<?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 package="cars">
   <class name="Option" table="OPTIONS">
      <id name="id" column="OPTION_ID" type="integer">
         <meta attribute="use-in-tostring">true</meta>
         <meta attribute="use-in-equals">true</meta>         
         <generator class="native" />
      </id>   
      <property name="optionName" type="string" column="OPTION_NAME" unique="true" not-null="true" />   
   </class>   
</hibernate-mapping>

<?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 name="SessionFactory">
        <property name="hibernate.bytecode.use_reflection_optimizer">false</property>
        <property name="hibernate.cache.provider_class">org.hibernate.cache.NoCacheProvider</property>
        <property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
        <property name="hibernate.connection.password">password</property>
        <property name="hibernate.connection.pool_size">1</property>
        <property name="hibernate.connection.url">jdbc:mysql://localhost:3306/cars</property>
        <property name="hibernate.connection.username">root</property>
        <property name="hibernate.current_session_context_class">thread</property>
        <property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
        <property name="hibernate.show_sql">true</property>
        <mapping resource="cars/Option.hbm.xml" />
    </session-factory>
</hibernate-configuration>

public class OptionHome {

    private static final Log log = LogFactory.getLog(OptionHome.class);

    private final SessionFactory sessionFactory = getSessionFactory();
   
    protected SessionFactory getSessionFactory() {
        try {
            return (SessionFactory) new InitialContext().lookup("SessionFactory");
        }
        catch (Exception e) {
            log.error("Could not locate SessionFactory in JNDI", e);
            throw new IllegalStateException("Could not locate SessionFactory in JNDI");
        }
    }   
    ........ //Some more irrelevant code
}

public class HibernateUtil {

    private static final SessionFactory sessionFactory;

    static {
        try {
            // Create the SessionFactory from hibernate.cfg.xml
            sessionFactory = new Configuration().configure().buildSessionFactory();
        } catch (Throwable ex) {
            // Make sure you log the exception, as it might be swallowed
            System.err.println("Initial SessionFactory creation failed." + ex);
            throw new ExceptionInInitializerError(ex);
        }
    }

    public static SessionFactory getSessionFactory() {
        return sessionFactory;
    }

}