Could not determine the dependencies of task ':app:dokka'

Question

I'm trying to use dokka on my android project to generate kdoc. But I have this error when I'm running the script 'modules:app [dokka]' : Could not determine the dependencies of task ':app:dokka'. kotlin.KotlinNullPointerException (no error message)

I added the following lines on my gradle files :

Project build.gradle

buildscript {
    ext {
        dokka_version = '0.9.18'
    }
    dependencies {
        classpath "org.jetbrains.dokka:dokka-android-gradle-plugin:$dokka_version"
    }
}

app build.gradle

plugins {
    id 'org.jetbrains.dokka-android'
}
dokka {
    outputFormat = 'html'
    sourceDirs = files('src/main')
    outputDirectory = "$buildDir/javadoc"
}

Could not determine the dependencies of task ':app:dokka'. kotlin.KotlinNullPointerException (no error message)

nope. And i'm already using gradle plugins dsl syntax : plugins { id ...} — Alan, Jun 05 '19 at 12:32
I think you need to explicitly tell Gradle what version to use: `id 'org.jetbrains.dokka-android' version '0.9.18' — user2340612, Jun 05 '19 at 15:52
the version is already in the classpath, so no need to explicitly tell the version when applying the plugin — Alan, Jun 05 '19 at 16:18
I don't know if it has some impact but it's a multi module project, and there's a multiplatform ios/android module in addition to the android app — Alan, Jun 05 '19 at 16:57

Alan · Accepted Answer · 2019-07-04T12:36:31.317

The issue is that it's a multiplatform project. In the app level gradle file, I'm also applying the org.jetbrains.kotlin.multiplatform plugin. As described in the dokka github release page:

Experimental Kotlin Multiplatform support is scheduled for 0.9.19

Looks like there's no other solution than wait for the next release of dokka.

Edit: There's a workaround described on the kolinlang forum

dokka {
    impliedPlatforms = ["common"] // This will force platform tags for all non-common sources e.g. "JVM"
    kotlinTasks {
        // dokka fails to retrieve sources from MPP-tasks so they must be set empty to avoid exception
        // use sourceRoot instead (see below)
        []
    }
    sourceRoot {
        // assuming there is only a single source dir...
        path = kotlin.sourceSets.commonMain.kotlin.srcDirs[0]
        platforms = ["common"]
    }
}

Could not determine the dependencies of task ':app:dokka'

1 Answers1