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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: 2023-05-19, EA 23

Schedule:

• 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/404439

• https://openjdk.org/jeps/439430

• https://openjdk.org/jeps/430431

• https://openjdk.org/jeps/431440

• https://openjdk.org/jeps/440441

• https://openjdk.org/jeps/441442

• https://openjdk.org/jeps/442443

• https://openjdk.org/jeps/443444

• https://openjdk.org/jeps/444445

• https://openjdk.org/jeps/445446

• 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/449browse/JDK-8267140: Support closing the HttpClient by making it auto-closable

Summary of changes since Java 17 (previous LTS)

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