java - 为什么在 hibernate 状态下我的EmbeddedId无法正常工作？

我在表(IDHOLIDAYPACKAGE, IDHOLIDAYPACKAGEVARIANT)中有一个复合主键HolidayPackageVariant，其中IDHOLIDAYPACKAGE引用的实体HolidayPackage具有。许多至:HolidayPackageVariant和HolidayPackage之间的一种关系。

当我尝试在HolidayPackageVariant中进行复杂的PK映射时，出现以下错误:



有人可以告诉我我在做什么错吗？

我的POJO看起来像这样:

@Entity
@Table(name="HOLIDAYPACKAGEVARIANT")
public final class HolidayPackageVariant {

    private HolidayPackageVariantPrimaryKey idCompound;

    @EmbeddedId
    public HolidayPackageVariantPrimaryKey getIdCompound() {
        return idCompound;
    }

    // other code
}

@Embeddable
public final class HolidayPackageVariantPrimaryKey implements Serializable {

    private Integer idHolidayPackageVariant;
    private HolidayPackage holidayPackage;

    public HolidayPackageVariantPrimaryKey(){}

    public HolidayPackageVariantPrimaryKey(int id, HolidayPackage pkg){
        setIdHolidayPackageVariant(id);
        setHolidayPackage(pkg);
    }

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "IDHOLIDAYPACKAGEVARIANT", nullable = false)
    public Integer getIdHolidayPackageVariant() {
        return idHolidayPackageVariant;
    }

    @Id
    @ManyToOne(fetch=FetchType.LAZY, cascade={CascadeType.ALL})
    @JoinColumn(name="IDHOLIDAYPACKAGE", nullable=false)
    public HolidayPackage getHolidayPackage() {
        return holidayPackage;
    }

    // equals and hashCode
}

public final class HolidayPackage {
    private Set<HolidayPackageVariant> holidayPackageVariants = new HashSet<HolidayPackageVariant>(0);

    @OneToMany(fetch=FetchType.LAZY, cascade={CascadeType.ALL}, mappedBy = "idCompound.holidayPackage")
    public Set<HolidayPackageVariant> getHolidayPackageVariants() {
        return holidayPackageVariants;
    }

    // other code
}

最佳答案

您不应在@Id类中包含EmbeddedId。删除您的Id中的HolidayPackageVariantPrimaryKey批注，它应该可以正常工作。