ConcurrentModificationException while using iterator in PreResultListener.beforeResult(..) method.

[Florian Beckmann <be...@servtag.com>]

Hi all,

I'm new to struts2 (using since 2 weeks) and any help with the following 
problem would be appreciated.

Based on the code of DebuggingInterceptor ( 
http://www.koders.com/java/fidE2D023ADB255C18F527B41456AA4BAAE2BDE3F43.aspx?s=xml#L45 ) 
I wrote an interceptor which collects statistical data.
Like in the interceptor above the ActionContext's ValueStack is traversed in 
an anonymous PreResultListener. When iterating through the collection (debug 
says its of type collection com.opensymphony.xwork2.util.CompoundRoot, with 
name valueStack[com.opensymphony.xwork2.util.CompoundRoot])  I get a 
java.util.ConcurrentModificationException.
Since I have no fields in my interceptor (holding NO state) and I'm not 
modifying the Collection/Iterator it must happen in another thread running at 
the same time, right? Any Ideas when/how this could happen?

regards
Florian

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