code: public static synchronized void bootstrap(String[] args, String... extraArgs) {
  		AppStarter.startUp(args, extraArgs);
  
  		boot();
  
  		App.scan(); // scan classpath for beans
  
  		// finish initialization and start the application
  		onAppReady();
  
  		boot();
  	}
docs: Initializes the app in non-atomic way.
  Then scans the classpath for beans.
  Then starts serving requests immediately when routes are configured.