On 04/25/2012 08:47 PM, Matt White wrote: > On 4/24/2012 5:13 PM, Bill Au wrote: > > Wow, something I'm actually qualified to talk about on this list! :) > > >> Out of PermGen space is almost always caused by a classloader leak which >> occurs when a webapp is reloaded. It could be caused by either your own >> code, third-party code, or in some case Java core classes. > I debug PermGen errors quite a bit. Some of our apps have a cache of > dynamically generated classes (Drools does this) that, if held onto long > enough, will make the the JVM run out of PermGen. This isn't really a > mistake, it's just how it works, sadly. > > >> You need to take heap dumps before and after webapp reload and use a >> heap analyzer to see what is holding onto the leaked classloader(s). > That's how I debug them. Take a series of heap dumps and start comparing > the differences between them -- YourKit even makes this easy for you > with a tool that diffs heap dumps.
If you're using Resin 4.0, have you tried looking for the ZombieClassLoaderMarker? It's designed to make that tracing easier. -- Scott > > - Matt > > _______________________________________________ > resin-interest mailing list > resin-interest@caucho.com > http://maillist.caucho.com/mailman/listinfo/resin-interest > _______________________________________________ resin-interest mailing list resin-interest@caucho.com http://maillist.caucho.com/mailman/listinfo/resin-interest
