How to create an entity with a table with two foreign key columns using Hibernate: No identifier specified for entity:

I am trying to create a table in a database that requires two foreign key columns. But I have an exception and I don't know how to fix this error:

Could you please help me?

exception:

No identifier specified for entity: com.xxx.client.db.domain.app.PhoneComp

follow my solid class

PhoneComp.class

/**
 *
 * @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*/
}

mobile phone

/**
 *
 * @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 **/

}