code: public Configuration fromSystem() {
      MapConfiguration mapConfig =
          setupConfiguration(new MapConfiguration((Properties) System.getProperties().clone()));
      // Disables trimming so system properties that include whitespace (such as line.separator) will
      // be preserved.
      mapConfig.setTrimmingDisabled(true);
      return mapConfig;
    }
docs: Loads configuration from system defined arguments, i.e. -Dapi.x.y.z=abc.