Java 27: What's New?

Java 27 has reached feature completion with 9 JEPs bringing incremental improvements rather than major new features. Key updates include making G1 the default garbage collector across all environments due to performance parity with Serial GC, implementing post-quantum hybrid key exchange for TLS 1.3 to protect against future quantum computing threats, and enabling compact object headers by default to reduce heap memory usage and improve performance by up to 22%.