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Spring Boot with Kotlin, functional configuration and GraalVM by Sébastien Deleuze

3,189 views · Published 14 November 2018 · 44:17 · Indexed 20 September 2026

Channel: Devoxx · 2018 · Science & Technology

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In this talk, I will live code a Spring Boot application with no annotation that will run as a native executable compiled with GraalVM. This application will leverage Kofu configuration, a Kotlin DSL designed to configure your application in a functional way.

I will also present various features currently incubated in Spring Fu project:

Kofu (Kotlin DSL) and Jafu (Java DSL) configuration for Spring Boot
Minimal set of features enabled by default
No classpath scanning, no feature enabled based on classpath detection
Both declarative (via the DSL) and programmatic (code auto-complete, allow any kind of if, for statements)
Functional configuration based on pure lambdas
Minimal reflection usage, no CGLIB proxy, no annotation processing
Faster startup and lower memory consumption
GraalVM native images support
Reactive SQL via R2DBC
Coroutines web and persistence API
I will explain where we are, what we learnt, and what's coming next in term of new Spring Framework and Spring Boot features.

 
Sébastien Deleuze 
From Pivotal
Sébastien is a Spring Framework and Reactor committer at Pivotal. He mostly works on Kotlin support across Spring portfolio, and on Web and Reactive topics. He is also part of MiXiT conference staff crew.

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