> From: Emerson, Christopher [mailto:cemer...@orangelake.com] 
> Subject: Please help ... [MultiThreadedHttpConnectionManager cleanup]

> Ever since we've upgraded to Tomcat 6 4 weeks ago, I've been fighting
> the following error on shutdown ...

You've actually had the error all along, but it's only the recent Tomcat 
versions that have been detecting and reporting it.

> Nov 23, 2010 4:42:18 PM org.apache.catalina.loader.WebappClassLoader
> clearReferencesThreads
> SEVERE: A web application appears to have started a thread named
> [MultiThreadedHttpConnectionManager cleanup] but has failed to stop it.
> This is very likely to create a memory leak.

Your webapp has started an auxiliary thread, but not terminated it promptly.  
You should be using a ServletContextListener that insures any such extra 
threads have terminated before returning from its contextDestroyed() method.

 - Chuck


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