slachiewicz opened a new pull request, #331:
URL: https://github.com/apache/maven-clean-plugin/pull/331
`siteMvn` is passed to `doCreateTask` whole, not iterated:
```groovy
def siteMvn = params.containsKey('siteMvn') ? params.siteMvn : '3.9.x'
...
doCreateTask( os, jdk, siteMvn, tasks, first, 'site', taskContext )
```
and `doCreateTask` does `jenkinsEnv.mvnFromVersion(os, "${maven}")`. A
Groovy List stringifies to `"[4.0.x]"`, which matches no `case` in
`mvnFromVersion` and falls through to `default: return 'maven_3_latest'` — so
the site stage has been running on Maven 3 with no error. Passing a String
fixes it.
`maven:` is correctly a List — that one *is* iterated (`for (def mvn in
mavens)`). Only `siteMvn` has this problem. apache/maven-deploy-plugin already
passes it as a String.
Verified by reading the shared library only; a Jenkins pipeline cannot be
run locally. Note this does not by itself turn the Jenkins build green —
`maven_4_latest` on the build nodes still resolves to 4.0.0-rc-5, so a pom with
`<prerequisites>` of rc-6 is rejected either way. This change makes the
configuration do what it already says.
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