Due to JBAS-3013 we changed SecurityActions to use MBeanProxyExt.create what is creating a fake ClassLoader on every call what is forcing Proxy.newInstance to create a new proxy. (Since ClassLoader is a key parameter to a proxy creation).
This causes excessive GC, memory leaks in production and server outage when using EJB (2.0) or anything related to org.jboss.ejb.Container