Duplicate files copied in APK META-INF/library_release.kotlin_module

Question

I recently added two Android libraries through JitPack and I have the following error:

Duplicate files copied in APK META-INF/library_release.kotlin_module
         


        

Answer 1

As suggested in the post Kotlin M13 is out! by jetbrains:

Make sure these .kotlin_module files are not stripped by your packaging process.

So, we can't use exclude option to exclude this resource file from being generated.

As descripted in Kotlin M13 is out!, we should:

in Maven we use groupId and artifactId for module names, but you can say

    com.example.mymodule

in Gradle it’s project name + build task name, to customize:

compileKotlin {
    kotlinOptions.moduleName = "com.example.mymodule"    
}

This is my configuration for Android library project:

ext {
    GROUP_ID = 'custom.group.id'
    ARTIFACT_ID = 'artifactid'
}

android {
    compileSdkVersion 25
    buildToolsVersion "25.0.0"

    compileOptions {
        kotlinOptions.freeCompilerArgs += ['-module-name', "$GROUP_ID.$ARTIFACT_ID"]
    }

    defaultConfig {
        ...
    }
    buildTypes {
        ...
    }
}

Resource file named META-INF/custom.group.id.artifactId.kotlin_module will be generated instead of META-INF/library_release.kotlin_module.No more duplicate files will be found.

You can read this post and this post for more information.