I'm now able to fully deploy Seam Booking example, and the difference in performance is obvious. :-) But the AnnotationMetaDataDeployer doesn't pick up all the classes as it does with the temp-copy nested jar handling. So I guess there can be other issues as well. Need to flesh them out, as well as introduce some sort of caching. For the no-copy to fully deploy Seam example, I also had to introduce structure into NestedJarFromStream. You can now force the VFS to handle with no-copy by providing system property -Djboss.vfs.forceNoCopy=true. The problems with serialization still remains. I also have to impl some more tests. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4115749#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...