As mentioned in the issue tracker, a temporary workaround is to add the following to the root build.gradle script:
kotlin
subprojects { subProject ->
afterEvaluate {
if (subProject.plugins.hasPlugin("kotlin") && subProject.plugins.hasPlugin("java-library")) {
subProject.kotlin.copyClassesToJavaOutput = true
subProject.jar.duplicatesStrategy = DuplicatesStrategy.EXCLUDE
}
}
}
See: https://issuetracker.google.com/issues/68021152#comment12