Problema com hibernate: No suitable driver found for jdbc

Opa :smiley:

O driver ta no meui lib e está adicionado no classpath e meu conf.xml está da seguinte maneira:

<?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>

        <!-- Database connection settings -->
        <property name="connection.driver_class">org.postgresql.Driver</property>
        <property name="connection.url">jdbc:postgres://localhost:5432/teste</property>
        <property name="connection.username">postgres</property>
        <property name="connection.password">postgres</property>

		<property name="transaction.factory_class">org.hibernate.transaction.JDBCTransactionFactory</property>

        <!-- JDBC connection pool (use the built-in) -->
        <property name="connection.pool_size">1</property>

        <!-- SQL dialect -->
        <property name="dialect">org.hibernate.dialect.PostgreSQLDialect</property>

        <!-- Enable Hibernate's automatic session context management -->
        <property name="current_session_context_class">thread</property>

        <!-- Disable the second-level cache  -->
        <property name="cache.provider_class">org.hibernate.cache.NoCacheProvider</property>

        <!-- Echo all executed SQL to stdout -->
        <property name="show_sql">true</property>

		<mapping class="br.com.hibernate.dao.geral.test.CentroBean"/>
		<mapping class="br.com.hibernate.dao.geral.test.UniversidadeBean"/>
		
    </session-factory>

</hibernate-configuration>

O que está errado:?