FYI <Gradle 9.0.0-M9> is now published. It includes updates to Kotlin 2 and the K2 Compiler, as well...

# gradle

[Oleg Nenashev]

FYI Gradle 9.0.0-M9 is now published. It includes updates to Kotlin 2 and the K2 Compiler, as well as bumping to Java 17 as a minimum version, and most of the deprecation removals. Testers and any feedback are welcome!

More about the upcoming Gradle 9 release: https://gradle.org/whats-new/gradle-9/

[suresh]

Does Kotlin Multiplatform build work correctly with Gradle 9.0? In a sample project I tested, some tasks produced the following error (regardless of whether the configuration cache was used).

For wasm target,

* What went wrong:
Configuration cache state could not be cached: field `__packageJsonFiles__` of task `:wasmRootPackageJson` of type `org.jetbrains.kotlin.gradle.targets.js.npm.tasks.RootPackageJsonTask`: error writing value of type 'org.gradle.api.internal.provider.DefaultListProperty'
> Resolution of the configuration ':web:wasmJsNpmAggregated' was attempted without an exclusive lock. This is unsafe and not allowed.

[suresh]

@tapchicoma do you have any info on 9.0 support?

[hfhbd]

IMHO the whole JS Gradle stuff should be revisited to not use the root project as value storage and a global lock file but a sourceSet/compilation per project based lockfile like you can in Java.
And setting up the repositories in the settings file is complex.

[tapchicoma]

We are planning to improve some JS parts later this year - mostly for isolated project feature support. But this will require redoing npm dependencies integration.

[tapchicoma]

@tapchicoma do you have any info on 9.0 support?

Kotlin/JVM 2.1.21 should work with Gradle 9.0. Kotlin/KMP 2.1.21 has some issues which we are planning to address either in 2.2.10 or 2.2.20 releases.

[tapchicoma]

You could follow this issue: https://youtrack.jetbrains.com/issue/KT-55224/Compatibility-with-Gradle-9.0-release

[tapchicoma]

Update: KMP in general should also work fine with Gradle 9.0 if kotlin.kmp.isolated-projects.support is enabled (default is enabled)

[hfhbd]

Yeah, but Gradle isolated project won't work with Kotlin/JS due to https://github.com/gradle/gradle/issues/30745#issuecomment-2932529079

[tapchicoma]

This mode is also enabled if isolated projects are not enabled. It changes how KMP works with intra-projects dependencies

[suresh]

This mode is also enabled if isolated projects are not enabled.

org.gradle.unsafe.isolated-projects=false in my project, but still getting the same error for kotlin/js, wasm targets.