public void getReporte2(String ruta, String op) throws ClassNotFoundException, InstantiationException, IllegalAccessException, SQLException {
    Connection conexion;
    Class.forName("com.mysql.jdbc.Driver").newInstance();
    conexion = DriverManager.getConnection("jdbc:mysql://localhost:3306/basedatos", "usuario", "contrasenia");
    String path = JSFUtil.getPath() + "/resources/images/membrete.png";
    //Se definen los parametros si es que el reporte necesita
    Map parameter = new HashMap();
    parameter.put("operador", op);
    parameter.put("P_RUTAIMAGEN", path);

    try {
        File file = new File(ruta);

        HttpServletResponse httpServletResponse = (HttpServletResponse) FacesContext.getCurrentInstance().getExternalContext().getResponse();

        httpServletResponse.setContentType("application/pdf");
        httpServletResponse.addHeader("Content-Type", "application/pdf");

        JasperReport jasperReport = (JasperReport) JRLoader.loadObjectFromFile(file.getPath());

        JasperPrint jasperPrint = JasperFillManager.fillReport(jasperReport, parameter, conexion);

        JRExporter jrExporter = null;
        jrExporter = new JRPdfExporter();
        jrExporter.setParameter(JRExporterParameter.JASPER_PRINT, jasperPrint);
        jrExporter.setParameter(JRExporterParameter.OUTPUT_STREAM, httpServletResponse.getOutputStream());

        if (jrExporter != null) {
            try {
                jrExporter.exportReport();
            } catch (JRException e) {
                e.printStackTrace();
            }
        }

    } catch (Exception e) {
        e.printStackTrace();
    } finally {
        if (conexion != null) {
            try {
                conexion.close();
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }
}

public void verReporte2(String ape) throws SQLException, ClassNotFoundException, InstantiationException, IllegalAccessException {

    reporteDetalle rDetalle = new reporteDetalle();

    FacesContext facesContext = FacesContext.getCurrentInstance();
    ServletContext servletContext = (ServletContext) facesContext.getExternalContext().getContext();
    String ruta = servletContext.getRealPath("/resources/reportes/deudaXalumno.jasper");

    //le pasamos los paramtros al reporte
    rDetalle.getReporte2(ruta, ape);
    //rCliente.getReporte(ruta);
    FacesContext.getCurrentInstance().responseComplete();
}

<p:menuitem value="Listado de Alumnos con deudas" actionListener="#{alumnoDataController.verReporte2(loginBean.toString())}" icon="ui-icon-close" ajax="false"/>