public List<BibliotecaVO> getDrivers() {
    Criteria criteria = session.createCriteria(BibliotecaVO.class, "vo");
    ProjectionList projectionList = Projections.projectionList();
    projectionList.add(Projections.distinct(Projections.property("vo.name").as("name")));
    projectionList.add(Projections.distinct(Projections.property("vo.protocol").as("protocol")));
    criteria.setResultTransformer(new AliasToBeanResultTransformer(BibliotecaVO.class));
    return criteria.list();
}