JavaSpring Boot: Chapter 4
Spring Boot 4.0 is scheduled for next November. While the Java baseline remains at 17, it’s the perfect time to leverage new language and framework features. Stéphane and Brian will start by upgrading their existing application to Spring Boot 4.0.
Along the way, we will prevent future NullPointerExceptions in production thanks to Nullness metadata in Spring projects and JSpecify Nullability checks. We will also revisit our application dependency arrangement: Spring Boot now provides fine-grained dependencies that allow for more flexibility in your application. The new Jackson 3.0 integration simplifies our Jackson setup and updates configuration options with more modern opinions. We will also see how we can use a RestClient in asynchronous scenarios without involving Reactive types.
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Along the way, we will prevent future NullPointerExceptions in production thanks to Nullness metadata in Spring projects and JSpecify Nullability checks. We will also revisit our application dependency arrangement: Spring Boot now provides fine-grained dependencies that allow for more flexibility in your application. The new Jackson 3.0 integration simplifies our Jackson setup and updates configuration options with more modern opinions. We will also see how we can use a RestClient in asynchronous scenarios without involving Reactive types.
Stephane Nicoll
As a member of the Spring team, Stéphane has had the privilege of working on various aspects of Spring Boot and Spring Framework, with a focus on understanding its inner workings and collaborating with the fantastic community of contributors.
Connect with Stéphane ("snicoll") on Bsky, Mastodon, and GitHub to follow his ongoing journey in the world of Java development.
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