[logback-dev] [JIRA] Commented: (LBCLASSIC-33) unregistering in the jmx plugin

[Ceki Gulcu (JIRA)]

    [ http://jira.qos.ch/browse/LBCLASSIC-33?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=10888#action_10888 ] 

Ceki Gulcu commented on LBCLASSIC-33:
-------------------------------------

Joern,

After further investigation, I can see the previous instance of
LoggerContext, created when the web-app is initialized, being
finalized when the web-app is stopped. In practice, I have to invoke
System.gc() from jconsole to provoke the garbage collection of the
LoggerContext. As far as I can tell, the code in revision 1945 works
well, as it should.

Unfortunately, when I use the jmap/jhat tools for a very strange and
unexplained reason, there still remains a reference to LoggerContext
instance, which is extremely strange since I can guarantee that the
only instance of LoggerContext created was garbage collected.

I am attaching  a copy of the jmap  dump in case you'd like  to have a
look at  it. At  this stage, I  am quite  tempted to declare  that the
problem lies in jmap/jhat or  alternatively my poor knowledge of those
tools.

Joern,

After further investigation, I can see the previous instance of
LoggerContext, created when the web-app is initialized, being
finalized when the web-app is stopped. In practice, I have to invoke
System.gc() from jconsole to provoke the garbage collection of the
LoggerContext. As far as I can tell, the code in revision 1945 works
well, as it should.

Unfortunately, when I use the jmap/jhat tools for a very strange and
unexplained reason, there still remains a reference to LoggerContext
instance, which is extremely strange since I can guarantee that the
only instance of LoggerContext created was garbage collected.

I am attaching  a copy of the jmap  dump in case you'd like  to have a
look at  it. At  this stage, I  am quite  tempted to declare  that the
problem lies in jmap/jhat or  alternatively my poor knowledge of those
tools.


> unregistering in the jmx plugin
> -------------------------------
>
>                 Key: LBCLASSIC-33
>                 URL: http://jira.qos.ch/browse/LBCLASSIC-33
>             Project: logback-classic
>          Issue Type: Bug
>          Components: Other
>    Affects Versions: unspecified
>         Environment: Operating System: All
> Platform: All
>            Reporter: Hontvári József
>            Assignee: Ceki Gulcu
>
> I started using the JMX plugin of login, and I wondered how should I
> shut it down when a web application is restarted. I haven't found a
> function which unregisters the Configurator MBean. This object holds a
> reference (through ContextAwareBase) to a Context. I am afraid that not
> unregistering it causes a memory leak when a web application is restarted. 
> There should be a way to shutdown the JMX plugin. Or more generally an API to shut down the Logback system in its entirety: flush buffers, close files etc. It must be decided what to do if a log request arrives when or after logback is shutting down.

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