Re: JBoss-related question

Hi all,

Ok, seems this issue is resolved with the raised MaxPermSize.
Thanx so much for helping out - Guillaume and Michael especially!

I've read that the OutOufMemoryError - PermGen Space also might come from memory leaks in the actual code. But the most common cause seems to be (as already suggested in this thread) deployment without restarting the server.

In our case, I think (and hope=)) the Error occurs because of the large amount of classes used (like Guillaume suggested).

Someone asked me to supply the Java- and JBoss versions we use, so:
Java version: 1.5.0_06
JBoss version: 4.2.2.GA

Thanx again, guys!

Håkan Jacobsson - System Developer
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-----Ursprungligt meddelande-----
Från: Guillaume Cottenceau [mailto:gc(at)mnc(dot)ch]
Skickat: den 8 januari 2008 17:43
Till: Håkan Jacobsson
Kopia: Michael Goldner; pgsql-jdbc(at)postgresql(dot)org
Ämne: Re: SV: [JDBC] JBoss-related question

Håkan Jacobsson <hakan.jacobsson 'at' relevanttraffic.com> writes:

> Hi all,
>
> I tried jmap on the Jboss process id and below is the result.

[...]

> MaxPermSize = 88080384 (84.0MB)

[...]

> PS Perm Generation
> capacity = 86114304 (82.125MB)
> used = 86077472 (82.08987426757812MB)
> free = 36832 (0.035125732421875MB)
> 99.9572289407344% used
>
> -------------------------------------------------
>
> I'm not 100% on how to interpret the result - but looking at the last entry 'PS Perm Generation': 99.9%
> used, it doesn't look all that good.

It's counted compared to the currently maximum capacity, not tp
the maximum allowed capacity. You're really at 97.7% use, which
surely does not look good. You should at least increase the
MaxPermSize to 128MB, and then you should monitor that figure to
see how it behaves on your server, to make sure you don't run out
of space.

> I did restart JBoss and then I tested some stuff, before
> running jmap. So, this hasn't got to do with re-deployment
> without restarting Jboss.

It may have to do with just having a large number of classes in
your application container, as it's the case for us. It's not bad
by itself, it just needs a little more memory.

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