Spring Boot 3 and Spring Framework 6: What's New

Spring Boot 3 introduces support for Java 17 as well as improved support for building reactive applications. It also includes updates to the actuator endpoints, which provide information about the health and performance of a Spring Boot application.

Spring 6 brings a number of new features and improvements, including support for the latest versions of Java and Java SE, an updated Kotlin DSL for building Spring applications, and improved support for building reactive applications with Spring WebFlux.

One of the major new features in Spring 6 is the ability to build and run Spring applications on top of the new modular Java platform, known as “Project Jigsaw”. This allows developers to create smaller, more efficient applications by only including the parts of the Spring framework that are actually needed.

Another significant new feature in Spring 6 is the ability to build and run Spring applications on top of the new reactive programming model, known as “Project Loom”. This allows developers to write asynchronous, non-blocking code that can take advantage of modern multi-core processors and scalable, event-driven architectures.

Overall, the new features in Spring Boot 3 and Spring 6 provide developers with greater flexibility and performance when building modern, cloud-native applications with the Spring framework.

Two of the changes here land immediately in day-to-day code: the security configuration in Spring Boot JWT Authentication, and the concurrency model discussed in Spring WebFlux vs Spring MVC.