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https://issues.apache.org/jira/browse/LOG4J2-938?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14286034#comment-14286034
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Gary Gregory commented on LOG4J2-938:
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Thank you for your report. Patches are welcome...
> org.apache.logging.log4j.core.jmx.Server never shuts down the ExecutorService
> it creates
> ----------------------------------------------------------------------------------------
>
> Key: LOG4J2-938
> URL: https://issues.apache.org/jira/browse/LOG4J2-938
> Project: Log4j 2
> Issue Type: Bug
> Components: JMX
> Affects Versions: 2.1
> Reporter: Mauro Molinari
> Priority: Critical
>
> The class {{org.apache.logging.log4j.core.jmx.Server}} creates an
> {{ExecutorService}} at construction time and and stores it as an instance
> variable of type {{Executor}} (named {{executor}}).
> This executor service is never shut down (I guess the {{unregisterMBeans()}}
> methods may be good candidates, with some care for
> {{unregisterMBeans(MBeanServer)}} which performs unregistration only for a
> single {{MBeanServer}}). This causes a memory leak if Log4j is used in a web
> application (under Tomcat, for instance) and the JMX services have been used
> (i.e.: the {{Server}} class has been instantiated).
> But even worse, what I'm observing is that a notification Job may be
> submitted to that executor by
> {{javax.management.NotificationBroadcasterSupport.sendNotification(Notification)}},
> invoked by
> {{org.apache.logging.log4j.core.jmx.StatusLoggerAdmin.log(StatusData)}} in
> certain circumstances exactly during Tomcat shutdown process: since the
> executor is using non-daemon threads to execute tasks, this eventually
> prevents the application server to shutdown (I have to kill it).
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