If you want to run a Maven goal that has requiresDependencyResolution = ResolutionScope.COMPILE in its @Mojo annotation, i.e. requires that all dependencies are resolved before it runs, you face a problem in a multi-module project.
If one module references another, this other module does not exist (when you start the goal with plugin:some-goal on the parent or child), and the resolution fails.
How should I use such a Maven plugin in the context of a multi-module project?
The trick is to use requiresDependencyCollection wherever possible because it does not require the other module to be built.