Hi Rick.
After having had these issues for years, I started blogging about it and
how to find classloader leaks [1]. I also compiled a list of API calls
and third party libraries known to trigger these leaks [2], and as you
can see, it is quite common both to cause these problems yourself and to
have them caused by some dependency.
Having done the research, I ended up creating a small library that you
can add to you web application, that will clean up strong references
keeping your classloader from being garbage collected [3]. Somewhat like
Tomcat has built in, but taking care of more of the known problems. I
suggest you add this library to you app and watch the logs (feel free to
report your findings).
Having said that, I should admit that I'm still seeing PermGen crashes
running under Resin, even when there are no visible strong references to
my classloader. I have not had time to investigate whether this is
caused by Resin (such as the HotSwap capability), or if it is some JVM
bug (and possibly something with IntelliJ, as the problem increases
using the IntelliJ Resin plugin). I should probably try turning HotSwap
off, or try another application server - or another JVM. Someday...
Good luck!
</Mattias>
1:
http://java.jiderhamn.se/2011/12/11/classloader-leaks-i-how-to-find-classloader-leaks-with-eclipse-memory-analyser-mat/
2:
http://java.jiderhamn.se/2012/02/26/classloader-leaks-v-common-mistakes-and-known-offenders/
3:
http://java.jiderhamn.se/2012/03/04/classloader-leaks-vi-this-means-war-leak-prevention-library/
----- Original Message -----
Subject: [Resin-interest] Out of PermGen space
Date: Tue, 24 Apr 2012 13:54:40 -0700
From: Rick Mann <rm...@latencyzero.com>
When I'm making changes to the code of a webapp, Resin kindly reloads it
for me. I can usually get a handful of reloads in before Resin complains
about being out of PermGen space.
Is there something I'm doing wrong in my app that it leaks like this?
--
Rick
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</Mattias>
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