Question

我有两个班级Team和User：

@Entity
@Table(name = "team")
@Cache(usage = CacheConcurrencyStrategy.NONSTRICT_READ_WRITE)
public class Team  extends AbstractAuditingEntity implements Serializable, Participant {

    private static final long serialVersionUID = 1L;

    @Id
    @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "sequenceGenerator")
    @SequenceGenerator(name = "sequenceGenerator")
    private Long id;

和

 @Entity
    @Table(name = "user")
    @Cache(usage = CacheConcurrencyStrategy.NONSTRICT_READ_WRITE)
    @org.springframework.data.elasticsearch.annotations.Document(indexName = "user")
    public class User extends AbstractAuditingEntity implements Serializable, Participant {

        private static final long serialVersionUID = 1L;

        @Id
        @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "sequenceGenerator")
        @SequenceGenerator(name = "sequenceGenerator")
        private Long id;

我想创建新的实体匹配。比赛可以有2位参与者。参与者可以是团队或用户。我想创建抽象，以便我可以添加团队或用户以匹配参与者。我想创建Interface Participant并使用@MappedSuperclass进行映射，然后使用Team和User来实现Participant，但出现错误：

org.hibernate.AnnotationException：@OneToOne或@ManyToOne Match.participantFirst引用了一个未知实体：参与者

@MappedSuperclass
public interface Participant {

}

Answer 1

有用的链接：Interfaces with hibernate annotations ＆http://docs.jboss.org/hibernate/core/3.3/reference/en/html/inheritance.html#inheritance-tableperconcrete

根据文档，使用XML映射可能会有所帮助，

If your superclass is abstract, map it with abstract="true". If it is not abstract, an additional table (it defaults to PAYMENT in the example above), is needed to hold instances of the superclass.

休眠实体抽象

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