For readers founding this post and have the same problem: My colleague used a lot of things that are not defined in the JPA specification. After I used another development tool (IBM Rational Application Developer), I removed them and the problems are gone.
best regards Stephan -- View this message in context: http://n2.nabble.com/java.lang.ClassCastException%3A-org.apache.openjpa.util.Id-incompatible-with-org.apache.openjpa.util.LongId-tp1126788p1336729.html Sent from the OpenJPA Users mailing list archive at Nabble.com.
