code: @Override
    public boolean exists() {
      try {
        URL url = this.servletContext.getResource(this.path);
        return (url != null);
      } catch (MalformedURLException ex) {
        return false;
      }
    }
docs: This implementation checks <code>ServletContext.getResource</code>.
  
  @see javax.servlet.ServletContext#getResource(String)