<hibernate-configuration>
<session-factory>
  <property name="hibernate.connection.driver_class">org.h2.Driver</property>
  <property name="hibernate.connection.password">admin</property>
  <property name="hibernate.connection.url">jdbc:h2:tcp://localhost/learn</property>
  <property name="hibernate.connection.username">sa</property>
  <property name="hibernate.default_schema">learn</property>
  <property name="hibernate.dialect">org.hibernate.dialect.H2Dialect</property>
  <property name="hibernate.show_sql">true</property>
  <property name="hibernate.format_sql">true</property>
  <property name="hibernate.current_session_context_class">thread</property>
  <property name="hibernate.hbm2ddl.auto">update</property>
</session-factory>
</hibernate-configuration>


package edu.learning.orm;

import org.junit.Assert;
import org.hibernate.HibernateException;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
import org.hibernate.service.ServiceRegistry;
import org.hibernate.service.ServiceRegistryBuilder;

/**
* Hello world!
*
*/
public class HibernateUtils
{
   private static SessionFactory sFactory=buildSessionFactory();
   
   private static SessionFactory buildSessionFactory() throws HibernateException {
      Configuration configuration = new Configuration().configure();
       ServiceRegistry serviceRegistry = new     ServiceRegistryBuilder().applySettings(configuration.getProperties()).buildServiceRegistry();       
       return configuration.buildSessionFactory(serviceRegistry);
   }
   private static Session openNewSession(){
      
      return sFactory.openSession();
   }
   private static Session openCurrentSession(){
      return sFactory.getCurrentSession();
   }
   
    public static void main( String[] args )
    {
        Session session1 = HibernateUtils.openNewSession();
        Session session2 = HibernateUtils.openNewSession();
        Session session3 = HibernateUtils.openCurrentSession();
        Assert.assertNotNull("Session should NOT null",session1);
        Assert.assertNotNull("Session should NOT null",session2);
        Assert.assertNotNull("Session should NOT null",session3);
        Assert.assertNotEquals("Both sessions should NOT be different", session1, session2);
        Assert.assertNotEquals("Both sessions should NOT be different", session2, session3);
        Assert.assertEquals("Both sessions should be different", session1, session3);
        Assert.assertEquals("Both sessions should be different", session2, session3);
    }
}