/**
* @hibernate.class table = "Sample"
*          
*/

public class Sample {

   private Long id;
   private int nr;
   private String description;

   public Sample() {
      super();
      // TODO Auto-generated constructor stub
   }

   public Sample(int nr, String description) {
      super();
      // TODO Auto-generated constructor stub
      this.nr = nr;
      this.description = description;
   }
   
   /**
    *  @hibernate.id column = "sample_id"
    *             generator-class = "identity"
    */
   
   public Long getId() {
      return id;
   }

   public void setId(Long id) {
      this.id = id;
   }

   /**
    * @hibernate.property column = "nr"
    * not-null="false"
    */
   
   public int getNr() {
      return nr;
   }

   public void setNr(int nr) {
      this.nr = nr;
   }

   /**
    * @hibernate.property column = "description"
    * not-null="false"
    * length="100"
    */

   public String getDescription() {
      return description;
   }

   public void setDescription(String description) {
      this.description = description;
   }
}

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

"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">

<hibernate-configuration>
<session-factory>
<property name="hibernate.connection.username">root</property>
<property name="hibernate.connection.url">jdbc:mysql://localhost/hibernate</property>
<property name="dialect">org.hibernate.dialect.MySQLInnoDBDialect</property>
<property name="hibernate.connection.password">admin</property>
<property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
<property name="show_sql">true</property>
<!-- -->
<property name="transaction.factory_class">org.hibernate.transaction.JDBCTransactionFactory</property>
<property name="hibernate.cache.provider_class">org.hibernate.cache.HashtableCacheProvider</property>
<property name="hibernate.hbm2ddl.auto">update</property>
<!--  configuration pool via c3p0
-->
<property name="c3p0.acquire_increment">1</property>
<property name="c3p0.idle_test_period">100</property>
<!--  seconds
-->
<property name="c3p0.max_size">50</property>
<property name="c3p0.max_statements">0</property>
<property name="c3p0.min_size">4</property>
<property name="c3p0.timeout">100</property>
<!--  seconds
-->
<!--  DEPRECATED very expensive property name="c3p0.validate>
-->
<mapping resource="mapping\simple_inheritance\Osoba.hbm.xml"/>
<mapping resource="mapping\simple_inheritance\Sample.hbm.xml"/>
</session-factory>
</hibernate-configuration>

Sample s = new Sample(1,"blabla");
      Transaction t = null;
      try{
         
         Configuration cfg = new Configuration().configure();
         sessionFactory = cfg.buildSessionFactory();
         session = sessionFactory.openSession();
         
         t = session.beginTransaction();
         session.save(s);
         t.commit();
      }
      catch(Exception e)
      {   
         e.printStackTrace();
      }
      finally
      {
         session.close();
         sessionFactory.close();
      }