code: @Override
      public InputStream getInputStream() throws IOException {
          InputStream inputStream = fileItem.getInputStream();
          return (inputStream != null ? inputStream : new ByteArrayInputStream(new byte[0]));
      }
docs: Return an InputStream to read the contents of the file from.
  
  @return the contents of the file as stream, or an empty stream if empty
  @throws IOException in case of access errors (if the temporary store fails)