The jboss-service.xml only provides a login module for authenticating users against the jBPM identity tables. The .sar does not (yet) expose any MBean, but contains the jBPM libraries and configuration files. These libraries are placed in a unified class loader and available to any webapp or ejb-jar; this is why your app works. If you wanted class isolation you'd have to delete the libraries from the .sar and put them inside each .war. View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4238637#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...