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From Jeff Genender <jgenen...@savoirtech.com>
Subject Re: ClassLoader memory leaks
Date Mon, 07 Nov 2005 23:06:26 GMT
Have you run a profiler to see where the leaks are occurring?

Matt Hogstrom wrote:
> 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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