Spring Boot 4 and Spring Framework 7 introduce significant enhancements including built-in resilience features with @Retryable and @ConcurrencyLimit annotations, a fluent JMS client API, robust API versioning, and modular architecture. Key improvements include support for Jackson 3.x, JSpecify for null safety, enhanced SSL health reporting, multiple TaskDecorator beans support, and better integration with modern ecosystems like Kotlin 2.2 and Jakarta EE 11. The modular codebase refactoring breaks up monolithic auto-configuration JARs into focused packages, while milestone artifacts are now available in Maven Central for easier dependency management.
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