executing jasper report from jsp page

[Buela]

I have jrxml file which retrieves data from mysql database.I would like to run this file using jsp page.When am executing jsp page jrxml file should print data in pdf format .Here is my code

                  File reportFile = new File(application.getRealPath("report/report1.jasper"));//report_name.jasper file
                Map parameters = new HashMap();
                byte[] bytes = 
    JasperRunManager.runReportToPdf(reportFile.getPath(),parameters, conn);                             
                response.setContentType("application/pdf");
                response.setContentLength(bytes.length);
                ServletOutputStream outStream = response.getOutputStream();
                outStream.write(bytes, 0, bytes.length);
                outStream.flush();
                outStream.close();
         while executing its giving exception:    
            org.apache.jasper.JasperException: An exception occurred processing JSP page /index.jsp at line 38
       38:byte[] bytes = JasperRunManager.runReportToPdf(reportFile.getPath(),parameters, conn);
             Can anybody please help me how to resolve this.

[hozawa]

You'll need to declare database connection ("conn" variable) to you mysql database.

Connection conn;
Class.forName("com.mysql.jdbc.Driver");
conn=(Connection)DriverManager.getConnection("jdbc:mysql://localhost:3306/<schema>?user=<username>&password=<password>");

 

[Buela]

I have included that but still its giving blank response