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.
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). Bill On Tue, Apr 24, 2012 at 5:41 PM, Chris Pratt <thechrispr...@gmail.com>wrote: > Well, yes and no. As I understand the problem, it really got bad around > the Java 5 timeframe because of the addition of Enumerations to the > language. What Resin does (and all auto-reloading Java containers do) is > to create a ClassLoader that contains all the code for your application. > When it senses a change to your code, it loads that new code into a brand > new ClassLoader and releases the old one to be garbage collected once it's > done processing it's active requests. The problem is that, since > Enumerations are guaranteed to work with the == operator, even when > serialized/deserialized between different computers, Java treats them > special, by keeping them in the Permanent Generation (so their internal > ID's won't change). Unfortunately, each time the app is loaded a new set > of Enumerations takes up more space in the precious PermGen until it > finally blows its lid. So, theoretically, you could use less PermGen by > limiting Enumeration use, but that's really not a realistic response. > Before Java became property of Oracle, there was some talk about fixing > this problem at the JVM level, but I haven't heard anything in quite a > while. > (*Chris*) > > > On Tue, Apr 24, 2012 at 1:54 PM, Rick Mann <rm...@latencyzero.com> wrote: > >> 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 >> >> >> _______________________________________________ >> 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 > >
_______________________________________________ resin-interest mailing list resin-interest@caucho.com http://maillist.caucho.com/mailman/listinfo/resin-interest
