Hi Robert,

I would have thought that it was not Maven's responsibility to ascertain that test passed in various JDKs, old and new.

Nevertheless, there is no doubt that once you pay attention to the details, things can get messy awfully quick.

BTW, thank you for your previous response.

--
Ceki


On 3/24/2017 11:45, Robert Scholte wrote:
Hi Ceki,

the compilation-part isn't the real issue (it is acutally the easy
part), but e.g. the testing-part is.
You must ensure that surefire is also executed at least twice: once for
pre-java9 and for java9.
And what to do with other plugins which are part of the lifecycle up
until the package-phase? Very likely they need to be executed twice as
well.
If you look closer you'll see that you're actually executing 2 build
lifecycles which are in the end packaged to a single jar.
The demo-project is the purest form but comes with overhead.
Maven has a forking mechanism, but I don't think it is strong enough
(yet) to fully support this.

thanks,
Robert

On Fri, 24 Mar 2017 11:34:20 +0100, Ceki Gülcü <c...@qos.ch> wrote:


Hi All,

Currently in the process modularizing the SLF4J project in preperation
for Java 9/Jigsaw, I ran into many wrinkles most of which are due to
my own ignorance about Java 9 modules. Now that the initial phase of
modularization is done, I am looking into creating mutlti-release
jars (MR-Jars).

Herve's mutli-version demo project [1] (thanks Hervé) while
instructional, shows that MR-Jar support in Maven is perhaps lacking
at the moment.

As a developer, I really don't want to muck about with multiple maven
project modules or learn the intricacies of the maven assembly plugin
just to add module-info.java to my project's artifact.

As a moderately-skilled Maven user, I would like to see MR-Jar
supported by way of directory layout conventions, perhaps along the
lines of:

src/main/java/  -> target/classes
src/test/java/  -> target/test/classes
src/main/java-9/ -> target/classes/META-INF/versions/9
src/test/java-9/ -> target/test-classes/META-INF/versions/9

Thus, I would need to change little in my pom.xml files to support
MR-jars. Most of the leg work would be done by the compiler plug-in
and Maven conventions.

Comments?

--
Ceki

[1] https://github.com/hboutemy/maven-jep238

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