I wrote a blog post about using Kotlin and Spring Boot 2.0 to write a reactive service https://todd.ginsberg.com/post/springboot2-reactive-kotlin/

👍 Really nice to see more and more blogs on kotlin usage on server side.

I loved this @todd.ginsberg:

When I say 'effectively infinite', I mean that I'm OK with the counter over or under flowing at some point. A Long on the JVM is a 64 bit signed integer. That means we will have to click it 1,000,000 times a second for nearly 300,000 years for anybody to notice. Personally, I'm OK with that. If some far distant civilization depends on The Counter and runs into this, I'm deeply sorry for my short-sightedness."