OK, so what you want to know is what command could you run or API could you call that will identify that EAP 4.3.0 was build from an AS 4.2.1 base? The answer is: none. Why? Because even thought it started from 4.2.1, all of the changes made to it to make it part of EAP 4.3.0 make it no longer 4.2.1. Every AS-specific manifest, and even the jboss.system:type=Server mbean report that the AS version is 4.3.0. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4166005#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...