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From Endre StĂžlsvik <>
Subject Memory leaking: WebappClassLoader isn't GC'ed
Date Wed, 25 Jan 2006 02:03:05 GMT

I have a memory-leak.

That is, I can't start my full application and have unload-capability. If 
I "comment out" (by adding 'if (false) { ... }') large chuncks of the 
system, I manage to get it up, _and_ get it down again!

Currently, pretty much the whole application have to be commented out to 
enable webapp unloading to actually let the system be GC'ed. Both if I 
comment in the starting of WebMacro, or the "subsystem" that parses the 
system XML configuration (which uses on jdom), I can't unload.

The problem seems to be that I get a large cluster with somehow-reacable 
objects forming - all having the not-GC'ed WebappClassLoader somewhere in 

Is there any documentation out there that can give me a definitive clue? 
I've used VERY MUCH time on this problem now, and searched high and low 
for answers. I've used JProfiler and YourKit to my limit too, and still 
can't seem to get an understanding: Using the "find GC roots", I sometimes 
get an _elaborate_ diagram including lots of tomcat and sun mbean-stuff 
that I don't know (!), but often there is just an _annoying_ "other gc 
root" or "Other GC".

Any help appreciated.


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