如何使用泛型参数覆盖EJB 3会话bean方法 - 如果可能的话？

public interface GenericDao<T> {
    T findById(Long id);
    void save(T entity);
    void update(T entity);
    void delete(T entity);
}

@Stateless
public class GenericDaoImpl<T> implements GenericDao<T> {
    @PersistenceContext(unitName = "my-pu")
    private EntityManager entityManager;

    @Override
    public T findById(Long id) {
        return entityManager.find(getEntityClass(), id);
    }

    @Override
    public void save(T entity) {
        entityManager.persist(entity);
    }

    @Override
    public void update(T entity) {
        entityManager.merge(entity);
    }

    @Override
    public void delete(T entity) {
        entityManager.remove(entity);
    }

    private Class<T> getEntityClass() {
        Type type = getClass().getGenericSuperclass();
        ParameterizedType paramType = (ParameterizedType) type;
        return (Class<T>) paramType.getActualTypeArguments()[0];
    }
}

@Stateless
public class MyService {
    @EJB
    private GenericDao<MyEntity> myEntityDao;

    public MyEntity findById(Long id) {
        return myEntityDao.findById(id);
    }

    public void save(MyEntity entity) {
        myEntityDao.save(entity);
    }

    public void update(MyEntity entity) {
        myEntityDao.update(entity);
    }

    public void delete(MyEntity entity) {
        myEntityDao.delete(entity);
    }
}