code: public void load(File file) {
      try {
        PropertiesConfiguration config = new PropertiesConfiguration();
        // disabled to prevent accumulo classpath value from being shortened
        config.setDelimiterParsingDisabled(true);
        config.load(file);
        ((CompositeConfiguration) internalConfig).addConfiguration(config);
      } catch (ConfigurationException e) {
        throw new IllegalArgumentException(e);
      }
    }
docs: Loads configuration from File. Later loads have lower priority.
  
  @param file File to load from
  @since 1.2.0