code: @Override
    public File getFile() throws IOException {
      String realPath = RequestUtils.getRealPath(this.servletContext, this.path);
      return new File(realPath);
    }
docs: This implementation delegates to <code>ServletContext.getRealPath</code>,
  but throws a FileNotFoundException if not found or not resolvable.
  
  @see javax.servlet.ServletContext#getRealPath(String)