Gradle compileKotlin includeRuntime not adding runtime to jar - gradle

Question

I have a Kotlin Gradle project, and I would like to include Kotlin's runtime and stdlib in the jar file. I'm currently using this, but it's not including the runtime or stdlib when I build the project using the build.gradle configuration.
compileKotlin {
kotlinOptions {
includeRuntime = true
noStdlib = false
}
}
This is the Gradle code I'm using to include the runtime/stdlib in the jar, but it isn't working like I expect it to. Here's the full build.gradle file for some context:
https://github.com/BenWoodworth/CrossPlatformGreeter/blob/bd1da79f36e70e3d88ed871bc35502ecc3a852fb/build.gradle#L35-L43
Kotlin's Gradle documentation seems to indicate that setting kotlinOptions.includeRuntime to true should include the Kotlin runtime in the resulting .jar.
https://kotlinlang.org/docs/reference/using-gradle.html#attributes-specific-for-kotlin
Edit:
This might be related. When I run compileKotlin, I'm getting a couple of warnings related to the runtime:
:compileKotlin
w: Classpath entry points to a non-existent location: <no_path>\lib\kotlin-runtime.jar
BUILD SUCCESSFUL

Answer 1

Here's an alternative I came up with. It'll add the Kotlin runtime and stdlib to the jar using the jar task.
jar {
from {
String[] include = [
"kotlin-runtime-${version_kotlin}.jar",
"kotlin-stdlib-${version_kotlin}.jar"
]
configurations.compile
.findAll { include.contains(it.name) }
.collect { it.isDirectory() ? it : zipTree(it) }
}
}

Answer 2

Gradle Kotlin DSL:
tasks.withType<Jar> {
val include = setOf("kotlin-stdlib-1.4.0.jar")
configurations.runtimeClasspath.get()
.filter { it.name in include }
.map { zipTree(it) }
.also { from(it) }
}

Answer 3

Try this:
Build script
Unpack jar
Add kotlin runtime and rapack it
type gradle packJar to create jar with kotlin runtime in it
or
type gradle runJar to create and run the jar file
build Script