[logback-user] Logback JMX Operations and Attributes

LogbackUser amits.84 at gmail.com
Thu Apr 28 15:17:21 CEST 2011

On debugging more I found that the issue was because logback has a check to
not register a bean if its already registered. This creates a issue with
glassfish since glassfish creates two classloaders for each web application.
The first one is a temporary one which is later destroyed. The problem
arises because the logback JMX mbean is instantiated with this temporary
classloader and registered with the mbean server. 
Since re-registration is not done any operations on the logback jmx mbean
through jconsole fail.

A workaround to this is to not add the jmxconfigurator tag in the
configuration file and register the logback jmx bean manually in a servlet
context listener.

LogbackUser wrote:
> Is there a way to delay the start up of the jmx mbean? 
> While debugging glassfish source code (build 43) I found that the mbean
> refers to the webappclassloader instance which was destroyed and hence the
> below error. I am suspecting that the JMX MBean gets started before the
> glassfish server is properly started and hence it gets an incorrect
> reference to the classloader.
> Any help would be appreciated.
> Thanks,
> LogbackUser wrote:
>> I am using glassfish 3.1 as my application server and I have enabled JMX
>> by adding the <jmxConfigurator/> tag in the logback.xml. 
>> I am able to view the logback classic mbeans on jconsole but invoking
>> operations like getLoggerLevel fails with an error - "Problem invoking
>> getLoggerLevel : java.lang.IllegalStateException: WEB9031:
>> WebappClassLoader unable to load resource[java.lang.Object], because it
>> has not been started or was always stop...."
>> Accessing the "LoggerList" attribute also does not give any output.
>> Statuses attributes shows the status messages though.
>> Is there anything I am missing in terms of configuration?

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