Multiple Versions vs "Module Hell"

[David M. Lloyd]

It really comes down to the definition of "more than one version of a 
module".  What is the difference between more than one version of a 
module, and to different modules which happen to have very similar code 
in them?

On 06/19/2015 03:38 AM, Nicolai Parlog wrote:
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>   Hi!
>
> I am writing a series about Project Jigsaw[1] and am currently
> drafting an article about the planned features[2, 3].
>
> One paragraph in particular made me wonder:
>
> 	"It is not necessary to support more than one version of a module
> within a single configuration."[4]
>
> At first sight this looks like it would create "Module Hell" instead
> of JAR Hell because instead of multiple JARs depending on different
> versions of the same JAR, we can now have multiple modules depending
> on different versions of the same module.
>
> I guess this is not so but I don't really see why not. I assume
> encapsulating the dependencies is the answer but it would be great to
> have a less speculative and vague explanation. Maybe someone on this
> list can help me out?
>
>   Thanks in advance
>   Nicolai
>
>
> [1] blog.codefx.org/java/dev/motivation-goals-project-jigsaw/
> [2] openjdk.java.net/projects/jigsaw/goals-reqs/
> [3] http://openjdk.java.net/projects/jigsaw/spec/reqs/02
> [4]
> http://openjdk.java.net/projects/jigsaw/goals-reqs/03#multiple-versions
>
>
>
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