Interesting AI-focused pieces and starting to look forward towards JDK 27.

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Weekly roundup of Java ecosystem news covering distributed cache invalidation patterns with Spring Boot and Redis, flaky test elimination, Spring Boot 4.1.0-RC1 and multiple maintenance releases, JDK 27 updates, Jakarta Persistence 4.0 Milestone 2, IntelliJ IDEA 2026.1.1, and various Spring project releases including security CVE fixes. Also includes technical musings on making illegal states unrepresentable and Netflix infrastructure engineering.

Java Weekly, Issue 643