Multiple Versions vs "Module Hell"

[Nicolai Parlog]

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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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