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