This project is a collection of mini code examples written in Kotlin, which show how various concurrency problems can be handled in the backend code.
Under 01-classic-spring you can find examples of approaches classically used in Java's, as well as their potential gotchas. (A lot of this code is intentionally written incorrectly).
02-reactive-spring contains examples of using Spring's WebFlux and Akka's actors for handling concurrency.
The project 03-coroutines-ktor
shows Kotlin's own (and preferred) model of handling concurrency,
which is based on the concept of suspending functions and kotlinx.coroutines library.
04-coroutines-extra contains even more examples of using coroutines for solving various problems.