Can I write a Gradle Plugin right now using Kotlin 1.9.0?

# gradle

[David Herman]

Can I write a Gradle Plugin right now using Kotlin 1.9.0?

[David Herman]

I'm using the kotlin-dsl plugin, so I'm guessing I need to wait for https://docs.gradle.org/current/userguide/compatibility.html#kotlin to get updated?

[Chris Lee]

Correct. Currently Gradle doesn’t support Kotlin 1.9. Gradle 8.3 is @ rc1 and will support Kotlin 1.9.0. https://docs.gradle.org/8.3-rc-1/userguide/compatibility.html

[David Herman]

Oh hello here as well @Chris Lee

[Chris Lee]

Hello! Is there anything in 1.9.0 that you are specifically looking for related to plugins?

[David Herman]

Nope, I just want to upgrade my project in general to 1.9.0, and I'm running into trouble with the Gradle plugin modules

[David Herman]

I removed the kotlin("jvm") plugins that you pointed out and am only using kotlin-dsl right now, but I'm still getting the same compile error

[David Herman]

so I'm guessing kotlin 1.9.0 is leaking in somehow

[Chris Lee]

Check the dependencies in your build file for the plugin, make sure kotlin isnt in there as well.

[David Herman]

I'm seeing this warning for example:

The `embedded-kotlin` and `kotlin-dsl` plugins rely on features of Kotlin `1.8.20` that might work differently than in the requested version `1.9.0`.

[David Herman]

Likely I'm pulling it in from some other dep in my code

[Chris Lee]

yep

[David Herman]

OK, sounds like I should wait for Gradle 8.3, that's the easiest

[Chris Lee]

run a build scan (paste link if you can), easy to track it down from there.

[Chris Lee]

You likely want to fix this - coupling your build environment Kotlin version to app kotlin version is not desireable.

[David Herman]

Doing that now -- I'm sure I'll see Kotlin 1.9.0 referenced in the scan

[David Herman]

I normally avoid coupling but this is a Compose project, which is why when I upgrade the Compose version I also need to upgrade the Kotlin version

[Chris Lee]

this is suspect: implementation(kotlin("stdlib"))

[Chris Lee]

and perhaps this: implementation(kotlin("gradle-plugin"))

[David Herman]

So my Gradle plugin is actually parsing user code

[Chris Lee]

and maybe this: api(kotlin("compiler-embeddable"))

[David Herman]

Might be time to move to ksp

[David Herman]

I couldn't use it when the project started

[David Herman]

since it wasn't ready for js-ir yet

[Chris Lee]

oh ugh, yea, that’s a challenge.

[David Herman]

https://scans.gradle.com/s/3rkiizd2tsjvi there's the scan, but no need to look into it unless you're curious. I can take it from here for now.

[David Herman]

Thanks for your help, again!

[Adam S]

good to see your question is solved, and just to add: hopefully the “how to write a Gradle plugin in Kotlin” docs will be improved soon https://github.com/gradle/gradle/pull/24286 🤞