使用@ManyToOne和@JoinColumn保存模型时出现Hibernate异常

Question

当我调用hibernate save时，我会面临这个异常，我不知道如何解决这个问题。在我的例子中，我将join列从PrimaryKey更改为另一列，因此我面临这个异常。我不想保存客户与承销商和我只想保存外键。

org.hibernate.TransientPropertyValueException: object references an unsaved transient instance - save the transient instance before flushing

我的域模型是：

@Entity
@Table(name = "CORE_UNDERWRITER2")
@Getter
@Setter
@NoArgsConstructor
@AllArgsConstructor
public class UnderWriter  {

    @Id
    @GeneratedValue(generator = "uuid2")
    @GenericGenerator(name = "uuid2", strategy = "uuid2")
    private String id;

    @ManyToOne(fetch = FetchType.LAZY)
    @JoinColumn(name = "CUSTOMER_BANK_API_ID", referencedColumnName = "BANK_API_ID")
    private Customer customer;

    .....
}
@Entity
@Table(name = "CORE_CUSTOMER")
@Getter
@Setter
@NoArgsConstructor
@AllArgsConstructor
public class Customer {

    @Id
    @GeneratedValue(generator = "uuid2")
    @GenericGenerator(name = "uuid2", strategy = "uuid2")
    private String id;

    @Column(name = "BANK_API_ID", nullable = false)
    private String bankApiId;

    ....
}

Answer 1

您可以尝试以下操作：

@ManyToOne(cascade = CascadeType.ALL)
@JoinColumn(name = "CUSTOMER_BANK_API_ID", referencedColumnName = "BANK_API_ID")
private Customer customer;

但这取决于您的应用程序需要什么。我建议进一步了解实体状态。