https://learning.oreilly.com/attend/kotlin-spring-boot-essentials/
See slides here: as PDF
as well rxercises here http://www.kousenit.com/springbootkotlin/
Lab solutions for Spring with Kotlin course. Also used in various Kotlin with Spring presentations, including the recent Spring Live virtual conference.
The talk is here, with a messed up title:
Spring and Kotlin: A Writing Combonation, at https://www.youtube.com/watch?v=1hKXhmUeZMg
(supposed to be Spring and Kotlin: A Winning Combination, but you get the idea :)