Problem in file download dialog

Hi,
I am using the following code to download a PDF file. (Whiich is present in the database and I am retriving it using JDBC call).
                    InputStream in = null;
                    HttpServletResponse response = ctx.response();
                    response.setContentType ("application/pdf");
                    response.setHeader("Content-Disposition", "attachment; filename=\"" + fileName + "\"");
                    in = (InputStream)requestHandler.read(rparams);
                    byte[] buf = new byte[4096];
                    int len;
                    while((len = in.read(buf)) > 0)
                         out.write(buf, 0, len);
                    in.close();
                    out.flush();
                    out.close();                    
                    response.flushBuffer();
Now when user is clicking on the specified link, file download dialog is coming, if user clicks on save the file is getting saved successfully but if user clicks on OK, it is giving the error, "There was an error opening this document. The file does not exist".
Could anyone tell me what may be the problem in the code?
Thanks in advance
Amit

Following code is returning the InputStream object:
     Blob document = null;
     QueryManager qm = null;
     int status = -1;
     InputStream dataStream = null;
     String sqlReadDocument = "select document from opr_t_aw_documents where id='"+id+"' and end_date > sysdate";
     log.debug("sqlReadDocument is "+sqlReadDocument);
          try
               qm = new QueryManager();
               ArrayList inParams = new ArrayList();
               ResultSet result;
               result = qm.performPrepQuery(sqlReadDocument, inParams);
               if(result != null)
                    while(result.next())
                         document = result.getBlob(1);
                         if(document != null)
                              dataStream = document.getBinaryStream();
and out is simply response.getOutputStream().
Please let me know in case you need any further info.
Thanks,
Amit

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