[
https://issues.apache.org/jira/browse/GERONIMO-4543?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12675265#action_12675265
]
Janko Heilgeist commented on GERONIMO-4543:
-------------------------------------------
Hi Kevan,
I've set my JAVA_OPTS to "-XX:MaxPermSize=265m -XX:+UseConcMarkSweepGC
-XX:+CMSClassUnloadingEnabled" for some time now and never saw any OOM errors.
But last Friday I must have accidentally reset the environment variable somehow
without noticing it. On Monday I started seeing the OOM PermGen space errors
immediately during first deployment and began investigating the cause. I didn't
recognize the missing JAVA_OPTS and instead debugged the application with
jmap/jhat. Thus, I noticed that the classes of my EAR never get GCed after
undeploying and that got me hooked up on the issue. Shortly after, I switched
back to the old JAVA_OPTS and everything worked again. But its just my own
private Geronimo installation for development purposes that gets restarted a
few times a day. So the OOM may be pushed back long enough to never occur.
So much for the background. I currently just deploy/undeploy my app and don't
actually drive it. I already noticed a few additional issues when I enable an
included Quartz scheduled job and when I call my JUnitE2 test cases. For now,
I've disabled them and focus just on getting the app GCed after a single
deploy/undeploy. I also noticed that the PermGen space increases minimally
(that is a few KB maybe) with each deploy/undeploy cycle. It's not a serious
issue yet but I'll investigate it further if it continues.
I've only seen the EAR's MultiParentClassLoader, its child WAR's
MultiParentClassLoader, and an intermediate ChildConfigurationClassLoader not
being GCed. SUN's Frank Kieviet describes a servlet in his blog, that
repeatedly loads a class with its own classloader to force a PermGen space GC.
Thus, the relevant classloaders should have been GCed if they had been eligible.
> EAR classloader not garbage collected
> -------------------------------------
>
> Key: GERONIMO-4543
> URL: https://issues.apache.org/jira/browse/GERONIMO-4543
> Project: Geronimo
> Issue Type: Bug
> Security Level: public(Regular issues)
> Components: Memory Leaks, transaction manager
> Affects Versions: 2.2
> Reporter: Janko Heilgeist
> Priority: Blocker
> Fix For: 2.2
>
> Attachments: ear-with-tx.tar.gz, privileged_currenttime.patch
>
>
> The TransactionTimer$CurrentTime thread inherits the AccessControlContext of
> the first EAR/WAR/EJB-jar that carries out a transaction. Thus, the
> particular EAR/WAR/EJB-jar's classloader is prevented from being GCed.
> See http://www.nabble.com/PermGen-space-issues-td22079768s134.html
--
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.
