On 05/16/2013 05:42 PM, Jörg Hohwiller wrote:
is there already some slight inital draft or idea for a strategy how maven x.y
could deal with jigsaw?
I wrote up a very preliminary sketch about a year ago [1] but have not worked on it since then, and whatever worked then may or may not work with current drafts of
Jigsaw. Feel free to fork it and develop it, if the approach matches your expectations.
The idea was to generate target/generated-sources/jmod/module-info.java from pom.xml, reusing standard Maven elements to the greatest extent possible, introducing
plugin-specific configuration only for Jigsaw-specific metadata; and attach target/*.jmod as secondary artifacts. Then the generated module-info.java is just used as an
input to javac, but you would not normally see it; you would continue to work in a traditional Maven way, just with a better runtime, and stronger compile-time validation
of things like internal packages. You could even activate Jigsaw conditionally in a profile, so that the same source project could be built by a premodular JDK.
There are other possible approaches, of course. You could treat Jigsaw metadata as primary (versioned) sources, and install a Maven extension that would read
src/main/java/module-info.java early in the lifecycle and generate synthetic dependencies in the Maven model so that pom.xml is used only for other metadata. My fear was
that this (a) would be too “magical”, (b) would fail to work comfortably with other Maven features such as dependencyManagement and the release plugin.
(The comparison between Tycho and the Felix bundle plugin is instructive.)
Interoperability between Maven repositories and Jigsaw repositories is another topic, which I did not explore. You could imagine creating a unidirectional or
bidirectional mirror between the two types of repository, either static (a batch translation) or dynamic (e.g. a Nexus plugin). Or you could imagine creating a Maven
<extension> which adds a new kind of repository to Aether, so that Maven projects could declare direct Jigsaw repository additions. If and when there are some live,
realistic Jigsaw repositories, this will be more interesting to experiment with.
[1] https://bitbucket.org/jglick/jigsawmaven
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