Post-Quantum Hybrid Key Exchange

Java 27 Arrives with Four Stable Features and Security and Performance Improvements

Java released version 27 on September 15, 2026, bringing nine JEP initiatives, including four stable features: adopting G1 as the default garbage collector in all environments, compact object headers, and a post-quantum-resistant hybrid key exchange. JetBrains confirmed IntelliJ IDEA support for the release from day one.