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From "Caldarale, Charles R" <Chuck.Caldar...@unisys.com>
Subject RE: Tomcat 7 - No modifications are allowed to a locked ParameterMap
Date Wed, 02 May 2012 21:17:46 GMT
> From: David Wall [mailto:d.wall@computer.org] 
> Subject: Tomcat 7 - No modifications are allowed to a locked ParameterMap

> May 2, 2012 1:55:03 AM org.apache.catalina.core.ApplicationDispatcher invoke
> SEVERE: Servlet.service() for servlet jsp threw exception
> java.lang.IllegalStateException: No modifications are allowed to a 
> locked ParameterMap

Both this symptom and your earlier one about creating a session after a response has been
committed are representative of the kinds of errors seen when a webapp stores references in
an inappropriate scope.  For example, keeping a reference to a request or response object
in a static field, a session, or a thread-local, will often result in the wrong object being
used later on.  This is especially evident under high-load situations...

 - Chuck


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