The following errors occurred when the performance of the wicket
application was tested.

[Trace of error]
[08/12/18 9:53:34:575 JST] 0000003e SystemOut O 2008-12-18
09:53:34,499 ERROR RequestCycle - concurrent access to
HashMap attempted by Thread[WebContainer : 6,5,main]
java.util.ConcurrentModificationException: concurrent access to
HashMap attempted by Thread[WebContainer : 6,5,main]
at java.util.HashMap.onExit(HashMap.java:217)
at java.util.HashMap.transfer(HashMap.java:514)
at java.util.HashMap.resize(HashMap.java:500)
at java.util.HashMap.addEntry(HashMap.java:800)
at java.util.HashMap.put(HashMap.java:441)
at 
org.apache.wicket.protocol.http.WebApplication.addBufferedResponse(WebApplication.java:639)
at 
org.apache.wicket.protocol.http.WebRequestCycle.redirectTo(WebRequestCycle.java:201)
at 
org.apache.wicket.request.target.component.PageRequestTarget.respond(PageRequestTarget.java:58)
at 
org.apache.wicket.request.AbstractRequestCycleProcessor.respond(AbstractRequestCycleProcessor.java:104)
・・・

[Test environment]
OS:AIX5.3 TL005 +WAS6.1.0.21
Java:JDK1.5.0
Wicket:wicket1.3.5

[Consideration And Question]
I think that it is a cause that the bufferedResponses instance of the
WebApplication class is not the thread safe.

The sessionDestroyed method and the addBufferedResponse method of the
WebApplication class might have to be controlled exclusively(When
these methods were declared in synchronized, the problem was
canceled).

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