code: protected ServletFileUpload createServletFileUpload(final HttpServletRequest request) {
          final DiskFileItemFactory fileItemFactory = createDiskFileItemFactory();
          final ServletFileUpload upload = newServletFileUpload(fileItemFactory);
          upload.setHeaderEncoding(request.getCharacterEncoding());
          upload.setSizeMax(getSizeMax());
          return upload;
      }
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