:37
To: Tomcat Users List
Subject: Re: Memory leaks on webapp redeploy
On 11/28/06, Mike Quilleash [EMAIL PROTECTED] wrote:
As a brief aside I found the following code in the
WebAppClassLoader.releaseResources() of Tomcat 6, so it looks like
some of the well-known caches are being cleared out
Is anyone running into issues with memory leaks occuring
whenever a webapp is redeployed? I've been having a lot of
problems with this. I think what's exacerbating the problem
is that I'm using Hibernate and JAX-WS which I have bundled
with my application which use a lot of memory.
Yes,
and that any review, disclosure, dissemination,
distribution or copying of it or its
contents
- Original Message -
From: Mark Thomas [EMAIL PROTECTED]
To: Tomcat Users List users@tomcat.apache.org
Sent: Monday, November 27, 2006 8:37 PM
Subject: Re: Memory leaks on webapp redeploy
Jon
[EMAIL PROTECTED] wrote:
The problems seems to be located with Cglib classloaders referencing policy.
There is a lot of topic on the Net, which may be interessing to read, but noone
seems to have found a valuable solution. (Increasing the PermGenspace is NOT a
reasonable solution)
That
The problems seems to be located with Cglib classloaders
referencing
policy. There is a lot of topic on the Net, which may be
interessing
to read, but noone seems to have found a valuable solution.
(Increasing the PermGenspace is NOT a reasonable solution)
That means, that
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Jon,
Jon Miller wrote:
Is anyone running into issues with memory leaks occuring whenever a
webapp is redeployed?
This is probably not Tomcat's fault it's Java's fault.
When Tomcat reloads a webapp, it discards the ClassLoader (or
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Remy,
[EMAIL PROTECTED] wrote:
That means, that hibernate apps will always generate OOM...
Not always. But some hibernate/cglib/tomcat uses seems to generate
classloader memory leak:
From: Christopher Schultz [mailto:[EMAIL PROTECTED]
Subject: Re: Memory leaks on webapp redeploy
Last time I checked, Class objects basically never get GC'd,
so any static data stays around forever. You have to shut
down the VM in order to free that memory.
Not true - classes do get
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Chuck,
Caldarale, Charles R wrote:
From: Christopher Schultz [mailto:[EMAIL PROTECTED]
Subject: Re: Memory leaks on webapp redeploy
Last time I checked, Class objects basically never get GC'd,
so any static data stays around forever. You have
From: Christopher Schultz [mailto:[EMAIL PROTECTED]
Subject: Re: Memory leaks on webapp redeploy
This wasn't the case some time ago. A cleanly written webapp would
double the number of Class objects kept around after a re-deploy
(actually, after an automatic re-deploy, but that shouldn't
It's been a while since I profiled any of my apps, but that
used to be the case... after a few days in development of
auto-re-loading the webapps, we'd get an OOM. We could watch
the heap fill up with useless Class objects (for instance,
my.package.Class showed up 10 times after 9
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Chuck,
Caldarale, Charles R wrote:
Subject: Re: Memory leaks on webapp redeploy
The only thing I can think of is perhaps Java is keeping introspection
information around and never releasing it.
Quite possible. There's a good discussion
From: Christopher Schultz [mailto:[EMAIL PROTECTED]
Subject: Re: Memory leaks on webapp redeploy
Maybe this issue has been fixed in recent VMs (IIRC, older
VMs -- maybe 1.3-era -- would never discard java.lang.Class
objects.
Not true either. I've been porting Sun's JVMs to various
http://wiki.apache.org/tomcat/OutOfMemory : Another link which deals
about OOM and singleton.
Have you ever tried to do some inspections with decent profiler
(OptimiseIt, Jprofiler, Yourkit, ...) ?
RC
---
: Memory leaks on webapp redeploy
Jon Miller wrote:
Hi all,
Is anyone running into issues with memory leaks occuring whenever a
webapp is redeployed?
Tomcat version? There have been issues with older releases.
I think I read in a FAQ that even using a singleton in your app will
cause memory
-
From: anjan bacchu [EMAIL PROTECTED]
To: Tomcat Users List users@tomcat.apache.org
Sent: Monday, November 27, 2006 8:08 PM
Subject: Re: Memory leaks on webapp redeploy
Hi Mark,
Does anyone on the tomcat dev list use Netbeans profiler at all ? OR do
you guys
exclusively use YourKit ?
Thank
Thanks for the info Remy. I've been using Sun's JVM, but, I think I'm going
to try IBM's to see if that makes a difference.
Jon
- Original Message -
From: [EMAIL PROTECTED]
To: users@tomcat.apache.org
Sent: Tuesday, November 28, 2006 3:30 AM
Subject: RE: Memory leaks on webapp
, maybe someone who's more familiar with
ClassLoading issues can make something of this.
Cheers.
-Original Message-
From: Caldarale, Charles R [mailto:[EMAIL PROTECTED]
Sent: 28 November 2006 16:43
To: Tomcat Users List
Subject: RE: Memory leaks on webapp redeploy
From: Christopher
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Jon,
Jon Miller wrote:
I'm getting ready to try NetBeans profiler right now. I tried it awhile
back before it was released, but, there was something wrong with the
Solaris library, so, I couldn't get it to work. I'm hoping I'll have
better luck
From: Mike Quilleash [mailto:[EMAIL PROTECTED]
Subject: RE: Memory leaks on webapp redeploy
Looks like during the WebappClassLoader cleanup the logging is being
reinitialised.
You may well have found the problem. Must be some context-specific
logging going on after contextDestroyed
- Original Message -
From: Christopher Schultz [EMAIL PROTECTED]
To: Tomcat Users List users@tomcat.apache.org
Sent: Tuesday, November 28, 2006 11:46 AM
Subject: Re: Memory leaks on webapp redeploy
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Jon,
Jon Miller wrote:
I'm getting
On 11/28/06, Mike Quilleash [EMAIL PROTECTED] wrote:
As a brief aside I found the following code in the
WebAppClassLoader.releaseResources() of Tomcat 6, so it looks like some
of the well-known caches are being cleared out by Tomcat itself.
Are you using 5.5 or 6.0 ? If you're using 5.5, then
Jon Miller wrote:
Hi all,
Is anyone running into issues with memory leaks occuring whenever a
webapp is redeployed?
Tomcat version? There have been issues with older releases.
I think I read in a FAQ that even using a singleton in your app will
cause memory leaks? Does anyone know if this
Hi Mark,
Does anyone on the tomcat dev list use Netbeans profiler at all ? OR do
you guys
exclusively use YourKit ?
Thank you,
BR,
~A
On 11/27/06, Mark Thomas [EMAIL PROTECTED] wrote:
Jon Miller wrote:
Hi all,
Is anyone running into issues with memory leaks occuring whenever a
webapp
On Monday 27 November 2006 19:37, Jon Miller wrote:
Is anyone running into issues with memory leaks occuring whenever a
webapp is redeployed?
Yes ... :)
I've been having a lot of problems with this. I
think what's exacerbating the problem is that I'm using Hibernate and
JAX-WS which I
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