What is the best MVC stack to build mobile-friendly, light-weight, and fast single-page application with Spring Boot as back-end (Java)? Is Bootstrap still required to front-end layer these days?
The idea is to host on-premise initially with the potential to move to the cloud. Which combo would have minimal developer ramp-up time and low long-term maintenance costs (BAU support)?
If you are new to all three react will be a good choice considering, react-native will be useful if you want to build cross platform mobile application today or tomorrow. If you are talking about bootstrap styling framework than it's a choice you can style ur components by ur self or use bootstrap 4.0 framework. The complete stack mentioned above is platform agnostic u can run it anywhere you want be it cloud or on-premise.
React might be a good option if you're considering a mobile app for the future, because of react native. Although, Vue.js has the easiest learning curve and offers a better developer ramp-up time. Vue.js is great to build SPAs, very clean and organized and you won't have a lot of long-term maintenance problems (like AngularJS, for example). Bootstrap can still be used, but with flexbox there's no need anymore.