I don't quite get the concept of scope classloaders yet. Wouldn't you want both ear's to use the same classloader so you don't get the classCastException? Here are the jboss-app.xml files. NexusEvents.ear: <jboss-app> | <loader-repository> | seam.jboss.org:loader=NexusEvents | </loader-repository> | | </jboss-app> And the KeyB.ear: <jboss-app> | <loader-repository> | seam.jboss.org:loader=KeyBankChecksJEE2 | </loader-repository> | </jboss-app> Originally I tried to set both loaders equal to NexusEvents (identical- seam.jboss.org:loader=NexusEvents in each config file) but this caused the KeyB.ear deployment to fail. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4163936#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...