Problemas com Hibernate + HSQLDB

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package util;

import java.sql.SQLException;
import java.util.List;
import org.hibernate.Session;
import org.hibernate.Transaction;

/**
 *
 * @author jean
 */
public class teste {
    
    private static Session session;
       
    public teste(){
        
    }
    
    public static void main(String[] args) throws SQLException{
       Transaction tx = null;   
       session = ConnectionFactory.getInstance();
       tx = session.beginTransaction();
       Pessoa jean = new Pessoa(1,"Jean");
       session.save(jean);
       tx.commit();
       List list = session.createQuery("from util.Pessoa").list();
       System.out.print(list);
       session.close();
    }
}

package util;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.AnnotationConfiguration;


/**
 * Cria Conexao remota ou local com banco
 * @author jean
 */
public class ConnectionFactory {
    private static SessionFactory sessionFactory;
    private static ThreadLocal<Session> threadLocal = new ThreadLocal<Session>();
    private static String conf = "/util/hibernate.cfg.xml";

    /**
     * Cria a conexao e decide se a mesma sera
     * local ou remota.
     */
    static{
        try{
            sessionFactory = new AnnotationConfiguration().configure("hibernate.cfg.xml")
                    .buildSessionFactory();
        }catch(Throwable t){
            throw new ExceptionInInitializerError(t);
        }
    }
    /**
     * @return Retorna a instancia da conexao
     */
    public static Session getInstance(){
        Session session = (Session) threadLocal.get();
        session = sessionFactory.openSession();
        threadLocal.set(session);
        return session;
    }
}

<?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="connection.driver_class">org.hsqldb.jdbcDriver</property>
        <property name="connection.url">jdbc:hsqldb:file:banco/dedao</property>
        <property name="connection.username">sa</property>
        <property name="connection.password"></property>
        <property name="connection.pool_size">1</property>
        <property name="dialect">org.hibernate.dialect.HSQLDialect</property>
        <property name="cache.provider_class">org.hibernate.cache.NoCacheProvider</property>
        <property name="hibernate.hbm2ddl.auto">update</property>
	<mapping class="util.Pessoa" />
    </session-factory>
</hibernate-configuration>