javassist, cglib  and Hibernate could be such a candidates. 
It does not help to have it in WEB-INF/lib.

See  
http://my.opera.com/karmazilla/blog/2007/03/15/permgen-strikes-back
http://stackoverflow.com/questions/2051734/why-is-permgen-space-growing
http://stackoverflow.com/questions/1124131/what-can-be-done-with-permgen-out-of-space-exception-in-tomcat-spring-hibernat


Am 25.07.2013 um 17:27 schrieb Trenton D. Adams <[email protected]>:
> 
> 
> If everything you use is in WEB-INF/lib, this can't happen because all the 
> classes would get unloaded, static or otherwise.  But, when they are shared, 
> such as in tomcat/lib, it can become a problem.
> 


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