Recuperando um DAO

public class QueueDAO {

    private String token;
    
    @PersistenceContext( name = "jdbc/gateway" )
    private EntityManager entityManager;
    
    private final static Logger LOGGER = Logger.getLogger( QueueDAO.class );

    public QueueDAO() {
    }

    public EntityManager getEntityManager() {
        return entityManager;
    }

    public void setEntityManager(EntityManager entityManager) {
        this.entityManager = entityManager;
    }

    public Collection<Package> getPackages(Long idSMS, int limit) {
        long startTime = System.currentTimeMillis();
        String query = "select * from \"queue\".\"get_queue_to_send\"( ?, ? ) as (id_queue bigint,id_application integer," +
                "msisdn varchar,message varchar,more_info varchar,la varchar,type_server varchar,\"class\" varchar," +
                "ip varchar,port integer,\"path\" varchar,weight integer);";
        Collection<Package> packages = null;
        try {
            packages = this.getEntityManager().createNativeQuery( query )
                    .setParameter( 1, idSMS )
                    .setParameter( 2, limit )
                    .getResultList();
        } catch(Exception e) {
            LOGGER.error( this.token, new Throwable( e ) );
        }
        return packages;
    }

}

protected void processRequest(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
        response.setContentType("text/html;charset=UTF-8");
        PrintWriter out = response.getWriter();
        try {

            QueueDAO dao = new QueueDAO();
            try {
                Collection<Package> packages = dao.getPackages( 5L, 100 );
                for (Package pkg : packages) {
                    out.println( pkg.getCustomer().getMsisdn() );
                }
            } catch(Exception e) {
                e.printStackTrace();
            }
        } finally { 
            out.close();
        }
    }