The baby and the bathwater

[Cédric Champeau]

Although I doubt that making sure a library _only_ works on the module path
is a good idea, would it make sense to introduce a helper method for this
check? Something like:

Module.assertOnModulePath()

?

2018-03-28 9:41 GMT+02:00 Remi Forax <forax at univ-mlv.fr>:

> yes,
> !Whatever.class.getModule().isNamed()
>
> Rémi
>
> ----- Mail original -----
> > De: "Peter Levart" <peter.levart at gmail.com>
> > À: "mark reinhold" <mark.reinhold at oracle.com>, "jigsaw-dev" <
> jigsaw-dev at openjdk.java.net>
> > Envoyé: Mercredi 28 Mars 2018 09:28:23
> > Objet: Re: The baby and the bathwater
>
> > On 03/26/18 20:08, mark.reinhold at oracle.com wrote:
> >> Stephen closes with a specific suggestion:
> >>
> >>    "There needs to be a way for a library author to insist that the
> >>     modular jar file they are producing can only be run on the
> module-path
> >>     (with any attempt to use it on the class-path preventing application
> >>     startup).  This would eliminate the need for testing both class-path
> >>     and module-path."
> >
> > That's easy to enforce in runtime. Just take a "victim" class from your
> > library that is most often needed when your library is being used (or
> > take a couple of them) and add a class initialization block like the
> > following to them:
> >
> > public class Whatever {
> >
> >     static {
> >         if (Whatever.class.getModule().getName() == null) {
> >             throw new Error("Can only use this library as a module");
> >         }
> >     }
> >
> >
> > Regards, Peter
>