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James,

On 3/25/14, 12:00 PM, James H. H. Lampert wrote:
> On 3/24/14 11:06 AM, Christopher Schultz wrote:
> 
>> Do you have any idea what the cause in your particular case?
> 
> I didn't yesterday; it would be putting it mildly that there's
> very little of my own code in the Tomcat context (almost all of it
> in a layer that communicates with an AS/400-native server, whose
> communication layer is also my own code).
> 
> Then I heard back from one of the fellows who DID write the Tomcat
> app.
> 
> It uses BIRT, and evidently BIRT has some kind of a bug that leaks 
> "perm" space:
> 
> https://bugs.eclipse.org/bugs/show_bug.cgi?id=339191 
> https://bugs.eclipse.org/bugs/show_bug.cgi?id=373761

Those are definitely leaks in whatever BIRT is, but they should only
be a problem if you are restarting your web application periodically
without restarting Tomcat. Are you doing that?

If you aren't, then your OOME is coming from somewhere else. Do you
get any message at all along with the "OutOfMemoryError" -- the JVM
will usually say "PermGen" or "Heap" or something else.

The best way I've found to detect OOME is to use the
- -XX:OnOutOfMemoryError flag for the JVM. I have no idea how that will
(or will not) work on an AS/400.

- -chris
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