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Lobsters1 min readrelease notesintro

JDK 27 has been released

Read on openjdk.orgHN 4·1 commentsLobsters 37

Summary

JDK 27 became GA on 15 Sep 2026 with binaries from Oracle. It ships default G1 GC, post‑quantum TLS key exchange, default compact object headers, and several preview features such as structured concurrency and lazy constants.

  • JDK 27 reached General Availability on 15 Sep 2026; binaries are available from Oracle.
  • G1 is now the default garbage collector in all environments.
  • TLS 1.3 adds a post‑quantum hybrid key exchange (JEP 527).
  • Structured Concurrency is in its seventh preview (JEP 533).

Java developers and platform engineers need to know the new defaults and security enhancements for production deployments.

4/10
securityconcurrencyjavagarbage collectionjdk

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