Java 21 (23.9 LTS)

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

Status: 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

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

Summary of changes since Java 17 (previous LTS)