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From Matt Hogstrom <m...@hogstrom.org>
Subject Re: ClassLoader memory leaks
Date Mon, 07 Nov 2005 22:26:25 GMT
Kevan,

Big thanks for tracking down these issues.  I know they aren't easy.

Matt

Kevan Miller wrote:
> I've been battling a variety of ClassLoader-based memory leaks that occur
> during the deploy/undeploy of DayTrader. With the patches for the following
> problems, I no longer see MultiParentClassLoaders being leaked:
> 
> http://issues.apache.org/jira/browse/GERONIMO-1125 (patch just posted)
> http://issues.apache.org/jira/browse/GERONIMO-1118 (fix committed)
> http://issues.apache.org/jira/browse/AXIS-2232 (Old patch didn't fix the
> problem. I've attached a new patch that fixes the problem. Yet to be
> committed)
> http://issues.apache.org/jira/browse/AXIS-2278 (Fix committed, but not
> picked up by Geronimo build)
> 
> Deployment of DayTrader is still leaking memory (but only 200 kbytes per
> deploy/undeploy cycle. "only" is a relative term... ;-). So, there's still
> work to be done.
> 
> Finally, there is an intermittent problem which will cause a Thread to
> temporarily hold on to a ClassLoader. Since the problem is intermittent and
> temporary, I'm not actively pursuing. I'll document the problem in a jira,
> but here's the chain of references keeping the ClassLoader alive... The
> Thread is in the RMI Runtime ThreadGroup.
> 
> java.lang.Thread.inheritedAccessControlContext -->
> java.security.AccessControlContext.context -->
> java.security.ProtectionDomain[4] -->
> java.security.ProtectionDomain.classLoader -->
> org.apache.geronimo.kernel.config.MultiParentClassLoader
> 
> --kevan
> 


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