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Subject Re: OutOfMemoryException while redeploying WAR
Date Wed, 25 Apr 2007 14:37:14 GMT
It's related to the way Sun's JVM handles class data and internalized 
string. They make the assumption that you'd never want that information 
flushed from the VM, so they put that chunk of memory out of the reach of 
the garbage collector (i.e. "permanent generation"). Unfortunately, when 
you redeploy an application, you're really attempting to remove a bunch of 
classes and replace them with new ones. That simply doesn't work with 
Sun's VM; you only end up with both the old and the new classes in 
PermGen, even if the old class data is no longer useful or even 

There's no way around this one if you're using Sun's VM. Raising the 
amount of memory available for the permanent generation is really only a 
stop gap measure. If you feel you're going to redeploy your app very 
often, you should look into using another VM. I personally use JRockit for 
development (which is when I do most of my redeployment), even if I only 
run Sun's VM for staging and production servers (in order to take 
advantage of the deeper testing done on that VM).

Hope it helps.

Denis Robert
Senior Technical Architect
BF&M Insurance Group
Phone: (441) 298-0344
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Dario Andrade <> 
04/25/2007 11:31 AM
Please respond to


Re: OutOfMemoryException while redeploying WAR

That has to do with the PermSize. It is the classloader's memory.

Set -XX:MaxPermSize=256M at startup.


Jochen Zink escreveu:
> Hello,
> I'm using Geronimo 1.1.1 and have a problem.
> I'm developing a little JSF-Webapplication. First, I deploy the WAR to 
geronimo and after modifiying the sources I redploy the application WAR. 
That works fine. But after a while, I get OutOfMemory Exceptions while 
redeploying. After restarting Geronimo, everythink is fine.
> Is this a bug, or a kind of "wrong use of redeploy"?
> Thanks
> regards
> Jochen Zink
> Mit der Gruppen-SMS von WEB.DE FreeMail k├Ânnen Sie eine SMS an alle 
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