Erik Wienhold created WICKET-6374:
-------------------------------------

             Summary: Exception caused by border extending another border with 
<wicket:extend>
                 Key: WICKET-6374
                 URL: https://issues.apache.org/jira/browse/WICKET-6374
             Project: Wicket
          Issue Type: Bug
          Components: wicket
    Affects Versions: 8.0.0-M5, 7.7.0
            Reporter: Erik Wienhold
         Attachments: myproject.tar.gz

Border components extended from a custom border component with 
{{<wicket:extend>}} fail to render in 7.7.0 (see stacktrace) and 8.0.0-M5. It 
renders fine with 7.6.0. The upgrade to 7.7.0 is necessary to get the fix for 
https://issues.apache.org/jira/browse/WICKET-6303.

{noformat}
org.apache.wicket.WicketRuntimeException: An error occurred while detaching 
component: [MyExtendedBorder [Component id = border, page = 
com.mycompany.HomePage, path = border, type = com.mycompany.MyExtendedBorder, 
isVisible = true, isVersioned = true, markup = [markup = 
file:/home/janedoe/myproject/target/classes/com/mycompany/HomePage.html
<div wicket:id="border">[body]</div>, index = 0, current =  '<div 
wicket:id="border">' (line 0, column 0)]], children =  [BorderBodyContainer 
[Component id = border_body]]]
        at org.apache.wicket.Component.detach(Component.java:1182)
        at 
org.apache.wicket.MarkupContainer.detachChildren(MarkupContainer.java:1761)
        at org.apache.wicket.Component.detach(Component.java:1187)
        at 
org.apache.wicket.core.request.handler.PageProvider.detach(PageProvider.java:330)
        at 
org.apache.wicket.core.request.handler.RenderPageRequestHandler.detach(RenderPageRequestHandler.java:156)
        at 
org.apache.wicket.request.cycle.RequestCycle$HandlerExecutor.detach(RequestCycle.java:906)
        at 
org.apache.wicket.request.RequestHandlerStack.detach(RequestHandlerStack.java:180)
        at 
org.apache.wicket.request.cycle.RequestCycle.onDetach(RequestCycle.java:641)
        at 
org.apache.wicket.request.cycle.RequestCycle.detach(RequestCycle.java:594)
        at 
org.apache.wicket.request.cycle.RequestCycle.processRequestAndDetach(RequestCycle.java:297)
        at 
org.apache.wicket.protocol.http.WicketFilter.processRequestCycle(WicketFilter.java:261)
        at 
org.apache.wicket.protocol.http.WicketFilter.processRequest(WicketFilter.java:203)
        at 
org.apache.wicket.protocol.http.WicketFilter.doFilter(WicketFilter.java:284)
        at 
org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1652)
        at 
org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:585)
        at 
org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143)
        at 
org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:577)
        at 
org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:223)
        at 
org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1127)
        at 
org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:515)
        at 
org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:185)
        at 
org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1061)
        at 
org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)
        at 
org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:97)
        at org.eclipse.jetty.server.Server.handle(Server.java:499)
        at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:311)
        at 
org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:257)
        at 
org.eclipse.jetty.io.AbstractConnection$2.run(AbstractConnection.java:544)
        at 
org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:635)
        at 
org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:555)
        at java.lang.Thread.run(Thread.java:745)
Caused by: org.apache.wicket.WicketRuntimeException: Detach called on component 
with id 'border' while it had a non-empty queue: ComponentQueue{queueSize=1, 
queue=[[BorderBodyContainer [Component id = border_body]], null, null, null, 
null, null, null, null]}
        at org.apache.wicket.MarkupContainer.onDetach(MarkupContainer.java:1943)
        at org.apache.wicket.Component.detach(Component.java:1163)
        ... 30 more

Caused by:

org.apache.wicket.WicketRuntimeException: Detach called on component with id 
'border' while it had a non-empty queue: ComponentQueue{queueSize=2, 
queue=[[BorderBodyContainer [Component id = border_body]], null, null, null, 
null, null, null, null]}
        at org.apache.wicket.MarkupContainer.onDetach(MarkupContainer.java:1943)
        at org.apache.wicket.Component.detach(Component.java:1163)
        at 
org.apache.wicket.MarkupContainer.detachChildren(MarkupContainer.java:1761)
        at org.apache.wicket.Component.detach(Component.java:1187)
        at 
org.apache.wicket.core.request.handler.PageProvider.detach(PageProvider.java:330)
        at 
org.apache.wicket.core.request.handler.RenderPageRequestHandler.detach(RenderPageRequestHandler.java:156)
        at 
org.apache.wicket.request.cycle.RequestCycle$HandlerExecutor.detach(RequestCycle.java:906)
        at 
org.apache.wicket.request.RequestHandlerStack.detach(RequestHandlerStack.java:180)
        at 
org.apache.wicket.request.cycle.RequestCycle.onDetach(RequestCycle.java:641)
        at 
org.apache.wicket.request.cycle.RequestCycle.detach(RequestCycle.java:594)
        at 
org.apache.wicket.request.cycle.RequestCycle.processRequestAndDetach(RequestCycle.java:297)
        at 
org.apache.wicket.protocol.http.WicketFilter.processRequestCycle(WicketFilter.java:261)
        at 
org.apache.wicket.protocol.http.WicketFilter.processRequest(WicketFilter.java:203)
        at 
org.apache.wicket.protocol.http.WicketFilter.doFilter(WicketFilter.java:284)
        at 
org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1652)
        at 
org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:585)
        at 
org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143)
        at 
org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:577)
        at 
org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:223)
        at 
org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1127)
        at 
org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:515)
        at 
org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:185)
        at 
org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1061)
        at 
org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)
        at 
org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:97)
        at org.eclipse.jetty.server.Server.handle(Server.java:499)
        at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:311)
        at 
org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:257)
        at 
org.eclipse.jetty.io.AbstractConnection$2.run(AbstractConnection.java:544)
        at 
org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:635)
        at 
org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:555)
        at java.lang.Thread.run(Thread.java:745)
{noformat}

The class hierarchy is as follows:

{code:java}
class MyBorder extends Border
class MyExtendedBorder extends MyBorder
{code}

{{MyBorder}} uses {{<wicket:border>}} and includes {{<wicket:body/>}} and 
{{<wicket:child/>}}. {{MyExtendedBorder}} uses {{<wicket:extend>}} and is used 
on the page.



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