为什么我不能创建新的地址使用：

AddressEntity ad = new AddressEntity(); 
ad.setCityId(session.get(CityEntity.class, 343))

但它是这样运作的：

Query<CityEntity> query = session.createQuery("from CityEntity where id = 343", CityEntity.class);
 query.setFirstResult(0);
 query.setMaxResults(1);
 List<CityEntity> listCity = query.getResultList();
 ad.setCityId(listCity.get(0));

地址实体：

@Entity
@Table(name = "address")
@Getter
@Setter
@ToString
public class AddressEntity {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "address_id")
    private Short addressId;
    ...
    ...
    @ManyToOne
    @JoinColumn(name = "city_id")
    private CityEntity cityId;

}

城市实体：

@Entity
@Table(name = "city")
@Getter
@Setter
@ToString
public class CityEntity {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "city_id")
    private Short cityId;
    ...
    ...
    ...

}

我觉得我不知道什么有用的东西，但我不能理解它是什么
我尝试通过session.get（）和query来获取和设置id