code: public void setRevocationURL(final String url) {
          license.add(Feature.Create.stringFeature(REVOCATION_URL, url));
      }
docs: Set the revocation URL. This method accepts the url as a string that
  makes it possible to use a string that contains the
  <code>${licenseId}</code> place holder.
  
  @param url the url from where the revocation information can be
  downloaded