Spring Boot 4.0 is dropping next November, still rolling on Java 17 but loaded with fresh goodies. Stéphane Nicoll and Brian Clozel will guide you through upgrading an existing app, using Spring’s new Nullness metadata and JSpecify checks to squash those pesky NullPointerExceptions before they hit production.
On top of that, you’ll get more control over your dependencies thanks to fine-grained Spring Boot modules, a snazzier Jackson 3.0 integration with modern defaults, and a peek at how to fire off async REST calls with RestClient—no reactive types needed.
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