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From "Cohen, Laurence" <lco...@novetta.com>
Subject Re: Tomcat Application Stops Responding
Date Mon, 16 Nov 2015 22:11:49 GMT
Thanks for pointing out these tools.

Larry Cohen

On Mon, Nov 16, 2015 at 5:06 PM, Tauzell, Dave <Dave.Tauzell@surescripts.com
> wrote:

> A monitoring tool like App Dynamics will give you lots of info but some
> quicker tests you can do with built-in tools:
>
> - Check that the CPU on  your server is not at 100%
> - Use jstack to get a stack dump:
> http://docs.oracle.com/javase/7/docs/technotes/tools/share/jstack.html .
>   I will take a couple stack traces with a few seconds in between each and
> then see if all my threads are stuck somewhere.
> - Use jstat (with the gcutil option) to print out Garbage Collection
> issues:
> https://docs.oracle.com/javase/8/docs/technotes/tools/unix/jstat.html .
> Something to look for is lots of full GCs or really long GC times.
>
> The VisualVM tool can call the above utilities and show GC info in a
> graphical manner.  It might be easy to use depending on the network between
> your app and where you run VisualVM.
>
> -Dave
>
> -----Original Message-----
> From: Cohen, Laurence [mailto:lcohen@novetta.com]
> Sent: Monday, November 16, 2015 3:43 PM
> To: Tomcat Users List
> Subject: Tomcat Application Stops Responding
>
> Hi Everyone,
>
> Are there any tools that come with Java that I can use to troubleshoot an
> intermittent problem we are having?  The problem is that several times a
> day, our Tomcat applications will stop responding and I'll have to restart
> them to get them working again.  It's gotten to the point where I have
> written a script which does a wget every 10 minutes against an object in
> the DB, and if it fails, it will restart our apps.  I've also done some
> statistics gathering and imported them into a spreadsheet so I can see what
> is going on at the time the system is crashing.  All I can see is that the
> Tomcat connections are spiking.
>
> We are running Tomcat 7.0.59 with two apps, Postgres 9.2 on the backend
> which is not administered by us, and httpd on the front end, 2.2.15.  The
> httpd server and app server are RHEL6.
>
> Thanks,
>
> Larry
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-- 

[image: www.novetta.com]

Larry Cohen

System Administrator


12021 Sunset Hills Road, Suite 400

Reston, VA 20190

Email  lcohen@novetta.com

Office  703-885-1064

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