Configuration cfg = new Configuration()
                .addFile(new File("Person2.hbm.xml"))
                .setProperty("hibernate.dialect", "org.hibernate.dialect.PostgreSQLDialect")
                .setProperty("hibernate.connection.url", "jdbc:postgresql://localhost/hibernate")
                .setProperty("hibernate.connection.driver_class", "org.postgresql.Driver")
                .setProperty("hibernate.connection.username", "test")
                .setProperty("hibernate.connection.password", "test")
                .setProperty("hibernate.order_updates", "true")
                .setProperty("hibernate.hbm2ddl.auto", "update")
                .setProperty("hibernate.show_sql", "false");


        SessionFactory sessions = cfg.buildSessionFactory();

        Session session = sessions.openSession();

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
        "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
        "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">

<hibernate-mapping>
    <class entity-name="Person2" table="PERSON2">
        <id name="id" column="P_ID" type="long">
            <generator class="native"/>
        </id>
        <property name="age" type="integer" column="P_AGE" index="P_AGE_INDEX"/>
        <property name="firstname" type="string" column="P_FIRSTNAME"/>
        <property name="lastname" type="string" column="P_LASTNAME"/>
    </class>
</hibernate-mapping>