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Hi!
There have been a number of threads regarding loading multiple
versions of the same module. The requirements say:
"It is not necessary to support more than one version of a module
within a single configuration."[1]
The threads hence usually end like this:
"The module system isn't suggesting any solutions, it is instead
leaving this problem to the build tools and containers."[2]
I can see how we can use class loaders (and now layers) to load
multiple versions at runtime. This is essentially what containers do.
Now I wonder, is there anything a build tool (or a dedicated developer
for that matter) can do to launch the JVM with multiple versions of
the same module?
Running Example:
App requires LibA
App requires LibB version 2
LibA requires LibB version 1
One way I hoped to do this was to treat both versions as two different
modules, i.e. renaming them and update the dependencies on them.
App requires LibA
App requires LibB_v2
LibA requires LibB_v1
This does not work because both modules would export the same
packages. That's a little disappointing - I hoped it wouldn't matter
because no module is reading from both versions.
Since this failed I see no way to solve this aspect of JAR hell
without containers. Does anybody else seen one?
so long ... Nicolai
[1] http://openjdk.java.net/projects/jigsaw/spec/reqs/#multiple-versions
[2]
http://mail.openjdk.java.net/pipermail/jigsaw-dev/2015-October/004787.ht
ml
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