Error: Line Charts using JasperReports

Question

Hi,

I am facing issues in generating a Line Chart using JasperReports.

I have created a .jasper file using iReport and using the same in JasperReports to generate the graph. I could do this successfully to create the tabular data using iReport and JasperReports.

However, nothing is printed in the output when i try it for a Chart. Below, is the code i am using:

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

        Map parameters = new HashMap();

        jasperPrint = JasperFillManager.fillReport("LineData.jasper", parameters, getConnection());

        JRHtmlExporter exporter = new JRHtmlExporter();
        exporter.setParameter(JRExporterParameter.JASPER_PRINT, jasperPrint);
        exporter.setParameter(JRExporterParameter.OUTPUT_WRITER,response.getWriter());

        Map imagesMap = new HashMap();
        request.getSession().setAttribute("IMAGES_MAP", imagesMap);
        exporter.setParameter(JRHtmlExporterParameter.IMAGES_MAP, imagesMap);

        exporter.setParameter(JRHtmlExporterParameter.IS_USING_IMAGES_TO_ALIGN, false);
        exporter.setParameter(JRHtmlExporterParameter.IMAGES_URI,"image?image=");

        exporter.setParameter(JRHtmlExporterParameter.OUTPUT_STRING_BUFFER,sbf);

        exporter.exportReport();
    }
    catch(JRException e) {
        System.out.println("i am an e exception");
        e.printStackTrace();
    }
    catch (Exception e1)
    {
        System.out.println("i am an  e1 exception");
        e1.printStackTrace();
    }

    finally {
        out.flush();
        out.close();
    }
}

Please let me know, if i am missing anything here.

Thanks in advance, Karthik

Answer 1

Where the data for your report are coming from? Did you tested SQL/HQL/JPQL/OtherQL that it returns non-empty result set?