Java 17: New and Exciting!
summary
Java 17 is the new LTS and a practical upgrade: language features like records as immutable named tuples, sealed types to restrict hierarchies and pattern matching reduce boilerplate; runtime gains include ZGC and Shenandoah for near-constant pauses (ZGC targeting ~1 ms), TLS 1.3, the new HttpClient, text blocks, helpful NPEs, unix domain sockets and jpackage for installers, and Nashorn removal. Vendors converge (Adoptium/Temurin builds) and major frameworks such as Spring 6 / Spring Boot 3 require Java 17, so plan testing for removed ciphers and license differences before upgrading.
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