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.
