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André-John,

On 5/11/2009 6:48 PM, Andre-John Mas wrote:
> We have recently put into production a Tomcat 5.5.27 based web site,
> using JDK 1.6 (JDK 1.6.0_12-b04 on RedHat Linux). We have spent months
> developing and testing the site, both by us and the customer, and
> experienced no VM crashes. Now that we are in production we find the VM
> is crashing from time to time.

JVM crashes are no good :(

> Looking at my catalina log I see:
> 
> [2009-05-08 01:22:33,174] ERROR (StandardWrapperValve.java:260) -
> Servlet.service() for servlet action threw exception
> java.lang.IllegalStateException

This is unlikely to be causing any JVM crash.

> I doubt this would be enough to destabilize a VM? We have a second
> filter that might be picky about the order that it is called, and we
> will look into this, but not being able to reproduce this issue in a
> non-production environment is making it challenging.

It's pretty much impossible to crash the JVM intentionally just using
Java code. You have to go JNI to do that.

I would (as always) be suspicious of the physical hardware. Try taking
one of the servers out of service and run a memory/cpu test on it. I'll
bet it's got bad memory.

You didn't give any details of the crash. I'm guessing SIG11?

- -chris
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