code: public static Config getConfig()
      {
          final Configuration systemConfig = new SystemConfiguration();
          final String configName = systemConfig.getString(CONFIG_PROPERTY_NAME);
          final String configLocation = systemConfig.getString(CONFIG_LOCATION_PROPERTY_NAME);
          Preconditions.checkState(configLocation != null, "Config location must be set!");
          final ConfigFactory configFactory = new ConfigFactory(URI.create(configLocation), configName);
          return new Config(configFactory.load());
      }
docs: Loads the configuration. The no-args method uses system properties to determine which configurations
  to load.
  
  -Dness.config=x/y/z defines a hierarchy of configurations from general
  to detail.
  
  The ness.config.location variable must be set.
  If the ness.config variable is unset, the default value "default" is used.
  
  @throws IllegalStateException If the ness.config.location variable is not set.