/**----------------------------------------parent object ----------------------------------------------------------------------------**/
@Entity
@Table(name = "FRAUD")
public class Fraud {

    @Id
    @Column(name = "FRAUD_ID")
    @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "FRAUD_SEQ")
    @SequenceGenerator(name = "FRAUD_SEQ", sequenceName = "FRAUD_SEQ")
    private Long id;

    @OneToMany(cascade = CascadeType.ALL, mappedBy = "id")
    private List<FraudVersion> versions = new ArrayList<FraudVersion>();


    public void addVersions(FraudVersion version) {
        if (version.getId() != this) {
            this.versions.add(version);
            version.setId(this);
        }
    }
     // get set hashCode equals ......
}

/**-----------------------------------------child object------------------------------------------------------------------------------**/

@Entity
@Table(name = "FRAUD_VERSION")
@IdClass(FraudVersionPK.class)
public class FraudVersion implements Serializable {

    @Id
    private Long version;

    @Id
    @ManyToOne
    @JoinColumn(name = "FRAUD_ID")
    private Fraud id;
    // get set hasCode equals
}

/**---------------------------------------------------- PK object -------------------------------------------------------------------**/
public class FraudVersionPK implements Serializable {

    @Column(name = "FRAUD_ID")
    private Long id;

    @Column(name = "FRAUD_VERSION")
    @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "FRAUD_VERSION_SEQ")
    @SequenceGenerator(name = "FRAUD_VERSION_SEQ", sequenceName = "FRAUD_VERSION_SEQ")
    private Long version;
    //get set hasCode equals
}
/**-----------------------------------------------------------------------------------------------------------------------------------**/

           
Fraud fraud = new Fraud();
FraudVersion version = new FraudVersion();
fraud.addVersions(version);
service.save(fraud);