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From "Remko Popma (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (LOG4J2-578) JMX Memory Leak in Servlet Container
Date Sun, 08 Nov 2015 07:31:12 GMT

     [ https://issues.apache.org/jira/browse/LOG4J2-578?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Remko Popma resolved LOG4J2-578.
    Resolution: Fixed

After resolving LOG4J2-1176 I can no longer reproduce this issue.
I believe it has been fixed.

Please verify and close.

> JMX Memory Leak in Servlet Container
> ------------------------------------
>                 Key: LOG4J2-578
>                 URL: https://issues.apache.org/jira/browse/LOG4J2-578
>             Project: Log4j 2
>          Issue Type: Bug
>          Components: Core
>    Affects Versions: 2.0-rc1
>         Environment: Ubuntu 12.04
> Linux 3.2.0-58-generic x86_64 GNU/Linux
> 8 GB RAM
> java version "1.7.0_51"
> Java(TM) SE Runtime Environment (build 1.7.0_51-b13)
> Java HotSpot(TM) 64-Bit Server VM (build 24.51-b03, mixed mode)
> JAVA_OPTS=-Xmx1024m -Dsun.net.inetaddr.ttl=60 -Dsun.net.inetaddr.negative.ttl=60 -Djava.net.preferIPv4Stack=true
-XX:PermSize=128m -XX:MaxPermSize=256m -XX:+UseConcMarkSweepGC -XX:+CMSClassUnloadingEnabled
>            Reporter: Scott
>            Assignee: Remko Popma
>            Priority: Critical
>              Labels: memory_leak
>             Fix For: 2.5
>         Attachments: smem.tar.gz
> If JMX is enabled in Log4j2 (it is by default) and a web application is unloaded then
Log4j2 creates a memory leak. This can be observed by deploying a web application to tomcat7
and exercising the stop, undeploy, or redeploy actions. The "unloaded" terminology is meant
to be generic across servlet containers in that any action which is designed to make the web
application classes eligible for GC.  The memory leak is believed to be caused by log4j for
the following reasons:
> 1)Heap Dump reveals the classloader instance responsible for the WAR plugin (for tomcat7
is of type {code}org.apache.catalina.loader.WebappClassLoader{code}) has 1 non weak/soft reference
which is of type {code}org.apache.logging.log4j.core.jmx.LoggerContextAdmin{code} after the
WAR has been stopped or undeployed.
> 2) Disabling JMX in Log4j2 (see [http://logging.apache.org/log4j/2.x/manual/jmx.html])
results in no memory leaks and all resources are GC as expected.

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