How do I get IntelliJ to recognize gradle generated sources dir?

Question

So I have an XJC javaExec that spins like a top but IntelliJ doesn\'t recognize the generated output despite having marked generated-src/java as such. Do I need to

Answer 1

The code of this answer, rewritten using Kotlin DSL, will look like this:

plugins {
    idea
}

val generatedSourcesPath = file("out/production/classes/generated")

java.sourceSets["main"].java.srcDir(generatedSourcesPath)

idea {
    module {
        generatedSourceDirs.add(generatedSourcesPath)
    }
}