java.lang.IllegalArgumentException：无法找到持久性

Question

I am working on a project migrated from WLS8 to WildFly 10. Hibernate 3.3 (implementation of JPA) was used in WLS8. However, WildFly 10 doesn't support this version so I use the default Hibernate (version 5) bundled with WildFly 10.

But I got run time error:

ERROR [stderr] (default task-32) java.lang.IllegalArgumentException: Unable to locate persister: com.x.switch.entity.LOC

Here is the file/class structure in .war :

--WEB-INF
--classes
--com
--META-INF
--persistence.xml
--lib
--web.xml
--jboss-web.xml

I couldn't figure out why the entity is not found (as it is under classes and packaged in war file).

Answer 1

Ironically after I list all Entities in persistence.xml, the error is gone. It's fixed but I still don't understand why I need to do so since every Entity is annotated.