Spring boot configuration to forward to index page on 404

spring-boot-angular.txt

@Bean
ErrorViewResolver redirectToFrontEndOn404() {
	return ( request, status, model ) -> status == HttpStatus.NOT_FOUND
		? new ModelAndView("forward:/index.html", Collections.<String, Object>emptyMap(), HttpStatus.OK)
			: null;
}


This is necessary on page refresh to avoid showing 404 or error pages
This forward also maintains the client route path, so angular will route to the correct route on reload.

This needs a complementary route config on the frontend, to redirect to default route on 404 on the client side