code: public long getLong(String key) {
          final String value = this.props.getValue(key);
          if (StringUtils.isBlank(value)) {
              return 0;
          }
  
          return Long.parseLong(value);
      }
docs: Retrieves a configuration value with the given key
  
  @param key The key of the configuration value (e.g. application.name)
  @return The configured value as long or 0 if the key is not configured