I have a complex multi-module Kotlin multi-platfor...

# gradle

[Norbi]

I have a complex multi-module Kotlin multi-platform project.
It has a buildSrc module loading several common Gradle plugins, used by precompiled script plugins:

// buildSrc/build.gradle.kts

dependencies {
    implementation("org.jetbrains.kotlin:kotlin-gradle-plugin:1.9.10")
    ...
}

The project had no Android support, but now I'd like add the Android plugin as well to one of the sub-modules.

It seems that I have to add it to buildSrc as well, otherwise I get the error (which seems to be a Gradle classloading conflict):

Unable to load class 'com.android.build.gradle.api.BaseVariant'.

So I added it to buildSrc as well:

// buildSrc/build.gradle.kts

dependencies {
    implementation("org.jetbrains.kotlin:kotlin-gradle-plugin:1.9.10")
    ...
    implementation("com.android.tools.build:gradle:8.1.1")
}

Gradle sync now works in Idea but when I try to compile the project, errors like the following appear:

Cannot locate tasks that match ':kotlinw:kotlinw-remoting-client-ktor:compileJava' as task 'compileJava' not found in project ':kotlinw:kotlinw-remoting-client-ktor'.

Which I don't understand because the given project is a Kotlin-only project, it has no Java sources, and the Android plugin is not applied to it...

Do you have any idea what is happening? Thanks.

[xoangon]

Which plugins are you applying in your kotlinw-remoting-client-ktor Gradle project?

[Norbi]

It has these plugins applied directly:

plugins {
    kotlin("multiplatform")
    kotlin("plugin.serialization")
}

And in the root build.gradle.kts there is a plugin applied to it in "legacy" style:

subprojects {
    ...
    apply(plugin = "maven-publish")
    ...

[xoangon]

I can see in the Jetbrains Compose Multiplatform template that they're applying both the kotlin("multiplatform") plugin and the id("com.android.library") ones for their shared module. Can you try adding this last one?

[Norbi]

I removed my Android-related experimentation and tried to add 3 modules (android, desktop, shared) of the template project you suggested.

Building the project failed with the same error as before.
Then I've realized that if Android artifacts are included in the project, the Idea CTRL+F9 shortcut changes to executing compileJava , like

Executing tasks: [:buildSrc:compileJava, :buildSrc:testClasses] in project /home/norbi/project/workspace/buildSrc

and

Executing tasks: [:kotlinw:kotlinw-remoting-client-ktor:compileJava, ...] in project /home/norbi/project/workspace

So, if I do not build using CTRL+F9 but directly executing assemble from the Gradle Tool Window, the build is successful 🙂

Now I have to figure out what should I bind to CTRL+F9 to build the project because assemble seems to perform too much operations.

[Norbi]

Maybe this is the same issue? https://youtrack.jetbrains.com/issue/KTIJ-24048/MPP-project-with-an-android-target-cant-[…]use-of-Task-compileJava-not-found-in-project-common-error
I was wondering what makes my project setup so special that this issue arise... at least it seems that most people do not run into this problem.