Consulta no Hibernate

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-reverse-engineering PUBLIC "-//Hibernate/Hibernate Reverse Engineering DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-reverse-engineering-3.0.dtd">
<hibernate-reverse-engineering>
  <schema-selection match-catalog="transport"/>
  <table-filter match-name="clientes"/>
  <table-filter match-name="endereco"/>
  <table-filter match-name="usuario"/>
</hibernate-reverse-engineering>

<?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>
    <class name="transys.pojo.Usuario" table="usuario" catalog="transport">
        <id name="id" type="java.lang.Integer">
            <column name="id" />
            <generator class="identity" />
        </id>
        <property name="login" type="string">
            <column name="login" length="20" />
        </property>
        <property name="senha" type="string">
            <column name="senha" length="100" />
        </property>
        <property name="nomeReal" type="string">
            <column name="nome_real" length="50" />
        </property>
        <property name="email" type="string">
            <column name="email" length="150" />
        </property>
        <property name="nivel" type="java.lang.Short">
            <column name="nivel" />
        </property>
    </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>
    <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/transport</property>
    <property name="hibernate.connection.username">root</property>
    <property name="hibernate.connection.password">SENHA</property>
    <property name="hibernate.show_sql">true</property>
    <property name="hibernate.current_session_context_class">thread</property>
    <mapping resource="transys/pojo/Clientes.hbm.xml"/>
    <mapping resource="transys/pojo/Usuario.hbm.xml"/>
    <mapping resource="transys/pojo/Endereco.hbm.xml"/>
  </session-factory>
</hibernate-configuration>

private void buildUsuarioOptions() {
    List<Usuario> usuarioList = null;
    try {
        Session session = HibernateUtil.getSessionFactory().getCurrentSession();
        org.hibernate.Transaction tx = session.beginTransaction();
        org.hibernate.Query q = session.createQuery("From usuario");
        //org.hibernate.Query q = session.createSQLQuery("SELECT * FROM usuario");
        usuarioList = (List<Usuario>) q.list();
    } catch (Exception e) {
        info("Erro: "+e.getMessage());
        e.printStackTrace();
    }

    this.listaUsuarioOptions = new Option[usuarioList.size()];
    int i = 0;
    for (Usuario item : usuarioList) {
        info("Usuario: "+item.getLogin());
        Option opt = new Option(item.getId(), item.getLogin());
        this.listaUsuarioOptions[i++] = opt;
    }
}