@Embeddable
public class EmployeePK implements Serializable {

    private long groupId;
    @GeneratedValue(strategy = GenerationType.AUTO)
    private long batchId;

   
    public long getBatchId() {
        return batchId;
    }

    public void setBatchId(long batchId) {
        this.batchId = batchId;
    }

//implements equals and hashcode

}