Java Architecture Diary

Aug 25, 2026 · Backend Development

Spring Boot 4.2.0-M1 Released: RestTemplate Deprecated, AMQP 1.0 Support Added, Major Dependency Upgrades

Spring Boot 4.2.0-M1 milestone release deprecates RestTemplate in favor of RestClient, adds AMQP 1.0 support, introduces Buildpacks image-layer caching, removes deprecated APIs, fixes numerous bugs including structured logging and Kafka consumer security, and upgrades 20+ dependencies including Hibernate, Kafka, Kotlin, and Tomcat.