@SuppressWarnings("NullableProblems")
	@Override
	public void onApplicationEvent(ContextRefreshedEvent event) {
		Home exHome = config.getExHome();
		if (exHome.exists()) {
			FileUtils.deleteQuietly(exHome.getSubFile("shutdown.lock"));
			FileUtils.deleteQuietly(exHome.getSubFile("no_more_test.lock"));
		}
	}
Application life-cycle event listener.

This class is used to clean up the several locks.

@since 3.1
ngrinder-controller/src/main/java/org/ngrinder/infra/config/ApplicationListenerBean.java