iReports-3.7.0/piechart Cannot show on web.

[umme]

Hello all,

I'm new in ireport and try to make my first report to display piechart using servlet.

I'm using netbeans 6.1 and ireport 3.7.0. I can display a simple tabular report but can't a piechart as pdf output.

There is not any warnings or errors to catch my implementation problems. Pls. help me with this....

Code:

EmployeeServlet.java:protected void processRequest(HttpServletRequest request, HttpServletResponse response)    throws ServletException, IOException {        response.setContentType("text/html;charset=UTF-8");        EmployeeReport employeeReport = new EmployeeReport();        try {            String servletPath = getServletContext().getRealPath("/");            String reportSource =servletPath +  "template/employee.jrxml";                       String reportDestPDF =servletPath +  "reports/EmployeeReport.pdf";                     params.put("reportTitle", "Hello Report World");            params.put("author", "Umme Habiba");            params.put("startDate", (new java.util.Date()).toString());            params.put("employeeChart", employeeReport.createEmployeeChartImage());                                  jasperDesign = JRXmlLoader.load(reportSource);            JasperReport jasperReport = JasperCompileManager.compileReport(jasperDesign);                       Connection conn;                        conn = dbConnection.getConnection();                                JasperPrint jasperPrint =JasperFillManager.fillReport(jasperReport, params, conn);                         JasperExportManager.exportReportToPdfFile(jasperPrint, reportDestPDF);		               ServletOutputStream servletOutputStream = response.getOutputStream();                       JasperExportManager.exportReportToPdfStream(jasperPrint, servletOutputStream);                       JasperViewer.viewReport(jasperPrint);            response.setContentType("application/pdf");            servletOutputStream.flush();            servletOutputStream.close();                            } catch (JRException ex) {                     Logger.getLogger(EmployeeSevlet.class.getName()).log(Level.SEVERE, null, ex);                    }     } ------------------------------createEmployeeChartImage():------------------------------public java.awt.Image createEmployeeChartImage(){        java.util.Hashtable employeeData = getEmployeeData();              DefaultPieDataset data = new DefaultPieDataset();              for(java.util.Enumeration e = employeeData.keys(); e.hasMoreElements();){            String employeeName = (String)e.nextElement();            System.out.println("dataset key element... " + employeeName);            data.setValue(employeeName, (Double)employeeData.get(employeeName));        }                JFreeChart chart = ChartFactory.createPieChart("Employee Chart", data, true, true, true);                     return chart.createBufferedImage(500, 220);    }