Amazon Corretto 27 Released with Enhanced Java Performance and Security Features
Amazon Corretto 27, a production-ready OpenJDK distribution, introduced default G1 garbage collection and post-quantum TLS 1.3 key exchange among new performance and security enhancements.
By Lucas Hayes· Editorial pseudonym· 2026-09-21 · 1 min read
AI-ASSISTED REPORTING · RETROSPECTIVE ARCHIVE
Retrospective edition: 2026-09-21. Source published: 2026-09-17. Added to this archive: 2026-11-03. This briefing was prepared later from the linked announcement; it was not published on this website on the historical edition date.
Corretto 27 made G1 the default garbage collector across all supported platforms, delivering more consistent JVM pause times. It also incorporated a hybrid classical and post-quantum key exchange for TLS 1.3, advancing defenses against emerging quantum computer threats.
Additional notable features included default compact object headers, improved structured concurrency APIs, in-process data redaction for Java Flight Recorder, and ongoing incubator support for vector APIs and enhanced pattern matching. Support for Corretto 27 extends through April 2027.
Source published 2026-09-17. This report was prepared with AI assistance from the linked primary-source material. Claims and limitations should be checked against the original announcement or research.