Implied readability + layers

[Ali Ebrahimi]

Hi,

On Fri, Nov 6, 2015 at 1:09 AM, Alex Buckley <alex.buckley at oracle.com>
wrote:

>
>>
> A single version of com.bar in a program is strongly presumed to be better
> than multiple versions of com.bar in a program.
>
In Ideal world this would be perfect.

But, If you use many modules from different third-parties with different
release cycles, things may change and finding this single version may be
impossible.


> I showed elsewhere that explicit readability within a parent layer causes
> class loading to behave in such a way that modules in a child layer cannot
> override modules in the parent layer. That's just how the JVM works.
> Sometimes that will rear its head as "consumers of M2 are locked to the
> same com.bar as consumers of consumers of M2", sometimes it won't,
> depending on which layers have which modules. But unlimited support for
> multiple versions in all possible layer arrangements is not a goal.

If goal is prevent from overriding as for methods in clesses why not use
'final': require final com.bar?


-- 

Best Regards,
Ali Ebrahimi