Ajuda com Impressão Jasperreport

try {  
              
                	
            String imprEtiq = "cupom";
            ServletContext context = getServletContext();  
            JasperReport relat = (JasperReport)JRLoader.loadObject(  
                    context.getRealPath("/WEB-INF/reports/recibomensalidadesfiscal.jasper"));  
           
            
            // parâmetros, se houverem  
            Map<String, String> parametros = new HashMap<String, String>();

                        
            String matricula = request.getParameter("matricula");
            
            parametros.put("matricula", matricula);
                           
            // direciona a saída do relatório para um stream
            
            JasperPrint jasperPrint = JasperFillManager.fillReport(relat,parametros,conn);
            ByteArrayOutputStream arrayOutputStream = new ByteArrayOutputStream();
            JasperExportManager.exportReportToPdfStream(jasperPrint, arrayOutputStream);
            PrintRequestAttributeSet pras = new HashPrintRequestAttributeSet();
            //pras.add(new Copies(1));
            PrintServiceAttributeSet psas = new HashPrintServiceAttributeSet();
            psas.add(new PrinterName(imprEtiq, null));
            JRPrintServiceExporter exp = new JRPrintServiceExporter();
            exp.setParameter(JRExporterParameter.JASPER_PRINT, jasperPrint);
            exp.setParameter(JRPrintServiceExporterParameter.PRINT_REQUEST_ATTRIBUTE_SET, pras);
            exp.setParameter(JRPrintServiceExporterParameter.PRINT_SERVICE_ATTRIBUTE_SET, psas);
            exp.setParameter(JRPrintServiceExporterParameter.DISPLAY_PAGE_DIALOG, Boolean.FALSE);
            exp.setParameter(JRPrintServiceExporterParameter.DISPLAY_PRINT_DIALOG, Boolean.FALSE);
            exp.exportReport();