Configure Gradle to publish sources and javadoc

Question

How do I configure Gradle to publish sources and javadoc jars to a repository?

Answer 1

Paolo Fulgoni's answer used to work for until I bumped up my Gradle version to 3.1. To get the packageJavadoc Task to work with Gradle 3.1 I found I had to make a slight tweak to it as follows:

task packageJavadoc(type: Jar) {
    from javadoc
    classifier = 'javadoc'
}