JDK 21

This release will be the Reference Implementation of version 21 of the Java SE Platform, as specified by JSR 396 in the Java Community Process.

Status

The main-line code repository is open for bug fixes, small enhancements, and JEPs as proposed and tracked via the JEP Process.

Early-access binaries under the GPL are available here.

Schedule

2023/06/08		Rampdown Phase One (fork from main line)
2023/07/20		Rampdown Phase Two
2023/08/10		Initial Release Candidate
2023/08/24		Final Release Candidate
2023/09/19		General Availability

Features

JEPs targeted to JDK 21, so far
404:	Generational Shenandoah (Experimental)
430:	String Templates (Preview)
431:	Sequenced Collections
439:	Generational ZGC
440:	Record Patterns
441:	Pattern Matching for switch
442:	Foreign Function & Memory API (Third Preview)
443:	Unnamed Patterns and Variables (Preview)
444:	Virtual Threads
445:	Unnamed Classes and Instance Main Methods (Preview)
448:	Vector API (Sixth Incubator)
449:	Deprecate the Windows 32-bit x86 Port for Removal

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