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https://issues.apache.org/jira/browse/WICKET-5998?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15006064#comment-15006064
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Martin Grigorov commented on WICKET-5998:
-----------------------------------------
Thinking on this problem I realize that if we use a flag to indicate that the
page is detached then there is no place where to reset this flag. Usually this
place is #detach() itself.
Using 'transient' won't help because the pages used in the last request are
kept alive in the http session.
The only way I see is to add extra logic in
org.apache.wicket.request.RequestHandlerStack#detach() and track the detached
pages for IPageClassRequestHandler's.
Any better ideas?
> 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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