While looking at something else, this occurred to me. In the updated version of the classloading spi the creation of the in memory vfs url is now in a deployer so it can be customised http://viewvc.jboss.org/cgi-bin/viewvc.cgi/jbossas/projects/jboss-deploye... But it adds the virtual file to the end of the classpath. I think this should really be at the beginning of the classpath otherwise it is going to see the unweaved classes before the weaved classes? Also I don't understand why the deployers are passing you the root url and then you have to add "classes" onto it. Surely it should just be a case that the "classes" url is what gets passed to you? You don't care that the classes go in a directory called classes, it could be called something else? View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4138803#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...