Applying plugin to subprojects doesn't work

[ydavygora]

Hello,

I'm running into an issue with a multiproject setup (using Gradle 8.12). My top level build.gradle.kts is minimal:

plugins {
    id("org.jlleitschuh.gradle.ktlint") version ("12.1.2")
}

allprojects {
    repositories {
        mavenCentral()
    }
}

subprojects {
    // apply(plugin = "org.jlleitschuh.gradle.ktlint")
}

ktlint {
    version = "1.5.0"
}

If I leave the line commented, then the code in the subprojects does not get formatted/checked. If I uncomment the line, here's the error I get:

./gradlew clean ktlintFormat

FAILURE: Build failed with an exception.

* What went wrong:
org/jetbrains/kotlin/gradle/dsl/KotlinProjectExtension
> org.jetbrains.kotlin.gradle.dsl.KotlinProjectExtension

* Try:
> Run with --stacktrace option to get the stack trace.
> Run with --info or --debug option to get more log output.
> Run with --scan to get full insights.
> Get more help at https://help.gradle.org.

If I run this with stacktrace, the first three lines are:

* Exception is:
java.lang.NoClassDefFoundError: org/jetbrains/kotlin/gradle/dsl/KotlinProjectExtension
        at org.jlleitschuh.gradle.ktlint.KtlintPlugin$applyKtLint$1.invoke(KtlintPlugin.kt:81)
        at org.jlleitschuh.gradle.ktlint.KtlintPlugin$applyKtLint$1.invoke(KtlintPlugin.kt:19)
        at org.jlleitschuh.gradle.ktlint.KtlintPlugin$sam$org_gradle_api_Action$0.execute(KtlintPlugin.kt)
...

To be honest, I am not sure if I am doing anything wrong or if there is a bug in the plugin. In any case I would be really grateful for your assistance. If you need more input from me (more logs, a minimal working or, rather, failling example), please let me know and thank you very much in advance!

[ydavygora]

Minimal example: https://github.com/ydavygora/ktlint_example

[matsudamper]

What about adding it to root's build.gradle.kts?

plugins {
    id("org.jlleitschuh.gradle.ktlint") version ("12.1.2")
+    kotlin("jvm") version ("2.1.0") apply false
}

[ydavygora]

Hi @matsudamper ,

the apply false kind of defeats the purpose of having it at the root project level. My intention was for it to not only format/lint the code in subprojects, but also to format the build.gradle.kts and settings.gradle.kts files in the root project. It's just a nitpicky thing, and it's by no means any high priority or anything, I was just wondering if there was a way to format files both in the root project and subprojects. But I can also live with formatting the two kts files in the root project manually, it's not like they change very often

[ydavygora]

Oh, sorry @matsudamper , I misunderstood you. You were talking about the kotlin-jvm plugin, not the ktlint plugin. I will try this, thanks!

[ydavygora]

It works! Thank you very much again, @matsudamper and sorry for the initial misunderstanding!