Publish a multi-release JAR

[wrandelshofer]

"We use your java8 code in jackson-core. If you publish a jar with your java8 branch code that would be great - we would change our build to use your published jars and that shades the class packages to include them in jackson-core jar.

One solution would be to append '-java8' to the artifact name (and '-java17' for the java17 jar). Or maven supports 'classifiers' which basically lead to a similar result."

Originally posted by @pjfanning in #22 (comment)

[wrandelshofer]

Class shading does not work with modular Java anymore: if two modular Jar files contain the same package, the JVM refuses to start.

So, maybe, I should build a modular multi-release JAR?

This would allow to deploy a single JAR file that contains all the various code variants that we currently have in the java8, java11, java... branches.

[wrandelshofer]

The code in the dev branch now builds a multi-release jar.