Incompatible with jpackage and Java9+

[Searen1984]

Hello,

this project hasn't been updated a long time but still most of it works. However, I found a problem using it as a dependency for a JavaFX program which I package with the Java tool jpackage. The good news is I could solve the problem and will present the solution below. The bad news is I would like to ask you if you could please update xar with the solution? It is probably just updating one line of code. So here is my problem. I get the following error when packaging for MacOS:
Bundler Mac PKG Package skipped because of a configuration problem: java.lang.module.FindException: Unable to derive module descriptor for /[...]/target/libs/joou-java-6-0.9.4.jar

Origin: xar uses as a dependency joou-java-6 (please check here https://github.com/sprylab/xar/blob/master/xar/pom.xml). This dependency is only meant up to Java 8. I am not sure about the exact problem but it is something in connection with the Java modules.

Solution: For Java 9 and later there is the dependency joou with the same version (please check here https://github.com/jOOQ/jOOU). So replacing the artifact id "joou-java-6" with "joou" in the xar pom solved the issue for me.

For this project I would propose that you could

1. create another build which provides xar for Java 9+ like the joou project does or
2. just update the line in the pom.

For 2. I do not know if that would still work for Java 8.

Best wishes,
Alex

[hameno]

We still require compatibility with Java <9 since this is used on Android. We will not be working on this ourselves, but you are free to propose a PR with the necessary changes (separate module)

[Searen1984]

I tested the fix with Java 8 and Java 11.