After upgrading to Gradle 6.x sometime ago I start...

# gradle

[Lex Luthor]

After upgrading to Gradle 6.x sometime ago I started to notice that after each and every build of my Kotlin project, Gradle generates Java source folders _unnecessarily_:
• src/main/java
• src/test/java
My current configuration is:

$ ./gradlew -v
------------------------------------------------------------
Gradle 6.5.1
------------------------------------------------------------

Build time:   2020-06-30 06:32:47 UTC
Revision:     66bc713f7169626a7f0134bf452abde51550ea0a

Kotlin:       1.3.72
Groovy:       2.5.11
Ant:          Apache Ant(TM) version 1.10.7 compiled on September 1 2019
JVM:          11.0.8 (<http://Amazon.com|Amazon.com> Inc. 11.0.8+10-LTS)
OS:           Linux 5.4.0-42-generic amd64

I added the following to my build.gradle.kts script but had no effect whatsoever:

sourceSets {
    main {
        java.srcDir("src/main/kotlin")
        resources.srcDir("src/main/resources")
    }
    test {
        java.srcDir("src/test/kotlin")
        resources.srcDir("src/test/resources")
    }
}

[octylFractal]

afaik Gradle itself and the Kotlin plugin never create source directories

[octylFractal]

yea, just tested -- cannot reproduce with 6.5.1 and Kotlin 1.3.72

[Lex Luthor]

After you mentioned, I started enabling/disabling Gradle plugins until I found the culprit: ktlintFormat 😢

[Lex Luthor]

Now I just need to figure out what rule is causing..

[Lex Luthor]

I am using ktlint 9.3.0

[Lex Luthor]

After further investigation, I can confirm the issue is at least partly related to Gradle.. said regression occurred while upgrading from version 6.1.1 to 6.2 of Gradle. Before 6.2 the issue does not occur regardless of what version of the ktlint plugin I set (up to the latest version 9.3.0)

[Marc Knaup]

You can use setSrcDirs with a list of directories instead of srcDir.
The former will overwrite all existing source directory settings while the latter will only add some to the existing settings.

[Lex Luthor]

Thx Marc. that is a workaround..