Exceptions in the form of `java.lang.IllegalArgumentException: Not an entity:` (e.g. for entities which are not listed in `persistence.xml` or `@Basic` type which are annotated with an entity relationship) should contain information where the errornous property/specification was found, e.g. `java.lang.IllegalArgumentException: Not an entity: interface java.util.List (encountered in a.b.c.Entity.property)`.