JBoss development, A new message was posted in the thread "Help: Error [Instrumentor] AOP Instrumentor failed": http://community.jboss.org/message/524400#524400 Author : Kabir Khan Profile : http://community.jboss.org/people/kabir.khan@jboss.com Message: -------------------------------------------------------------- The classes in war/lib will be in a child classloader of the classloader that the sar and aop archive belong to hence the CNFE.   You would need to do something like   Class<?> clazz = arg[0].getClass().getClassLoader().load("name.of.Class")   In this case you seem to want to do stuff to the instance, so I suggest bundling this into a util method and calling that via reflection from your aspect. -------------------------------------------------------------- To reply to this message visit the message page: http://community.jboss.org/message/524400#524400