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Java 21 will be was released in on 19th September 2023. This will be is an LTS release, two years after Java 17.

Status: Early access.

Page last updated: 2023-03-29, EA 15

Schedule (proposed):

• 2023-06-08 Rampdown Phase One

• 2023-07-20 Rampdown Phase Two

• 2023-08-10 Initial Release Candidate

• 2023-08-24 Final Release Candidate

• 2023-09-19 General Availability

Resources:General availability.

Resources

• https://jdk.java.net/21/release-notes

• https://jdk.java.net/21/

• Schedule, status and features

Selected

...

changes targeted to Java 21

• https://openjdk.org/jeps/439

• https://openjdk.org/jeps/430

• https://openjdk.org/jeps/431

• https://openjdk.org/jeps/440

• https://openjdk.org/jeps/441

• https://openjdk.org/jeps/442

• https://openjdk.org/jeps/443

• https://openjdk.org/jeps/444

• https://openjdk.org/jeps/445

• https://openjdk.org/jeps/446

• https://openjdk.org/jeps/448

• https://openjdk.org/jeps/449

• https://openjdk.org/jeps/451

• https://openjdk.org/jeps/452

• https://openjdk.org/jeps/453

• New system property to toggle XML Signature secure validation mode (JDK-8301260)

• System.exit and Runtime.exit() Logging (JDK-8301627)

...

• https://bugs.openjdk.org/browse/JDK-8305972: Update XML Security for Java to 3.0.2

• https://bugs.openjdk.org/jeps/444browse/JDK-8267140: Support closing the HttpClient by making it auto-closable

Summary of changes since Java 17 (previous LTS)

• https://openjdk.java.net/jeps/400

• https://openjdk.java.net/jeps/421

• https://openjdk.org/jeps/431

• https://openjdk.org/jeps/440

• https://openjdk.org/jeps/441

• https://openjdk.org/jeps/444