code: public static StringUtils getStringUtils() {
      if (stringUtils == null) {
        try {
          Class clazz = Class.forName(STRING_UTILS);
          stringUtils = (StringUtils) clazz.newInstance();
        } catch (ClassNotFoundException | InstantiationException | IllegalAccessException e) {
          LOGGER.warn("Cannot instanciate util: {}", e.getMessage());
          throw new IllegalStateException(e);
        }
      }
      return stringUtils;
    }
docs: Retrieve StringUtils implementation
  @return StringUtils instance