Igor is correct, putting presentation java code in the WAR is correct. Putting business logic in the ear is correct to. Making them communicate is harder (this is where you want loose coupling...). Remember that the WAR can see classes in the EAR, but not the other way around. So, there isn't really a way around this - except designing your app nicely. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4124349#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...