Configuração Programatica Hibernate 3

<?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.dialect">org.hibernate.dialect.MySQLDialect</property>
    <property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
    <property name="hibernate.connection.url">jdbc:mysql://localhost:3306/tremdados</property>
    <property name="hibernate.connection.username">root</property>
    <property name="hibernate.connection.password">admin</property>
    <property name="hibernate.show_sql">true</property>
    <property name="hibernate.format_sql">true</property>
    <property name="current_session_context_class">thread</property>
    <mapping resource="Persistencia/Usuario.hbm.xml"/>
    <mapping resource="Persistencia/Cliente.hbm.xml"/>
  </session-factory>
</hibernate-configuration>

<property name="current_session_context_class">thread</property>

package Persistencia;
import org.hibernate.cfg.AnnotationConfiguration;
import org.hibernate.SessionFactory;
public class HibernateUtil {
    private static final SessionFactory sessionFactory;
    static {
        try {
       sessionFactory = new AnnotationConfiguration()
                    .setProperty("hibernate.dialect", "org.hibernate.dialect.MySQLDialect")
                    .setProperty("hibernate.connection.driver_class", "com.mysql.jdbc.Driver")
                    .setProperty("hibernate.connection.url", "jdbc:mysql://localhost:3306/tremdados")
                    .setProperty("hibernate.connection.username", "root")
                    .setProperty("hibernate.connection.password", "admin")
                    .setProperty("current_session_context_class", "thread")
                    .setProperty("hibernate.show_sql", "true")
                    .setProperty("hibernate.format_sql", "true")
//---------------- c3p0 inicio -------------------------------------------------------------------
//                    .setProperty("hibernate.c3p0.acquire_increment", "1")
//                    .setProperty("hibernate.c3p0.idle_test_period", "100")
//                    .setProperty("hibernate.c3p0.max_size", "10")
//                    .setProperty("hibernate.c3p0.max_statements", "0")
//                    .setProperty("hibernate.c3p0.min_size", "5")
//                    .setProperty("hibernate.c3p0.timeout", "100")
//---------------- c3p0 fim-------------------------------------------------------------------
                    .addResource("Persistencia/Cliente.hbm.xml")
                    .addResource("Persistencia/Usuario.hbm.xml").buildSessionFactory();
        } catch (Throwable ex) {
            System.err.println("Initial SessionFactory creation failed." + ex);
            throw new ExceptionInInitializerError(ex);
        }
    }
    public static SessionFactory getSessionFactory() {
        return sessionFactory;
    }
}

.setProperty("current_session_context_class", "thread")