"flavia.rainone" wrote : If you want to do load-time with jrockit, you just can't do that in the jdk1.4 manner. | You need to use the native classloader hooks of jrockit. | | http://labs.jboss.com/portal/jbossaop/docs/1.5.0.GA/docs/aspect-framework... | | But, since you installed JRockit 1.5, you can also go for the load time instrumentations in the jdk1.5 manner. First, thank you for posting an your message. When I posted the first message about this problem I've configured AOP load-time in JDK1.5 plain manner, and I get the specified exception stack trace. I've also tried with the jrockit specific jrockit-pluggable-instrumentor.jar from lib-50 (and modification about MBean code to use AspectManagerService rather than AspectManagerServiceJDK5). I'd like to precise that when I use load-time for a standalone Java app I've no problem, It's only with JBossAS that I get the error. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3993847#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...