I recently added support to Jopr, The JBoss management platform project
( http://www.jboss.org/jopr ) to be able to monitor Hibernate via the
Hibernate Statistics MBean.
For background, see my blog entry:
http://management-platform.blogspot.com/2008/11/monitoring-hibernate.html
and more specifically, see the demo flash:
https://docs.jbosson.redhat.com/confluence/display/JON2/Demo-MonitoringHibernate
If you watch that demo, you can see how useful the Hibernate Statistics
data can be (e.g. when used by external management tools like Jopr you
can track the performance of Hibernate over time, send alerts based on
that performance data, etc. etc.).
But for users to be able to monitor their Hibernate applications from an
external management tool, it isn't enough for them to specify the
"hibernate.generate_statistics" configuration setting. They must expose
those statistics via JMX; however, that puts a burden on the Hibernate
developer to write special code to do this (as the example code in the
blog illustrates - see Max's comments on my blog and my responses also).
Out of that, I submitted this JIRA:
http://opensource.atlassian.com/projects/hibernate/browse/HHH-3593
Last night I wrote the code that implements this enhancement request and
attached the patch to that JIRA. The short of it is, the Hibernate
developer no longer has to write any Java code to expose the statistics
via JMX, all you have to do is set these configuration settings:
hibernate.generate_statistics.jmx=true
hibernate.generate_statistics.jmx.object_name=hibernate:type=statistics,application=foo
hibernate.generate_statistics.jmx.mbeanserver=*platform*
If you set those, statistics generation will be turned on, the Hibernate
Statistics MBean will be exposed via JMX and if you enabled the VM for
remote JMX, you can immediately begin to monitor Hibernate (you'll even
see the Hibernate MBean via jconsole, though things like Jopr will
provide better functionality like viewing historical stat data, alerting
and the like).
As the JIRA mentions, this patch does NOT introduce any JMX compile-time
dependencies (due to the requirement that Hibernate be able to support
JDK 1.4). Therefore, you will not see any "javax.management.*" imports
or classes being used directly (they are used via reflection). However,
if you enable this JMX statistics feature, obviously, you must run in
JRE 5+ or JRE 1.4 + JMX libraries - if you do not, this code will log
error messages saying what the problem is and simply disable the JMX
stats capability (but otherwise, hibernate works normally).
Any suggestions how I might further this along to get it merged? Or is
this patch good enough for some Hibernate developer to merge it in and
take it over?
John Mazz
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