I was trying to retrofit an old project running on JDK 1.4, JBoss 3.2.7 with AOP and load-time weaving. I read in the forums that it is believed to work with aop v1.3.6 (I forget the reference). When I tried this, I got an error that the UnifiedClassLoader doesn't have a clearBlacklist method (or maybe it was clearBlackList -- notice the case of the 'L'). Observing CVS commits indicates the case of the method was changed at some point but I don't know what release version it affects. In any case, I just want to post this so that others know. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4125363#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...