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https://issues.apache.org/jira/browse/LOG4J2-578?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14038258#comment-14038258
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Remko Popma commented on LOG4J2-578:
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Scott, I'm a bit unclear on the status of this issue. You mention that matching
the servlet version with the container version mitigates the issue. Does that
mean that the memory leak issue has been resolved?
In your last comment you mention a problem with logging after
undeploying/redeploying your web app.
Could I ask you to check this again with trunk? We've made several improvements
in this area recently.
If the problem still occurs, perhaps it would be better to raise this as a
separate Jira ticket (including your log4j2.xml config and other environment
details).
> 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
> Priority: Critical
> Labels: memory_leak
>
> 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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