Build source jar with Gradle Kotlin DSL?

[This question](

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) asks how to build a SourceJar with Gradle. How can I do the same with the Gradle Kotlin DSL?

The gradle code would be:

task sourcesJar(type: Jar, dependsOn: classes) {
classifier = 'sources'
from sourceSets.main.allSource
}

task javadocJar(type: Jar, dependsOn: javadoc) {
classifier = 'javadoc'
from javadoc.destinationDir
}

artifacts {
archives sourcesJar
archives javadocJar
}

The following will work:

val sourcesJar by creating(Jar::class) {
dependsOn(JavaPlugin.CLASSES_TASK_NAME)
classifier = "sources"
from(sourceSets["main"].allSource)
}

val javadocJar by creating(Jar::class) {
dependsOn(JavaPlugin.JAVADOC_TASK_NAME)
classifier = "javadoc"
from(tasks["javadoc"])
}

artifacts {
add("archives", sourcesJar)
add("archives", javadocJar)
}

A complete `build.gradle.kts` would look like this:

plugins {
kotlin("jvm") version "1.2.71"
}

repositories {
mavenCentral()
}

dependencies {
}

tasks {
val sourcesJar by creating(Jar::class) {
dependsOn(JavaPlugin.CLASSES_TASK_NAME)
classifier = "sources"
from(sourceSets["main"].allSource)
}

val javadocJar by creating(Jar::class) {
dependsOn(JavaPlugin.JAVADOC_TASK_NAME)
classifier = "javadoc"
from(tasks["javadoc"])
}

artifacts {
add("archives", sourcesJar)
add("archives", javadocJar)
}
}

With Gradle 5.1 you can do something like this

tasks {
val sourcesJar by registering(Jar::class) {
classifier = "sources"
from(sourceSets.main.get().allSource)
dependsOn(classes)
}
val javadocJar by registering(Jar::class) {
classifier = "javadoc"
from(javadoc.get().destinationDir)
dependsOn(javadoc)
}
}

With Gradle 5.3.1, this is a little nicer and avoids deprecated API:

tasks {
val sourcesJar by creating(Jar::class) {
archiveClassifier.set("sources")
from(sourceSets.main.get().allSource)
}

val javadocJar by creating(Jar::class) {
dependsOn.add(javadoc)
archiveClassifier.set("javadoc")
from(javadoc)
}

artifacts {
archives(sourcesJar)
archives(javadocJar)
archives(jar)
}
}

Task `assemble` will create all the artifacts.

As of **Gradle 6.0** this is a much easier and cleaner. All you need to do is:

java {
withSourcesJar()
withJavadocJar()
}

Check out the documentation on the [java extension][1], and its functions, [withSourcesJar()][2] and [withJavadocJar()][3]


[1]:

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[2]:

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--
[3]:

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--

All described methods fail with error on **Gradle 6.6**:
`SourceSet with name 'main' not found`

I've found a solution that works:
```
tasks {
val sourcesJar by creating(Jar::class) {
archiveClassifier.set("sources")
from(android.sourceSets.getByName("main").java.srcDirs)
}

artifacts {
archives(sourcesJar)
}
}
```