And also, the same code works on two different instances on the same machine. But it is not working inside the same JBOSS instance with isolated EARs. I believe it may be JBOSS trying to be smart and optimising the call within the same instance by not doing the marshalling for the thrown application exception... isn't that make isolation/call-by-value option void? hmm.. ila View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3974727#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...