In my experience, this error cannot occur unless your classes have already been woven with a really old version of AOP (as in the IDE) and deployed in jboss with a different version. Two things to try to check if this is happening 1) Run with EnableLoadtimeWeaving=false. If you still get the same error, your classes have been woven. 2) Go to the root directory of where your compiled classes are/where they are put into the .war and execute: $javap org.acme.Foo (substituting org.acme.Foo with the name of one of your woven classes that you want to check). If the class implements the Advised interface it has already been woven. I am not familiar with the AOP IDE and AOP Builder, but here's a thought you might have the AOPC'ed classes hanging around in your project's output folder, with no rebuild having been done after removing the AOP Builder. Do a Project/Clean in Eclipse and see if that helps. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4049724#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...