544f9c0c1b
The project doesn't compile as it is missing dependencies that are provided in its children modules (version-specific scala modules). This disables the java compilation.
pmd-scala-common
Contains shared code for the pmd-scala_2.12 and pmd-scala_2.13 modules.
It is not a module in itself, since it needs to be used while cross-compiling with a specific scala version.
It should be source compatible with the oldest scala version we are supporting.