public class CopyOfFirstExample
  {
  public static void main(String[] args)
    {
    Session session = null;

    try
      {
      SessionFactory sessionFactory = new Configuration().configure().buildSessionFactory();
      session =sessionFactory.openSession();
      System.out.println("Inserting Record");
      Contact contact = new Contact();
      contact.setId(6);
      contact.setFirstName("Deepak");
      contact.setLastName("Kumar");
      contact.setEmail("deepak_38@yahoo.com");
      System.out.println("ID: " + contact.getId()
        + "\nFirst name: " + contact.getFirstName()
        + "\nLast name: " + contact.getLastName()
        + "\nEmail: " + contact.getEmail());
      session.save(contact);
      System.out.println("Done");
      }
    catch(Exception e)
      {
      System.out.println(e.getMessage());
      System.exit(1);
      }
    session.flush();
    session.close();
    }
  }

public class Contact
  {
  private String firstName;
  private String lastName;
  private String email;
  private long id;

  public String getEmail()
    { return email; }

  public String getFirstName()
    { return firstName; }

  public String getLastName()
    { return lastName; }

  public void setEmail(String string)
    { email = string; }

  public void setFirstName(String string)
    { firstName = string; }

  public void setLastName(String string)
    { lastName = string; }

  public long getId()
    { return id; }

  public void setId(long l)
    { id = l; }

  }

<?xml version='1.0' encoding='utf-8'?>
<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD//EN"
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">

<hibernate-configuration>
<session-factory>
  <property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
  <property name="hibernate.connection.url">jdbc:mysql://localhost/hibernatetutorial</property>
  <property name="hibernate.connection.username">root</property>
  <property name="hibernate.connection.password">password</property>
  <property name="hibernate.connection.pool_size">10</property>
  <property name="show_sql">true</property>
  <property name="dialect">org.hibernate.dialect.MySQLDialect</property>
  <property name="hibernate.hbm2ddl.auto">update</property>
  <!-- Mapping files -->
  <mapping resource="contact.hbm.xml"/>
</session-factory>
</hibernate-configuration>

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
    "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
    "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
  <class name="Contact" table="CONTACT">
    <id name="id" type="long" column="ID" >
      <generator class="assigned"/>
    </id>
    <property name="firstName">
      <column name="FIRSTNAME" />
    </property>
    <property name="lastName">
      <column name="LASTNAME"/>
    </property>
    <property name="email">
      <column name="EMAIL"/>
    </property>
  </class>
</hibernate-mapping>

Session sess = factory.openSession();
Transaction tx;
try {
     tx = sess.beginTransaction();
     //do some work
     ...
     tx.commit();
}
catch (Exception e) {
     if (tx!=null) tx.rollback();
     throw e;
}
finally {
     sess.close();
}