I have committed my changes to AOP against https://jira.jboss.org/jira/browse/JBAOP-788. I've tested the jars and the new aop.xml in AS 5.1.0 and it seems to work well. Tomorrow I will make sure the install script works for AS 5.1 (so far I have been updating the jars and aop.xml manually) and AS 4.2.3, and run the aop testsuites for both before closing the issue and releasing AOP 2.2.1.