Java Tech Enthusiast
Sep 25, 2026 · Fundamentals
Java 27: Compact Object Headers Cut Heap 22%, G1 Default Everywhere, Post-Quantum TLS
Java 27 introduces four production-ready features requiring no code changes: compact object headers reduce heap usage by 22% and object header size by 33%, G1 becomes the universal default garbage collector, TLS 1.3 adds hybrid post-quantum key exchange, and JFR sanitizes sensitive data before leaving the process.
Compact Object HeadersG1 Garbage CollectorJDK 27
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