Spring Boot 4.0 Sneak Peek

Spring Boot 4.0 lands next November (Java 17 still the baseline), so Brian Clozel and Stéphane Nicoll are taking their existing app on an upgrade adventure. Along the way they’ll eliminate future NullPointerExceptions using Spring’s new Nullness metadata and JSpecify nullability checks, and fine-tune dependencies with Spring Boot’s fresh, more modular approach.

On top of that, you’ll get a smoother Jackson 3.0 integration—less boilerplate, modern default configs—and see how to fire off asynchronous REST calls with RestClient, no reactive types required.

Watch on YouTube