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Posted to log4j-dev@logging.apache.org by "Gary Gregory (JIRA)" <ji...@apache.org> on 2014/09/10 15:26:28 UTC
[jira] [Updated] (LOG4J2-819) PermGen OutOfMemoryError when
reloading webapp on Tomcat 6
[ https://issues.apache.org/jira/browse/LOG4J2-819?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Gary Gregory updated LOG4J2-819:
--------------------------------
Attachment: gg-cc-clock.patch
How about allowing clock threads to be stopped along the lines of this patch?
> PermGen OutOfMemoryError when reloading webapp on Tomcat 6
> ----------------------------------------------------------
>
> Key: LOG4J2-819
> URL: https://issues.apache.org/jira/browse/LOG4J2-819
> Project: Log4j 2
> Issue Type: Bug
> Components: Core
> Affects Versions: 2.0.2
> Environment: Tomcat 6
> Reporter: Costa Theodosiou
> Priority: Critical
> Attachments: gg-cc-clock.patch
>
>
> When reloading an application 3 or 4 times in Tomcat 6, the application crashes with a "java.lang.OutOfMemoryError: PermGen space" exception.
> After some investigation using the "When all else fails" section of https://wiki.apache.org/tomcat/OutOfMemory in conjunction with Java VisualVM, I have narrowed down the problem to the Thread created within org.apache.logging.log4j.core.util.CoarseCachedClock.
> When a Thread is created, it contains a reference to the classloader that it was created with. In this case, the Thread's contextClassLoader field contains a reference to the WebappClassLoader. When Tomcat attempts to unload the webapp, the Thread still holds onto this reference which prevents WebappClassLoader from being freed.
> Perhaps the Log4jServletContextListener (Log4jWebInitializerImpl) can be made to stop the CoarseCachedClock thread.
> I believe this is not an obvious issue on Tomcat 7 due to https://wiki.apache.org/tomcat/MemoryLeakProtection.
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