JDK 27

This release will be the Reference Implementation of version 27 of the Java SE Platform, as specified by JSR 402 in the Java Community Process.

Status

JDK 27 is in the Release Candidate phase. The overall feature set is frozen. No further JEPs will be targeted to this release.

The stabilization branch, jdk27, is open for critical bug fixes, with approval, per the JDK Release Process (JEP 3). Integrate most such changes via backports from the main line.

• Release Candidate Bugs
• Fix-Request Process
• Bug-Deferral Process

Early-access binaries, under the GPL, are available here.

Schedule

2026年06月04日	Rampdown Phase One (branch from main line)
2026年07月16日	Rampdown Phase Two
2026年08月06日	Release Candidate Phase
2026年08月20日	Release Candidate Build
2026年09月15日	General Availability

Features

523:	Make G1 the Default Garbage Collector in All Environments
527:	Post-Quantum Hybrid Key Exchange for TLS 1.3
531:	Lazy Constants (Third Preview)
532:	Primitive Types in Patterns, instanceof, and switch (Fifth Preview)
533:	Structured Concurrency (Seventh Preview)
534:	Compact Object Headers by Default
536:	JFR In-Process Data Redaction
537:	Vector API (Twelfth Incubator)
538:	PEM Encodings of Cryptographic Objects (Third Preview)