RE: How to monitor performance of tomcat

[Jeffrey Janner]

> -----Original Message-----
> From: Randhir Singh [mailto:randhir.si...@sterlite.com]
> Sent: Monday, April 21, 2014 5:17 AM
> To: Tomcat Users List
> Subject: RE: How to monitor performance of tomcat
> 
> Hi,
> 
> I wanted input from the experts on my query below that the port 8891
> does not respond when the command,
> 
> jconsole 10.101.17.79:8891
> 
> is issued when the application hangs and stops responding.
> 
> Requesting inputs so that the root cause analysis of this issue can be
> found out.
> 
> Regards
> 
Randhir -
Your actual first request in this thread was apparently a request for opinions 
on monitoring tools.
This problem of actual hangs wasn't brought up until a week later.
Here is what I've usually found when Tomcat stops responding and even the 
monitoring port is unreachable via jconsole and other tools: Your JVM has 
crashed for some reason.
At this point, you need to refer to the Tomcat logs, your application logs, 
etc. in order to find the root cause.  If the JVM is still "running", try 
taking a couple of thread dumps and review them to find your root cause.
Jeff