使用一个实体（及其主键）作为另一个实体的ID

You can create a composite id class that only have the ContentHeader:@Embeddablepublic class ContentKey implements java.io.Serializable {    @ManyToOne(cascade = {}, fetch = FetchType.LAZY)    @JoinColumn(name = "ID", updatable = true)    private ContentHeader header;    // ...}@Entity@Inheritance(strategy=InheritanceType.TABLE_PER_CLASS)public abstract class Content {    @Id    public ContentKey  getContentKeyId()    // ...}

这应该够了吧。