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From "Mauro Molinari (JIRA)" <j...@apache.org>
Subject [jira] [Created] (LOG4J2-938) org.apache.logging.log4j.core.jmx.Server never shuts down the ExecutorService it creates
Date Thu, 15 Jan 2015 10:50:34 GMT
Mauro Molinari created LOG4J2-938:
-------------------------------------

             Summary: 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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