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From "Robin Rigby" <ro...@gondolier.org.uk>
Subject RE: PermGen space problem with Cocoon on Tomcat
Date Sat, 21 Jul 2007 23:45:53 GMT
I had a similar thing a month or two ago.

I spent a lot of time looking in vain for a classloader leak.  It turned out
Cocoon needs more memory (on my system) than the Tomcat default.

Have you tried making more memory available to Tomcat?  I added memory
options to the script that launches Tomcat.  Something like

     -Xms256m \
     -Xmx512m \
     -XX:PermSize=64m \
     -XX:MaxPermSize=256m \
	etc  

Problem gone.  I don't think there is a classloader leak (on my machine,
anyway).

I wrote a little script to log the permgen statistics as Tomcat starts up.  

hth
 
Robin
 

-----Original Message-----
From: Stephen Winnall [mailto:steve@winnall.ch] 
Sent: 21 July 2007 23:55
To: users@cocoon.apache.org
Subject: Re: PermGen space problem with Cocoon on Tomcat

I don't know how much memory the machine has. I have read various  
articles on the net which have suggested increasing the memory  
available to Tomcat's JVM (part of what Christoph suggested), but the  
consensus seems to be that this merely defers the problem rather than  
solving it. Memory leaks chew up memory until there is none left:  
it's just a matter of how long it takes!

At the moment I'm concentrating on the JDBC hypothesis. If the  
problem comes round again after that, there are two further  
possibilities:

1) references (pointers) from outside the application to classes  
within the application (non-JDBC)
2) memory size

I'm planning on taking them in that order. Although my instinct says  
"fix the basic problem", if I only have to restart Tomcat say every  
two weeks I may go with that if the solution proves too elusive.

Steve

On 21 Jul 2007, at 16:18, Jonathan Hipkiss wrote:

> Do you know how much memory the machine has?  We were getting this  
> on a Solaris 10 server with 1gb of Ram which we doubled and the  
> problem went away.
>
> Jonathan
>
> Stephen Winnall wrote:
>> Hi Antonio, Christoph
>>
>> I'm using Cocoon 2.1.9 on Tomcat 5.5.23 with Sun's Java 1.5.0_11- 
>> b03 on Linux 2.6.18-4-amd64 (not sure which distro: it's at my  
>> provider's site).
>>
>> Christoph's suggestions tally with things I've discovered on the  
>> net in the last couple of hours. I'll run them past my provider.
>>
>> Another possibility seems to be JDBC: if the jar file is under WEB- 
>> INF/lib the garbage collector cannot release resources held by the  
>> database. Guess where my postgresql.jar is...
>>
>> Part of my problem is that I develop under Mac OS X and just  
>> restart Tomcat when things go wrong in my development environment:  
>> deploying to a completely different platform is forcing me to be  
>> more rigorous.
>>
>> Steve
>>
>>
>> On 20 Jul 2007, at 21:03, Antonio Gallardo wrote:
>>
>>> Hi Stephen, would you provide more info?
>>>
>>> Java version, cocoon version, tomcat version, OS, etc?
>>>
>>> Best Regards,
>>>
>>> Antonio Gallardo.
>>>
>>> Stephen Winnall escribió:
>>>> I'm trying to deploy my Cocoon application in Tomcat and am  
>>>> getting the following error:
>>>>
>>>>     java.lang.OutOfMemoryError: PermGen space
>>>>
>>>> Wisdom on the net has it that this happens as a result of large  
>>>> memory leaks: if classes used in a servlet are referenced from  
>>>> outside the servlet, the garbage collector cannot recycle them  
>>>> when the application is undeployed; redeploying the application  
>>>> results in the classes being loaded a further time, and so on  
>>>> until memory runs out. I have looked in the Cocoon mailing lists  
>>>> for other occurrences of this problem, but I've found nothing,  
>>>> so I assume the problem is in one of the classes I wrote to  
>>>> extend my application.
>>>>
>>>> Does anyone have experience with tracking down this sort of  
>>>> problem in Cocoon apps?
>>>>
>>>> Steve
>>>>
>>>>
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>
>
>
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