jandex does not build with Maven 3.9.0

[bdemers]

impsort-maven-plugin isn't compatible with the latest version of Maven
revelc/impsort-maven-plugin#64

Execution sort-imports of goal net.revelc.code:impsort-maven-plugin:1.6.2:sort failed: A required class was missing while executing net.revelc.code:impsort-maven-plugin:1.6.2:sort: org/codehaus/plexus/util/DirectoryScanner

impsort-maven-plugin has already released a fix and this version is already updated in smallrye-build-parent version 39.

Updating to the parent 39

• Builds successfully (locally) with Maven 3.8.7
• Reformats a handful of classes (whitespace)
• Fails with Maven 3.9.0, caused to an issue with the invoker tests (I stopped digging into the issue at this point)

[Ladicek]

Unfortunately the latest version of the impsort plugin requires Java 11, and I find it important for Jandex CI builds to run with Java 8 (among others). So this requires to jump through some hoops.

[bdemers]

I can relate, I've been working on a few projects that support older JVM's and it's increasingly becoming more difficult.