Author is building a Spring MVC application but labels it as a "Kotlin app". Is it because Kotlin is the new hotness and the Spring Framework is "old" and "uncool"?
I imagine it has more to do with the fact that simply saying "Spring app" will make most people assume it's written in Java. It would perhaps be better to say it's a Kotlin Spring app, but honestly the web framework being used is probably less important than the language it's being written in.