To reproduce: run "mvn clean -DskipTests" for optaplanner-persistence-jackson on 8.x and 7.x. On 7.x it takes 0.5 seconds, on master it takes 2.5 seconds.
Same applies to all other jars.
This is a side effect of dropping OSGi, which changed the pom type from "bundle" to "jar", with jboss-parent and optaplanner-build-parent in the mix.

Any changes should probably be applied to optaplanner-build-parent.
Do note that optaplanner-build-parent stills contains a bunch of garbage and good stuff copy-pasted from kie-parent. Not all the garbage has been removed yet, but that's a different issue (although feel free to clean some bits up too if you so desire).

Also see:
https://kie.zulipchat.com/#narrow/stream/232679-optaplanner/topic/slower.20builds.20in.208.2Ex

Important: a -Dfull build should generate javadocs. (even if we stop distributing in the zip because Javadocs must be validated during CI checks and javadocs jars must make it to maven central).