What are the key changes in Spring Boot 3.x (Jakarta EE, Java 17 baseline, virtual threads, GraalVM native images)?

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Spring Boot 3.0 (November 2022, built on Spring Framework 6) is the biggest generational change since Spring Boot 2. It modernizes the platform baseline and adds first-class support for cloud-native runtimes. Later 3.x releases build on it with virtual threads, better observabili…