The first part of this talk is an overview of the state of the art of application development with Spring Boot 2.2 and Kotlin:
- Immutable @ConfigurationProperties data classes
- Testing with JUnit 5 and Mockk
- The new router DSL for Spring MVC
- Coroutines support for WebFlux, RSocket and Spring Data
- Kotlin code snippets in Spring Framework documentation
- MockMvc Kotlin DSL
- Best practices (extensions, constructor based injection, etc.)

The second part is a livecoding of a Spring Boot application configured with the Kofu, the Kotlin DSL currently developed in the Spring Fu incubator I have created a few months ago. It is an alternative to Spring Boot auto-configuration designed for configuring your application explicitly with auto-completion and custom configuration slices while still supporting most of Spring Boot features.