code: public static void start(final Collection<Class<?>> classes) {
          LOGGER.log(Level.DEBUG, "Initializing Latke IoC container");
  
          final Configurator configurator = getInstance().getConfigurator();
          if (null != classes && !classes.isEmpty()) {
              configurator.createBeans(classes);
          }
  
          LOGGER.log(Level.DEBUG, "Initialized Latke IoC container");
      }
docs: Starts the application with the specified bean class and bean modules.
  
  @param classes the specified bean class, nullable