Here's why it won't work: http://anonsvn.jboss.org/repos/jbossas/tags/JBOSS_AOP_1_3_6/aspects/src/m... is referring to a method clearBlackList() but it's actually clearBlacklist() on UnifiedClassLoader. Notice the case difference of the second 'L'. Yet strangely, I find that via the ViewVC method of accessing the source, on the 1.3 branch, I see that bug was fixed in this version: http://viewvc.jboss.org/cgi-bin/viewvc.cgi/jbossas/branches/Branch_AOP_1_... What version does that correspond to? 1.3.>6? View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4134412#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...