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https://issues.apache.org/jira/browse/LOG4J2-500?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13891975#comment-13891975
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Remko Popma commented on LOG4J2-500:
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I may need some help with this...
With the current version of trunk, MBeans are not unregistering when a webapp
is undeployed. As far as I can tell, the {{LoggerContext.stop()}} method is
never called. I've tested on Tomcat 7.0.50 and 8.0.1.
I have log4j-api and log4j-core jar files in WEB-INF/lib, and a jsp file that
instantiates a {{Logger}} and calls {{logger.info()}} on it. No listeners or
anything. Displaying the JSP page in a browser correctly causes the MBeans to
get registered.
I expected the {{Log4jWebInitializerImpl.deinitialize()}} method to be called,
but I don't see the log message {{"Removing LoggerContext for " + this.name +
"."}} in the console or in any log file...
On the same hand, I also cannot find any _initialization_ log messages. (I
expected to see the {{"Log4jServletContainerInitializer starting up Log4j in
Servlet 3.0+ environment."}} message somewhere but cannot find it.)
> Unloading one webapp unloads JMX MBeans for all webapps
> -------------------------------------------------------
>
> Key: LOG4J2-500
> URL: https://issues.apache.org/jira/browse/LOG4J2-500
> Project: Log4j 2
> Issue Type: Bug
> Components: JMX
> Affects Versions: 2.0-rc1
> Reporter: Remko Popma
> Assignee: Remko Popma
>
> As a stopgap solution for LOG4J2-406, all MBeans are unregistered when a
> LoggerContext is stopped.
> In an application server, multiple web applications can be deployed and
> undeployed independently and a better solution would only unregister the
> MBeans associated with the web application that is being undeployed.
> Current MBean ObjectNames look like this (simplified):
> {code}
> ...StatusLogger
> ...ContextSelector
> ...LoggerContext,ctx=%s
> ...LoggerConfig,ctx=%s,name=%s
> ...Appender,ctx=%s,name=%s
> ...
> {code}
> Assuming that every web application has a unique name, and this name becomes
> the name of the LoggerContext, then one solution would be to create
> StatusLogger and ContextSelector MBeans that have the LoggerContext name in
> their ObjectName:
> {code}
> ...StatusLogger,ctx=%s
> ...ContextSelector,ctx=%s
> ...LoggerContext,ctx=%s
> ...LoggerConfig,ctx=%s,name=%s
> ...Appender,ctx=%s,name=%s
> ...
> {code}
> This way, every web application would have its own StatusLogger and
> ContextSelector MBeans. The MBeans may point to the same (shared) underlying
> StatusLogger and ContextSelector objects. When a web application is
> undeployed, unregistering all MBeans associated with the LoggerContext will
> not affect any MBeans associated with another web application (which has it
> own, separate, LoggerContext).
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