code: public long getLong(String key) {
      String value = getString(key);
      if (StringUtils.isNotEmpty(value)) {
        return Long.parseLong(value);
      }
      return 0L;
    }
docs: Effective value as {@code long}.
  @return the value as {@code long}. If the property does not have value nor default value, then {@code 0L} is returned.
  @throws NumberFormatException if value is not empty and is not a parsable {@code long}