Enhance validation message when multiple persistence units are found -------------------------------------------------------------------- Key: WFLY-1032 URL: https://issues.jboss.org/browse/WFLY-1032 Project: WildFly Issue Type: Enhancement Components: JPA / Hibernate Reporter: Markus Dahm Assignee: Scott Marlow Priority: Minor Fix For: 8.0.0.Alpha2 The current message is Caused by: java.lang.IllegalArgumentException: JBAS011470: Persistence unitName was not specified and there are 9 persistence unit definitions in application deployment "test.ear". Either change the application to have only one persistence unit definition or specify the unitName for each reference to a persistence unit. Yet what is always helpful in search of such validation errors is the context. In that case the offending class name would suffice, you should have this information at hands since you're scanning the classes, right? Given that information I'd have found the problem immediately.