JDK 27: The New Features of Java 27
InfoWorld, Tuesday, September 15th, 2026
Nine features in the now-GA release, including G1 as universal default collector and structured concurrency.
Java Development Kit 27 is generally available with nine features.
G1 becomes the default garbage collector in all environments rather than just server environments, with goals of ensuring HotSpot always selects it and that throughput, latency, memory footprint and startup time do not degrade significantly.
Post-quantum hybrid key exchange for TLS 1.3 combines a quantum-resistant algorithm with a traditional one to defend against future quantum attacks.
Compact object headers become the default HotSpot layout, cutting headers from 96 to 64 bits on 64-bit architectures.