2 Replies Latest reply: Feb 3, 2014 2:27 AM by Alan.M RSS

Problem with java desktop class

160389ef-9542-4e28-86c1-247f1f7aa453 Newbie
Currently Being Moderated

I need to open a external pdf file and i want to use java desktop class.

i downloaded the desktopdemo and work fine but when use the same code source in my jsp file nothing appears, no errors but nothing.

the code i

Desktop desktop = null;

if ( Desktop.isDesktopSupported()) {

    try {

        File myFile = new File(getServletContext().getRealPath("/filename.pdf"));   

        desktop = Desktop.getDesktop();


    } catch (IOException ex) {


        // no application registered for PDFs



i use tomcat 6.0 and jdk 7.0_45.

I try tu use exec command but it s the same.nothing work

thank you

  • 1. Re: Problem with java desktop class
    Alan.M Newbie
    Currently Being Moderated

    Are you trying to use the Desktop class from the servlet ?  It seems like that as far as I can see from the code.

  • 2. Re: Problem with java desktop class
    Alan.M Newbie
    Currently Being Moderated

    Desktop class as it mentioned by the name is used for desktop application such Applet and Swing Desktop applications. In the case of servlet you have virtual directory , http request and http response based on stateless condition so the response get generated on the server which can be any where etc.....

    Even the servelt security model prohib the commmuniation with peer ( Desktop class create a peer class which are interfaces with native classes, services and applciation etc..)


    To dispaly pdf reponse from an http request ( servelet response as stream ) the below not test sample code;




    public void doGet(HttpServletRequest request, HttpServletResponse response)

          throws ServletException, IOException



    ServletOutputStream stream = null;
        BufferedInputStream buf = null;
        try {
          stream = response.getOutputStream();
          File pdf = new File(getServletContext().getRealPath("/filename.pdf"));   

          response.addHeader("Content-Disposition", "attachment; filename="
              + fileName);
          response.setContentLength((int) pdf.length());
          FileInputStream input = new FileInputStream(pdf);
          buf = new BufferedInputStream(input);
          int readBytes = 0;

          while ((readBytes = buf.read()) != -1)
        } catch (IOException ioe) {
          throw new ServletException(ioe.getMessage());
        } finally {
          if (stream != null)
          if (buf != null)




    Alan Mehio



  • Correct Answers - 10 points
  • Helpful Answers - 5 points