Speaker Details

Sébastien Deleuze


Sébastien is a Spring Framework committer at Pivotal, with a focus on Web, Reactive and GraalVM native image topics. He is also in charge of the Kotlin support across Spring portfolio and created the Spring Fu project. In his spare time, he is a member of the MiXiT conference staff.

Running Spring Boot applications as GraalVM native images

In this talk, Sébastien will share the latest status of the ongoing work performed by the Spring team to allow running Spring Boot applications as GraalVM native images for instant startup and low memory consumption.

He will talk about the out-of-the-box native image setup developed in the upcoming Spring Framework 5.3, demonstrate various Spring Boot applications running as native images and give an overview about how much of the JVM ecosystem is ready for such native runtime.

This will also be an opportunity for a pragmatic comparison between regular OpenJDK, GraalVM Community Edition and GraalVM Enterprise Edition with concrete figures.

Spring Boot
Spring Framework 5

Deepdive into Reactive Spring with Coroutines and Kotlin Flow

Spring Coroutines official support allows to go Reactive with Kotlin, WebFlux, RSocket and R2DBC (Reactive SQL) with a great balance between imperative and declarative programming, and can even be used outside of the JVM.
In this deep dive session, we are going to take a journey across building step by step a distributed chat application with Spring Boot 2.2 for the backend and Kotlin/JS for the frontend to experiment concretely with these topics:

  • Main reasons for switching from Java to Kotlin
  • State of Kotlin support in Spring Boot 2.2
  • The 3 pillars of Coroutines 1.3: suspending functions, structured concurrency and the brand new Flow type
  • Coroutines support in Spring WebFlux with @Controller and the router DSL
  • Using Coroutines in the browser with Kotlin/JS
  • Building a Reactive messaging infrastructure with RSocket
  • Reactive SQL with R2DBC
  • Configuring Spring Boot explicitly with Kofu experimental DSL from Spring Fu incubator


Spring Boot
Spring Framework 5
Reactive Programming

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