Java 20 🥱
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Java 20 ships without major finalized features but advances on multiple fronts. Security updates include disabling DTLS 1.0 and TLS_ECDH_ cipher suites. Performance gains come from new intrinsic hash functions (Poly1305, ChaCha20) and G1 GC refinements. Observability improves with new JFR events. Preview features progress: the Foreign Function & Memory API sees its second preview with Arena/SegmentScope replacing MemorySession; pattern matching in switch reaches its fourth preview and record patterns their second; virtual threads get a second preview with several utility methods finalized; structured concurrency is unchanged; and scoped values begin incubating as a better alternative to ThreadLocals. Migration notes include reduced HTTP idle connection timeouts (1200s to 30s), hollowed-out Thread.stop/suspend/resume methods, and stricter URL validation.
Table of contents
â–š Securityâ–š Performanceâ–š Observability With JFR And JMXâ–š Compiler And jmodâ–š Miscellaneousâ–š Refinements Of Preview Featuresâ–š Migration Challengesâ–š SummarySort: