When I execute gradle with the following command:
./gradlew publishToMavenLocal -PsplainVersion=null
I got the following error:
...
> Could not resolve all files for configuration ':graph-commons:scalaCompilerPlugins'.
> Could not resolve io.tryp:splain_2.13.6:null.
It appears that null is not parsed properly as a control token, instead it becomes a string. Is there a method to help Gradle to understand it as a real null value?
Gradle will effectively treat anything as an argument of some kind. There is no null checking whatsoever.
So if you need to ensure a null argument is not given to your build script, then you need to validate the argument is not null where it is being used.
If you are curious of Gradle's logic, check out the source of
CommandLineParser
.