree, detaching twice can be quite expensive.



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