java - 如何使用Hibernate创建实体来创建具有两个外键列的表: No identifier specified for entity:

Question

我正在尝试在数据库中创建一个需要有两个外键列的表。但我有一个异常(exception)，我不知道如何解决这个错误:

你能帮我一下吗？

异常(exception):

没有为实体指定标识符:com.xxx.client.db.domain.app.PhoneComp

关注我的实体类

PhoneComp.类

/**
 *
 * @author joh
 */
@Entity
@Table(name = "phoneComp")
public class PhoneComp implements Serializable {

   private static final long serialVersionUID = 1L;

   @Id
   @GeneratedValue(strategy = GenerationType.IDENTITY)
   @Basic(optional = false)
   @Column(name = "id")
   private Integer id;

   @JoinColumn(name = "cellPhoneRef", referencedColumnName = "id")
   @ManyToOne
   private Cellphone cellPhoneReference;

   @JoinColumn(name = "cellPhoneComp", referencedColumnName = "id")
   @ManyToOne
   private Cellphone cellPhoneComp;

   public PhoneComp() {}

   /**get and sets*/
}

CellPhone.class

/**
 *
 * @author joh
 */
@Entity
@Table(name = "cellphone")
public class Cellphone implements Serializable {

    private static final long serialVersionUID = 1L;

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Basic(optional = false)
    @Column(name = "id")
    private Integer id;

    @Column(name = "cellphoneName")
    private String cellphoneName;

    @Basic(optional = false)
    @Column(name = "isActive")
    private boolean isActive;

    @Column(name = "cellphoneBrand")
    private String cellphoneBrand;

    @Column(name = "lastModifiedDate")
    private Date lastModifiedDate;

    public Cellphone() {}

    /**get and sets **/

}

Answer 1

您的实体PhoneComp需要有一个由@Id注释的主键。