How to download dependency sources for Gradle project in IDEA?

It appears that the eclipse plugin uses the following mechanism to do this:

apply plugin: 'java'
apply plugin: 'eclipse'

eclipse {
    classpath {
       downloadSources=true
    }
}

but I can't find a corresponding option for the idea plugin. What am I missing?

Here's the build.gradle file:

apply plugin: 'groovy'
apply plugin: 'idea'

repositories {
	mavenCentral()
	mavenRepo name: "Grails", url: "http://repo.grails.org/grails/repo/"
}

dependencies {
	groovy 'org.codehaus.groovy:groovy-all:2.0.4'
	compile 'org.slf4j:slf4j-log4j12:1.6.6', 'postgresql:postgresql:9.1-901.jdbc4', 'net.sourceforge.nekohtml:nekohtml:1.9.16'
	['core', 'hibernate', 'plugin-datasource', 'plugin-domain-class'].each { plugin ->
		compile "org.grails:grails-$plugin:2.1.0"
	}
}

idea {
	module {
		downloadJavadoc = true
		downloadSources = true
	}
}

// Fat Jar Option (http://docs.codehaus.org/display/GRADLE/Cookbook#Cookbook-Creatingafatjar)
jar {
	from { configurations.compile.collect { it.isDirectory() ? it : zipTree(it) } }
}

task wrapper(type: Wrapper) {
	gradleVersion = '1.0'
}

I've got problems with the following configuration:

idea {
module {
// if you hate browsing Javadoc
downloadJavadoc = false

    // and love reading sources :)
    downloadSources = true
}

}
repositories {
mavenLocal()
mavenCentral()
}

When removed mavenLocal() sources were downloaded and attached.

For Kotlin DSL:

plugins {
    idea
}

idea {
    module {
        isDownloadJavadoc = true
        isDownloadSources = true
    }
}

I noticed that when you already have a jar downloaded then its sources and not downloading after changing build.gradle.

Removing .m2 from my home directory and calling gradle helped.

If you need to keep mavenLocal() repository due to dependencies on snapshot jars (or some other reasons), you can get the source jar using maven.

mvn dependency:get -Dartifact=GROUP_ID:ARTIFACT_ID:VERSION:jar:sources

For example,

mvn dependency:get -Dartifact=org.springframework:spring-core:5.1.2.RELEASE:jar:sources