Hi Im getting

javax.resource.ResourceException: Transaction is not active

when this code executes. (em = EntityManager)

public getUserGoupById(Long id) {
 Query dbQuery = em.createQuery("from UserGroup where id = :id");
 dbQuery.setParameter("id", id);
 UserGroup ug = (UserGroup) dbQuery.getSingleResult();
 return ug //Here the exception will be thrown.
}

In debugmode Im able to see that ug is what Im looking for (right Id & name). But every time I trie to return it the exception will show. I use the same bean for getUserById(Long id), and it works fine. What could be wrong in the usergroup-case?

Thanks!