This sample shows how to obtain the java sources and add a [Directory] to the list of java sources that will be used for compilation.

To access all java sources, you just need to use sourceFolders.set(variant.sources.java.all which can be used as [Task] input directly.

To add a folder and its content to the list of folders used for compilation, you need to use the [SourceDirectories.srcDir] family of methods

./gradlew :app:debugDisplayAllSources