I have a Stateful Session Bean that i am using to persist data

@Local
public interface GeneralDao {
     

public void saveNewUser(User user, UserContact userContact)throws CunnectedDBException;
}

and the implementation is

public void saveNewUser(User user, UserContact userContact)throws CunnectedDBException {
          EntityManager em = (EntityManager) Component.getInstance("entityManager");
          em.persist(user);
          log.info("Next User Id {0}", user.getId());
          int g=10/0;
          userContact.setUser(user);
          em.persist(userContact);
          
     }

when it gets to the user it saves it in the database , and when it gets to the division , it throws an exception but the data it saved still remains in the Database. Please how can i resolve this