@MappedSuperclass
public class BaseEntity implements Serializable{

	@Id
	private Long id;
	@Version
	private long version;

	public BaseEntity() {
		try {
			Thread.sleep(2);
			this.id = System.currentTimeMillis();
		} catch (InterruptedException e) {
			e.printStackTrace();
		}
	}

@Entity
public class Junico extends BaseEntity{

     public Junico(){
          super();
     }
}