具有组合键的Spring OneToMany关系到另一个具有组合键的关系

@Entity
public class ParentEntity {
    @EmbeddedId
    private ParentEntityId id;

    // other fields and relationships

    @OneToMany(mappedBy = "parentEntity")
    private List<ChildEntity> childEntities;

    // getters and setters
}

@Embeddable
public class ParentEntityId implements Serializable {
    private Long key1;
    private Long key2;

    // constructors, getters and setters
}

@Entity
public class ChildEntity {
    @EmbeddedId
    private ChildEntityId id;

    // other fields and relationships

    @ManyToOne
    @JoinColumns({
        @JoinColumn(name = "key1", referencedColumnName = "key1"),
        @JoinColumn(name = "key2", referencedColumnName = "key2")
    })
    private ParentEntity parentEntity;

    // getters and setters
}

@Embeddable
public class ChildEntityId implements Serializable {
    private Long key1;
    private Long key2;
    private Long childKey;

    // constructors, getters and setters
}