Yea, spring boot. When 90% of what you're doing on the backend is gluing a bunch of different Java technologies together, Clojure becomes hard to justify. Fortunately, mixing JVM languages together on the same project isn't a big deal so you can bring in some targeted Clojure where needed.

Kotlin is great because it's the closest thing to a general-purpose Java replacement I've seen. The interop support between Kotlin and Java is outstanding.