Gradle ... single directory for all classes .. is scheduled to be removed in Gradle 5.0

[michael-newsrx]

Getting this deprecation warning with latest Gradle:

Gradle now uses separate output directories for each JVM language, but this build assumes a single directory for all classes from a source set. This behaviour has been deprecated and is scheduled to be removed in Gradle 5.0

[carlolf]

@michael-newsrx : I think this project is dead, Steffen has no time to maintain it.
So, I recommend you the fork of it, where this warning is a already fixed. Have a look here https://github.com/jiakuan/gwt-gradle-plugin.