[jsr294-modularity-eg] Nested superpackages

[Eugene Vigdorchik]

Nice explanation, Andreas.
Still what happens if a superpackage is nested in more than one enclosing superpackage? As far as I understand, several deployment
units may exist that will each include the classes from nested superpackage.While Strawman says: "it is expected that a superpackage
and all its nested superpackages will form one deployment unit", it could be more specific to say that classes from nested
superpackages could be included in other deployment units as well or form a separate deployment unit by themselves.

Eugene.

Andreas Sterbenz wrote:
> 
> Glyn Normington wrote:
> > 
> > What do we really lose by deleting nested superpackages? In these 
> > situations, my feeling is that "less is more" and deleting this 
> > feature will strengthen the whole proposal.
> 
> Not having nested superpackages would mean instead of a 
> project having a top level superpackage and a nested 
> superpackage for each subsystem, all classes of the project 
> would be a member of the top level superpackage. It could 
> hide implementation details from code outside the 
> superpackage by declaring such public classes as 
> non-exported, but it would not be possible to isolate 
> subsystems within the project from each other.
> 
> In particular, a class that is used by multiple packages of a 
> subsystem would have to be a (non-exported) public class even 
> if it is an implementation detail of the subsystem. That 
> means it could accidentally be used by other subsystems 
> within the project.
> 
> In other words, we have the same problem we have today with 
> package based access control: it is not possible to hide 
> implementation details as desired. Just as we currently have 
> that issue for projects too large to be appropriate for a 
> single package, we would have the same issue for projects 
> that are too large to be appropriate for a single superpackage.
> 
> That means we would be addressing only part of the problem 
> JSR 294 set out to solve. That is not the correct goal for us.
> 
> We should keep in mind that the added conceptual weight of 
> nested superpackages is very low. They are not a concept 
> distinct from superpackages, just a recursive application of 
> the same idea. Nor do they complicate live for developers who 
> prefer to stay with a flat system and not to use nesting.
> 
> Andreas.
> 
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