java - 为什么我的 EmbeddedId 在 hibernate 中不起作用？

Question

我在表 HolidayPackageVariant 中有一个复合主键 (IDHOLIDAYPACKAGE, IDHOLIDAYPACKAGEVARIANT)，其中 IDHOLIDAYPACKAGE 指的是实体 HolidayPackage HolidayPackageVariant 和 HolidayPackage 之间存在 Many 到 One 关系。

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

Initial SessionFactory creation failed.org.hibernate.annotations.common.AssertionFailure: Declaring class is not found in the inheritance state hierarchy: org.wah.model.holidaypackage.HolidayPackageVariantPrimaryKey

谁能告诉我我在这里做错了什么？

我的 POJO 如下所示:

HolidayPackageVariant:

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

    private HolidayPackageVariantPrimaryKey idCompound;

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

    // other code
}

HolidayPackageVariantPrimaryKey

@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
}

HolidayPackage

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
}

Answer 1

您不应该在 EmbeddedId 类中包含 @Id。删除 HolidayPackageVariantPrimaryKey 中的 Id 注释，它应该可以正常工作。