Dinesh on Java

Lets see in the following example how to an object moves from detached state to the persistent state again.
HibernateTestDemo.java

package com.sdnext.hibernate.tutorial;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.AnnotationConfiguration;

import com.sdnext.hibernate.tutorial.dto.UserDetails;

public class HibernateTestDemo {

 /**
  * @param args
  */
 public static void main(String[] args) 
 {
  UserDetails userDetails = new UserDetails();
  //Here 'userDetails' is in TRANSIENT state
  
  SessionFactory sessionFactory = new AnnotationConfiguration().configure().buildSessionFactory();
  Session session = sessionFactory.openSession();
  session.beginTransaction();
  
  userDetails = (UserDetails) session.get(UserDetails.class, 1);
  //Here 'userDetails' is in PERSISTENT state
  
  session.save(userDetails);
  session.getTransaction().commit();
  session.close();
  
  session = sessionFactory.openSession();
  session.beginTransaction();
  
  userDetails.setUserName("User Updated after session close");
  //Here 'userDetails' is in DETACHED state
  
  session.update(userDetails);
  //Here 'userDetails' is again in PERSISTENT state
  session.getTransaction().commit();
  session.close();
 }
}