具有两个相同类型字段的JPA实体

Question

我试图在我的实体中有两个相同域类的字段，但我得到了这个错误：

org.hibernate.mappingException：无法确定表：Outhories中：com.packt.webapp.domain.user的类型，列:[org.hibernate.mapping.column（author）]

@Entity
@Table(name="opinions")
public class Opinion {

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private long id;
    @NotNull
    private String text;
    @NotNull
    private String date;
    @ManyToOne
    @JoinColumn(name="commented_user")
    private User writtenTo;
    private User author;

@Entity
@Table(name="user")
public class User {

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private long id;
    private String username;
    private String password;
    @OneToMany(mappedBy="writtenTo")
    private List<Opinion> opinions;

我只想将意见映射到已评论的用户，并将评论的作者存储在author字段中。当我移除author字段时，一切正常。这个例子有什么问题？

Answer 1

尝试注释也作者？

@ManyToOne
@JoinColumn(name="author")
private User author;