code: static public void loadConfigs(){
          IConfigLoader configLoader;
          Map<String, Object> startupConfig = Config.getInstance().getJsonMapConfig(STARTUP_CONFIG_NAME);
          if(startupConfig ==null || startupConfig.get(CONFIG_LOADER_CLASS) ==null){
              configLoader = new DefaultConfigLoader();
          }else{
              try {
                  Class clazz = Class.forName((String) startupConfig.get(CONFIG_LOADER_CLASS));
                  configLoader = (IConfigLoader) clazz.getConstructor().newInstance();
              } catch (Exception e) {
                  throw new RuntimeException("configLoaderClass mentioned in startup.yml could not be found or constructed", e);
              }
          }
          configLoader.init();
      }
docs: Locate the Config Loader class, instantiate it and then call init() method on it.
  Uses DefaultConfigLoader if startup.yml is missing or configLoaderClass is missing in startup.yml