XMLBeans - QName thread cache, cause memory leaks

XMLBeans class uses thread local variables to store cache of QName objects (QNameCache instance).

In application-server environments where threads are pooled, this causes situation that application using xml-beans library when undeployed is not garbage-collected, because its classloader is reachable from thread local variable.

Possible solution would be to use memory-sensitive techniques using weak or soft references.