j'ai un servlet contenant une méthode print() pour appeler un jasper report en pdf, mais ne fonctionne pas je ne trouve pas où est l'erreur

servlet
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public void print(String numBac,HttpServletRequest request, HttpServletResponse response) {
		try {
			JasperDesign jasperDesign = JRXmlLoader
					.load("fiche.jrxml");
			String sql = "SELECT * FROM etudiant "
					+ "INNER JOIN filiere ON etudiant.code_f=filiere.code_f "
					+ "INNER JOIN lieu_nais ON etudiant.code_lieu=lieu_nais.code_lieu "
					+ "INNER JOIN montant ON etudiant.code_m=montant.code_m WHERE bac='"
					+ numBac + "'";
			JRDesignQuery newQuery = new JRDesignQuery();
			newQuery.setText(sql);
			jasperDesign.setQuery(newQuery);
			JasperReport report = JasperCompileManager
					.compileReport(jasperDesign);
 
                        byte[] byteStream = JasperRunManager.runReportToPdf(report, null, cnx);                            
                        OutputStream outStream = response.getOutputStream();
                        response.setHeader("Content-Disposition","inline, filename=fiche.pdf");
                        response.setContentType("application/pdf");
                        response.setContentLength(byteStream.length);
                        outStream.write(byteStream,0,byteStream.length);   
 
 
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
 
protected void processRequest(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        response.setContentType("text/html;charset=UTF-8");
        PrintWriter out = response.getWriter();
 
 
        try {
            out.println("<!DOCTYPE html>");
            out.println("<html>");
            out.println("<head>");
            out.println("<title>Servlet SignUp</title>");
            out.println("</head>");
            out.println("<body>");
            out.println("<h1>M./Mlle. " + e.getNom()+"</h1> </br>");
            out.println("<h1>"+msg+"</h1>");
            out.println("</body>");
            out.println("</html>");
        } finally {
            print(e.getBac(),request,response);
            out.close();
        }
    }