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