Build hang and CPU skyrocket with sisu-index:indexMojo

[cstamas]

Unsure (yet 😄 ) who to blame, so just linking the issue here as well:
eclipse-sisu/sisu-project#38

[cstamas]

Would be thankful for some pointers, but this seems mvnd related issue.

Using: Linux, mvn 3.8.4, mvnd 0.7.1, java11-temurin

Facts in short: on a closed source project, one module (that uses sisu-index:index mojo) build takes 9 seconds with vanilla mvn, while it takes 2:20 with mvnd, and mvnd build is stuck on sisu-index:index mojo for 2 minutes.

The setup of project is somewhat similar to test project https://github.com/cstamas/sisu-index-test but test project is trivial and cannot reproduce the issue for now with it (or the execution times are so small that issue is invisible): several plain JAR modules w/ sisu components and then a war-like module (not using war packaging but m-assembly-p) that re-indexes all sisu components in included JARs).

By using (locally patched) sisu-maven-plugin verified that in both cases (executing with mvn and with mvnd) they "do same thing" -- the indexPath and classPath are 100% same (made these two methods dump their list of URLs https://github.com/eclipse/sisu.mojos/blob/master/src/main/java/org/eclipse/sisu/mojos/IndexMojo.java#L176 and https://github.com/eclipse/sisu.mojos/blob/master/src/main/java/org/eclipse/sisu/mojos/IndexMojo.java#L188).

Still, for some reason while running in mvnd, this takes 2:20 total time, while in mvn it finishes in 9 seconds.

[cstamas]

Found the culprit:
https://github.com/mvndaemon/mvnd/blob/master/common/src/main/java/org/mvndaemon/mvnd/common/MavenDaemon.java#L31

Adding same change to mvn/index mojo makes vanilla mvn run same goal for 2:20 as well...