Ok new error when doing seam gen from prompt I tried to generate entities!
And got this error:
15:56:16,466 WARN [ServiceController] Problem starting service persistence.units:ear=helloworld.ear,unitName=helloworld javax.persistence.PersistenceException: org.hibernate.HibernateException: Wrong column type: MESSAGEBLOB, expected: varbinary(255) at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:720)