how to trigger a servlet from JSF

[lynn fann]

i tried to call a servlet but i have the following error:
Cannot forward a response that is already committed

my managed bean code:

  
    public void doSavePdfConfirmationPage() throws Exception{
        FacesContext context = FacesContext.getCurrentInstance();
        ExternalContext ctx = context.getExternalContext();
        HttpServletResponse response = (HttpServletResponse)ctx.getResponse();
        HttpServletRequest request = (HttpServletRequest)ctx.getRequest();
        RequestDispatcher view = request.getRequestDispatcher("/GetPagePdfFormat");
        view.forward(request,response);
    }
  

servlet:

   
     public void doPost(HttpServletRequest request, HttpServletResponse  response) throws ServletException, IOException
     {
         try {

             JasperReport jasperReport = getJaserReport(); 

             ByteArrayOutputStream pdfStream = new ByteArrayOutputStream();
                net.sf.jasperreports.engine.JasperPrint jasperPrint = JasperFillManager.fillReport(jasperReport,  new HashMap(), new JREmptyDataSource());
               JasperExportManager.exportReportToPdfStream(jasperPrint, pdfStream);
                pdfStreamByteArray = pdfStream.toByteArray();
               Debug.println("stream to bytearray");

             FacesContext context = FacesContext.getCurrentInstance();
              response = (HttpServletResponse)context.getExternalContext().getResponse();

             Debug.println("start OutputStream");
             OutputStream os = response.getOutputStream();

             response.setContentType("application/pdf"); 

             // contentType
             response.setContentLength(pdfStream.length);
              response.setHeader("Content-disposition", "attachment; filename=myTest1.pdf");
             os.write(pdfStream); // fill in bytes
             os.flush();
             os.close();
             context.responseComplete();
         }
         catch (Exception e) {
             e.printStackTrace();
         }
     }
 

[Tim Holloway]

My definition of "call" a servlet is when one item of webapp code contacts a server, gets a response, and acts on the response. What you're actually attempting to do is to forward. that is, to, "call" without returning.

JSF is designed to manage requests from end to end, so forwarding is a problem.

However, based on your sample code, I don't know if you really even need JSF for what you're trying to do.

JSF is not a "Master Control Program" that has to be totally in control at all times. It's an assistance framework that acts on individual request/response cycles. If you have a particular client request that doesn't need JSF's forms support, don't try and force it. Instead, write a servlet or JSP and let that servlet/JSP handle the request exactly as you would in a non-JSP app.

[lynn fann]

but from servlet, how do i access my managed bean values?