I've been running Tomcat for many versions now, mostly without incident.
However with the latest set of upgrades rather "forced" upon me all at
once (instead of managed more properly), my application appears to have
a severe memory leak.
System Info: OS is Solaris 10-u5 (2008); java 1.6.0_06-b02;
apache-tomcat-6.0.16; mysql 5.0.51a-solaris10-x86_64. I have fast
servers and plenty of memory (8 gigs). I'm running 1 gig stack and
getting at least 2 GC/stack exceptions per day (sometimes more). Yes -
it's a user/use triggered leak but I can't trace it further yet.
Of course what is odd is that there was NO memory leak using older
versions of this stuff (Solaris 10 (2006), java 1.5.x, tomcat 5.5.12,
mysql 5.0.16). I'm sure the memory leak was there, but it was "well
masked". On the older system I was running 512 meg stack and it never
gave GC or stack errors.
So, while I am actively trying to fix the memory leak, I still have to
maintain these production servers at operatonal status (politics - don't
ask). However, it's difficult as the memory leak is causing repeated GC
and "out of stack" exceptions.
What I've noticed recently is that when using the manager application, I
can watch the memory utilization grow and more memory get allocated (via
refreshing the page), right up until the stack is used up and the main
application crashes. However, if I'm watching it grow, and then log on
to the server and reset tomcat (stop and then start tomcat), the memory
use is back at the start. Thanks to session persistence, no users are
"harmed" during this exercise.
So for the moment, while I try and debug the application, I can keep
things running by having a cron job periodically reset tomcat for me.
But this is really crude. Until I fix the memory leak, I'd like
something a little bit more elegant.
SO - my question - is there a relatively easy way to create something
(say a servlet) to watch the stack *just like I can do manually using
the manager application* but email me when the stack approaches the
memory limits?
Thanks,
-Richard
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