java - parseRequest gives empty list in spring -

in java method saving file using apache common file upload using spring framework when try list parserequest gives 0 size don't know why error come picture can 1 please me resolved

my code

@requestmapping(value = "/documentpdfupload", method = {requestmethod.post })     public void editedpdfupload(model model,@requestparam map<string,object> reqparams,httpservletrequest request,httpservletresponse response) throws ioexception     {         // initialize response         response.setcontenttype("text/html;charset=utf-8");         printwriter out = response.getwriter();         // check have file upload request         boolean ismultipart = servletfileupload.ismultipartcontent(request);         log.debug("ismultipart"+ismultipart);          if (ismultipart == false)         {             echomessage ("post not multipart request", out);              return;         }          // create factory disk-based file items         diskfileitemfactory factory = new diskfileitemfactory();         factory.setsizethreshold(65536);         factory.setrepository(new file("c:\\temp"));          system.out.println("factory=============================>"+factory);         enumeration paramnames = request.getparameternames();         while(paramnames.hasmoreelements())          {             string paramname = (string)paramnames.nextelement();             string[] paramvalues = request.getparametervalues(paramname);             system.out.println (paramvalues);         }           // create new file upload handler         servletfileupload upload = new servletfileupload(factory);         system.out.println("upload=============================>"+upload);         // parse request /* fileitem */         try         {             // process uploaded items             list items = upload.parserequest(request);            system.out.println("items size=============================>"+items.size());             iterator iter = items.iterator();              while (iter.hasnext())              {                 fileitem item = (fileitem) iter.next();                 if (item.isformfield() == false)                 {                     string filename = item.getname();                      file uploadedfile = new file("c:\\tmp\\" + filename);                     item.write(uploadedfile);                     break;                 }             }         }         catch (exception e)         {             echomessage("error: " + e.getmessage(), out);             e.printstacktrace();         }          // close response writer         out.close();     }