@Entity
@Table(name="ORDER")
public class Order{

     @Id
     @GeneratedValue(generator = "hibernate-uuid")
     @org.hibernate.annotations.GenericGenerator(
          name = "hibernate-uuid",
          strategy = "uuid"
     )
     @Column(name="ID")
     private String id;


     @Id
     @GeneratedValue(strategy = GenerationType.SEQUENCE, generator="ref_num_seq")
     @SequenceGenerator(name="ref_num_seq", sequenceName="SEQ_ORDER_REF_NUM")
     @Column(name="REF_NUM")
     private Long refNum;


     public Long getId() {
          return id;
     }

     public void setId(Long id) {
          this.id = id;
     }

     public Long getRefNum() {
          return refNum;
     }

     public void setRefNum(Long refNum) {
          this.refNum = refNum
     }
}