无法使用复合键保存实体

Question

在使用复合键时尝试保存实体时出现异常。这是我尝试保存到的异常、模型和存储库。有人可以帮忙吗？

org.springframework.beans.TypeMismatchException：转换失败 'org.CheckType_$$_jvst96c_4' 类型的属性值到所需类型 属性“checkType”的“int”；嵌套异常是 java.lang.IllegalArgumentException：无法转换类型的值 'org.CheckType_$$_jvst96c_4' 到所需的属性类型'int' 'checkType'：属性编辑器 [org.springframework.beans.propertyeditors.CustomNumberEditor] 返回 '​​org.CheckType_$$_jvst96c_4' 类型的不适当值

@Entity
public class CheckType {
    @Id
    private int id;

    @NotNull
    private String name;

    @OneToMany(mappedBy = "checkType")
    private List<ClientCheck> checks;
    //getters and setters
}

@Entity
public class Offer {
    @Id
    @Column(name = "offerid")
    private Integer offerId;
    //...
    @OneToMany(mappedBy = "offer")
    private List<ClientCheck> clientCheckList;

    //getters and setters
}

@Entity
@IdClass(ClientCheckId.class)
public class ClientCheck {
    @Id
    @ManyToOne
    @JoinColumn(name = "offer_id", referencedColumnName = "offerid")
    private Offer offer;

    @Id
    @ManyToOne
    @JoinColumn(name = "check_type_id", referencedColumnName = "id")
    private CheckType checkType;

    @Id
    private Date timestamp;

    private String result;
    //getters and setters
}

public class ClientCheckId implements Serializable {
    private int offer;
    private int checkType;
    private Date timestamp;

    //getters and setters
    //equals and hashCode
}

public interface ClientCheckRepo extends JpaRepository<ClientCheck, ClientCheckId> {
}

Answer 1

如果另一个实体是复合键的一部分，则必须在 ID 类中声明该实体，而不是其 ID：

public class ClientCheckId implements Serializable {
    private int offer;
    private CheckType checkType;
    private Date timestamp;

    //getters and setters
    //equals and hashCode
}

如果您想了解 Hibernate 的工作方式，则错误消息非常易读：org.CheckType_$$_jvst96c_4 是您的类的丰富版本，Hibernate 尝试通过反射分配给ClientCheckId 的checkType 字段，但由于类型不兼容而失败.