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No, the highest Java compatible version in Gradle

8.3

is

20

See: https://docs.gradle.org/current/userguide/compatibility.html

Support for building with Java 21 is scheduled for Gradle 8.4, according to the public roadmap https://github.com/orgs/gradle/projects/31/views/1

you can get java 21 working today with

./gradlew wrapper --gradle-version=8.4-rc-1

https://docs.gradle.org/8.4-rc-1/release-notes.html