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Default output directory for `module-info.class` should be `META-INF/versions/9`

See original GitHub issue

There are still a lot of old Java tools that choke when they hit a module-info.class file. It may take a long time for this problem to be solved, since old libraries pull in even older libraries in their transitive dependency graph.

META-INF/versions/9 was the location recommended by Uwe Schindler as the maximally backwards-compatible location for the module descriptor, pointed out by Alan Bateman on the jigsaw-dev mailing list recently:

http://mail.openjdk.java.net/pipermail/jigsaw-dev/2018-October/013940.html

Some tools (such as the Android toolchain) are being updated to ignore classes found in META-INF/versions for this reason:

https://issuetracker.google.com/u/0/issues/77587908

I tried using <outputDirectory> to specify where the module descriptor would be saved, but that affects the output jarfiles, not the location of module-info.class. Is there a way to save the module descriptor anywhere other than the root of the build target? If so, it would be a good idea to have the default be target/META-INF/versions/9, at least for the foreseeable future.

Issue Analytics

State:
Created 5 years ago
Comments:19 (19 by maintainers)

Top GitHub Comments

1reaction

gunnarmorlingcommented, Dec 16, 2018

Agh, so I ran into some issues with the set-up for the release today 😦 I’ll keep working on this in the course of the next days.

1reaction

gunnarmorlingcommented, Dec 12, 2018

Hey @lukehutch, thanks for the reminder! Apologies for the delay (and just ignoring your earlier question about the release, I somehow missed that). I’ll try and push out a release over the weekend.

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