You can use a String variable as long as it's labeled final. For Example: | public class MyClass | { | private final String persistence_unit_name = MyNameFinder.getName(); | | @PersistenceContext(unitName=persistence_unit_name) | EntityManager em; | | ... | } | Where MyNameFinder.getName() is a static method that retreives the name from a file (or however you want to do it). View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4049850#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...