Unable to build project using JDK 21

[Artur-]

trafficstars

Describe the bug

[INFO] --- exec:3.0.0:exec (gradle) @ vaadin-gradle-plugin ---
To honour the JVM settings for this build a single-use Daemon process will be forked. For more on this, please refer to https://docs.gradle.org/8.3/userguide/gradle_daemon.html#sec:disabling_the_daemon in the Gradle documentation.
Daemon will be stopped at the end of the build 

FAILURE: Build failed with an exception.

* What went wrong:
Could not determine the dependencies of task ':compileTestKotlin'.
> Unknown Kotlin JVM target: 21

Expected-behavior

Compiles

Reproduction

mvn install

System Info

mac

[ZheSun88]

that is strange.. which branch did you run into this issue?

with the latest branch. we have a JDK test build which runs JDK 21, 22 and 17.. all tests are passed.

also by only calling mvn install, platform should not touch anything regarding gradle..

[ZheSun88]

can reproduce with running

./gradlew build on vaadin-gradle-plugin module

[ZheSun88]

let us revisit this issue when the full support from gradle has been updated. https://docs.gradle.org/current/userguide/compatibility.html

[benstpierre]

@ZheSun88 Gradle 8.5 is out and supports JDK 21

[ZheSun88]

yes we have updated grade 8.5 https://github.com/vaadin/platform/pull/4753 may i know which Vaadin version you are using?