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Next level Kotlin support in Spring Boot 4

Sébastien Deleuze - Broadcom

Spring and Kotlin teams collaborate to bring the Kotlin support to the next level in the upcoming Spring Boot 4 release, based on Spring Framework 7, to be released at the end of 2025.

In this brand new talk, Sébastien will share new features that intend to improve the developer experience and runtime efficiency of Spring Boot applications for Kotlin developers.

He will cover the new Kotlin 2 baseline, runtime efficiency improvements, better null-safety via JSpecify, GraalVM native image special Kotlin support, new DSLs, new Kotlin documentation and Spring AI Kotlin support.