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https://issues.apache.org/jira/browse/LOG4J2-222?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13721987#comment-13721987
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Nick Williams commented on LOG4J2-222:
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Nope, I don't think you've missed anything obvious this time. The change you
made to {{catalina.properties}} and {{web.xml}} resolved the issue with Log4j
not shutting down properly. Now you've found a completely unrelated
ThreadLocal-leak. Please file a separate issue for that. You won't need
{{catalina.properties}} or your {{web.xml}}, as they have nothing to do with
this problem. Just include the new Tomcat console output you just showed me,
{{log4j2.xml}}, and {{setenv.sh}}.
By the way, I noticed you're using Java code to log in your {{asynclog.jsp}}.
This isn't causing any problems, but it's not the easiest way to log in JSPs.
You might want to take a look at the [Log4j 2 Tag
Library|http://logging.apache.org/log4j/2.x/log4j-taglib/index.html].
> Async Logger threadpool not shut down by Tomcat shutdown
> --------------------------------------------------------
>
> Key: LOG4J2-222
> URL: https://issues.apache.org/jira/browse/LOG4J2-222
> Project: Log4j 2
> Issue Type: Bug
> Components: Core
> Affects Versions: 2.0-beta5
> Reporter: Remko Popma
> Fix For: 2.0-beta6
>
>
> From the user mailing list - conversation with Steven Yang:
> Looks like Tomcat shutdown checks for memory leaks and notices that the
> Disruptor threadpool used by async loggers has not been shut down.
> Is there any way to pick up a Tomcat shutdown signal and use that to trigger
> log subsystem shutdown?
> -------------------------
> QUOTING STEVEN:
> Thanks, I tried using asyncRoot and everything seems to log fine and I do see
> a lot of logs.
> And logs do seem to be flushed immediately so I do not know if the hook on
> shutdown is been called correctly or not.
> I am using struts and spring so I see a lot of logs (log level at DEBUG) just
> by starting up tomcat, so I am wondering when I use <root> how come I dont
> see any log at all? how much log do I have to write before it starts to flush
> out?
> and one thing I found is that when I use asyncRoot and when I shutdown tomcat
> I see the following message regarding to clearing references and thread local.
> The last one is related to log4j.
> I am trying this on tomcat 6.0.29.
> 四月 28, 2013 8:34:46 上午 org.apache.catalina.loader.WebappClassLoader
> clearReferencesJdbc
> SEVERE: The web application [/test] registered the JBDC driver
> [org.h2.Driver] but failed to unregister it when the web application was
> stopped. To prevent a memory leak, the JDBC Driver has been forcibly
> unregistered.
> 四月 28, 2013 8:34:46 上午 org.apache.catalina.loader.WebappClassLoader
> clearReferencesThreads
> SEVERE: The web application [/test] appears to have started a thread named
> [pool-2-thread-1] but has failed to stop it. This is very likely to create a
> memory leak.
> 四月 28, 2013 8:34:46 上午 org.apache.catalina.loader.WebappClassLoader
> clearThreadLocalMap
> SEVERE: The web application [/test] created a ThreadLocal with key of type
> [java.lang.ThreadLocal] (value [java.lang.ThreadLocal@454e119d]) and a value
> of type [com.opensymphony.xwork2.inject.ContainerImpl] (value
> [com.opensymphony.xwork2.inject.ContainerImpl@8667df7]) but failed to remove
> it when the web application was stopped. This is very likely to create a
> memory leak.
> 四月 28, 2013 8:34:46 上午 org.apache.catalina.loader.WebappClassLoader
> clearThreadLocalMap
> SEVERE: The web application [/test] created a ThreadLocal with key of type
> [java.lang.ThreadLocal] (value [java.lang.ThreadLocal@d7e770]) and a value of
> type [org.apache.logging.log4j.core.impl.Log4jLogEvent] (value
> [Logger=org.springframework.beans.factory.support.DefaultListableBeanFactory
> Level=INFO Message=Destroying singletons in
> org.springframework.beans.factory.support.DefaultListableBeanFactory@61e118f9:
> defining beans
> [org.springframework.context.annotation.internalConfigurationAnnotationProcessor,org.springframework.context.annotation.internalAutowiredAnnotationProcessor,org.springframewo...
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