Hibernate One to Many update Operation

// FOR TABLE and  POJO  see the One to Many Insert Operation : Here
import java.util.Set;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.Configuration;
public class HibernateEngine_Update {

public static void main(String[] javaWorld)
{

System.out.println(" ....... ENGINE START ............");
System.out.println(" .. ONE TO MANY ANNOTATION UPDATE LESSON ..");
Configuration configurationObj = new Configuration();
configurationObj.configure("hibernate.cfg.xml");
SessionFactory sessionFactoryObj = configurationObj.buildSessionFactory();
Session sessionObj = sessionFactoryObj.openSession();

Parent parentObj= (Parent) sessionObj.get(Parent.class, new Integer(101));
parentObj.setName("Sunny");
Set<Children> childrenSet=parentObj.getChildren();

for(Children child:childrenSet){
child.setName("parker");
child.setAge(20);
}

parentObj.setChildren(childrenSet);
Transaction transaction=sessionObj.beginTransaction();
sessionObj.update(parentObj);
transaction.commit();

System.out.println("....... DATA UPDATED SUCCESSFULLY ..........");
sessionObj.close();
sessionFactoryObj.close();
System.out.println("....... ENGINE STOP ..........");
}

}