"waynebaylor" wrote : 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). Actually, that is not possible since the value of the unitName annotation gets put into the bytecode. Out of curiosity I tried what you suggested, but it does not compile View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4049889#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...