Running module jar programatically

[Stephane Epardaud]

OK, so now I have Java 9 + Jigsaw load my module's main method, and in
there I need to call a class from another module by reflection. That
other module is in the module path, and I know its name and version. I
can't use the boot class loader because it's not on the class path (it's
on the module path).

Is there somewhere a module registry I can use to add a read to that
other module and load classes from it?

Do I have to use a Configuration/Layer to load it? I would think not
since it's in the module path already, but it could be that it's not
loaded by the JVM since it's not directly referenced by the main module.