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From "Kito D. Mann" <km...@virtua.com>
Subject Re: [OT] OutOfMemoryError when I have plenty of heap
Date Thu, 18 Sep 2003 13:39:01 GMT
Casey,

No problem. Good luck, and let us know when you figure out what the problem 
is. I know how annoying these problems can be -- I was once at a company 
where this problem sneaked passed QA, and those were some stressful days :-).

Kito D. Mann
Author, JSF in Action
JSF FAQ: http://www.jsfcentral.com

At 03:50 PM 9/17/2003 -0400, Casey Forbes wrote:
>Hi Kito,
>
>Thank you. This is worth looking at (plus the link looks
>interesting).  I've got a lot of classes that from JSP compilation.
>I also have lots and lots of sun.reflect.GeneratedMethodAccessorXXXX
>classes (from Digester and PropertyUtils I guess) and lots of
>_xsl._ caucho_0anonymous__xsl classes from Resin's XSLT
>engine.
>
>I'm also looking at Daniel's suggestion about hitting
>the open files limit (which I can easily increase if it
>turns out to be the cause)
>
>Casey
>
>
>
>
>On Wed, 17 Sep 2003, Kito D. Mann said:
>
> > Casey,
> >
> > If you're using JSP, and you have a large number of pages running in a
> > single VM, you may be filling up the "permanent generation" area of the
> > VM's memory. This is a fixed amount of memory dedicated to classes,
> > methods, and so on (reflective data). Since JSPs are compiled into classes,
> > it's actually possible to fill up this area of memory and consequently get
> > an OutOfMemoryError. You can, of course, increase the size -- see
> > http://java.sun.com/docs/hotspot/gc1.4.2/ for details.
> >
> > How many JSPs does At 08:21 AM 9/17/2003 -0400, you wrote:
> > >Hi everyone,
> > >
> > >There are many smart people on this list and I haven't been
> > >able to get anywhere with this problem, so...
> > >
> > >I'm running 12 Struts-based apps under Resin 2 on a Linux box.
> > >(I don't believe that this is a Struts problem - this is
> > >just some background for you)
> > >
> > >Every few days (sometimes this will happen after 2 days, sometimes
> > >5 or 6) I get an OutOfMemory error which stops the JVM...
> > >I have plenty of room in the heap (the machine has 1 GB or
> > >RAM and I have the max heap size -Xmx set to 896 MB) Just before
> > >it dies there are a few attempts to free more memory.
> > > >From the GC log:
> > >
> > >Full GC 227765K->132728K(274140K), 3.2615930 secs
> > >Full GC 132729K->132728K(274140K), 2.5218730 secs
> > >Full GC 132803K->120231K(274140K), 3.1998370 secs
> > >OutOfMemoryError
> > >
> > >As you can see - I'm only using 132 MB after the first
> > >GC which leaves plenty.... Runtime.freeMemory()
> > >etc. returns similar results..
> > >
> > >Does anybody have any ideas? I don't even know where to look
> > >next... It doesn't look like a profiler would help me here
> > >since I don't have tons of objects filling up my memory.....
> > >
> > >Thanks,
> > >Casey
> >
> > Kito D. Mann
> > Author, JSF in Action
> > JSF FAQ: http://www.jsfcentral.com
> >
> >
> >
> >
> >
>
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