Debugging "separate output directories for each JVM language"

My build framework has dozens of plugins from about 5 different sources. Since moving to 4.0, i get this warning. Now I fixed it in every place i could find. Is there a way to debug what plugin from what vendor is causing the error?

I think you are referring to a chaneg imn Gradle 4.0 itself -> The link contains a way of turning off the behaviour

You should be able to pinpoint the origin of the deprecation message by running with -s.