Hibernate + createQuery

forma errada:
 SELECT DISTINCT Servidor.CD_SERVIDOR AS codigo ,UnidadeOrganizacional.sg_unidade_organiz AS sigla 

forma correta:
 SELECT DISTINCT Servidor.CD_SERVIDOR AS codigo, UnidadeOrganizacional.sg_unidade_organiz AS sigla

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

public class SessionFactoryUtil {

	/** The single instance of hibernate SessionFactory */
	private static org.hibernate.SessionFactory sessionFactory;

	/**
	 * disable contructor to guaranty a single instance
	 */
	private SessionFactoryUtil() {
	}

	static {
		// Annotation and XML
		sessionFactory = new AnnotationConfiguration().configure()
				.buildSessionFactory();
		// XML only
		// sessionFactory = new
		// Configuration().configure().buildSessionFactory();
	}

	public static SessionFactory getInstance() {
		return sessionFactory;
	}

	/**
	 * Opens a session and will not bind it to a session context
	 * 
	 * @return the session
	 */
	public Session openSession() {
		return sessionFactory.openSession();
	}

	/**
	 * Returns a session from the session context. If there is no session in the
	 * context it opens a session, stores it in the context and returns it. This
	 * factory is intended to be used with a hibernate.cfg.xml including the
	 * following property <property
	 * name="current_session_context_class">thread</property> This would return
	 * the current open session or if this does not exist, will create a new
	 * session
	 * 
	 * @return the session
	 */
	public Session getCurrentSession() {
		return sessionFactory.getCurrentSession();
	}

	/**
	 * closes the session factory
	 */
	public static void close() {
		if (sessionFactory != null && !sessionFactory.isClosed() )
			sessionFactory.close();
		sessionFactory = null;

	}
}

public List procurarPorData(String dataInicial, String dataFinal, String uniOperacional) {		
		session = ConnectDB.getInstance();
		Transaction tx = session.beginTransaction();
		
		/*Consulta para buscar os dados. (:) isto � para que o HQL identifique qual � o parametro de entrada*/
		/*Esta clausula utiliza os objetos do V.O por isso tem que ser case sencitive para n�o ocorrer erro*/
		Query select = session.
		createQuery("Select regVis.Reg_codigo, vis.Vis_nome, setor.Set_nome, uniOp.Uni_nome, " +
		
						"regVis.Reg_status, regVis.Reg_horaEntrada, " +
		
						"regVis.Reg_horaSaida, regVis.Reg_dataVisita, regVis.Reg_usuarioLogado " +
		
				
					"FROM RegistrarVisita regVis inner join regVis.setor setor inner join setor.uniOp uniOp inner join " +
					
						"regVis.visitante vis inner join regVis.colaborador colab " +
		");		
		
		
		//atribui um valor de entrada no parametro neste caso o valor da entrada s�o mostrados abaixo.
		select.setString("uniOperacional", uniOperacional)
		.setString("dataInicial", dataInicial)
		.setString("dataFinal", dataFinal);
		
		List list = select.list();
				
		tx.commit();
		session.close();
		
		return list;		
	}//fim

Query select = session.createSQLQuery(

public Collection<Servidor> obterPorSetor(Servidor servidor,String sigla) throws AplicacaoException{
		Session session = SessionFactoryUtil.getInstance().getCurrentSession();
		Collection<Servidor> lista = null;
		
		try {
			tx = session.beginTransaction();
	[b]		Query query = session.createQuery(" from Servidor s  where s.unidadeOrganizacional.sigla = ?  and s.situacao IN ( '01', '04')");[/b]
			query.setString(0, sigla);
			lista = (Collection<Servidor>) query.list();
			tx.commit();

		} catch (RuntimeException e) {
			throw new AplicacaoException(e.getMessage(), e);
		}

		return lista;
	}