`mvn package compiler:help` cause runtime issue

[hboutemy]

Affected version

4.0.0-rc-6

Bug description

found while testing apache/maven-jar-plugin#508 (comment) but clearly purely Maven core issue

on any simple Maven build with Maven 4.0.0-rc6, mvn package compiler:help makes maven-jar-plugin doing twice attach, and just before compiler:help we get a new second build header:

❯ mvn -V -DskipTests package compiler:help
Apache Maven 4.0.0-rc-6 (6a8189b24518daa120539fa41ce12f2b48ec09a8)
Maven home: /home/herve/.sdkman/candidates/maven/4.0.0-rc-6
Java version: 21.0.1, vendor: Oracle Corporation, runtime: /home/herve/.sdkman/candidates/java/21.0.1-open
Default locale: fr_FR, platform encoding: UTF-8, time zone: Europe/Paris
OS name: "linux", version: "6.8.0-137-generic", arch: "amd64", family: "unix"
[INFO] Scanning for projects...
[INFO] Loaded 23569 auto-discovered prefixes for remote repository central (prefixes-central.txt)
[INFO] 
[INFO] ----------------------------------< org.apache.maven.shared:maven-dependency-analyzer >-----------------------------------
[INFO] Building Apache Maven Dependency Analyzer 1.17.2-SNAPSHOT
[INFO]   from pom.xml
[INFO] ---------------------------------------------------------[ jar ]----------------------------------------------------------
...
[INFO] --- surefire:3.5.6:test (default-test) @ maven-dependency-analyzer ---
[INFO] Tests are skipped.
[INFO] 
[INFO] --- jar:3.5.0:jar (default-jar) @ maven-dependency-analyzer ---
[WARNING] artifact 'org.apache.maven.shared:maven-dependency-analyzer:pom:consumer:1.17.2-SNAPSHOT' already attached, replacing previous instance
[INFO] 
[INFO] ----------------------------------< org.apache.maven.shared:maven-dependency-analyzer >-----------------------------------
[INFO] Building Apache Maven Dependency Analyzer 1.17.2-SNAPSHOT
[INFO]   from pom.xml
[INFO] ---------------------------------------------------------[ jar ]----------------------------------------------------------
[INFO] 
[INFO] --- compiler:3.15.0:help (default-cli) @ maven-dependency-analyzer ---
...

[bbartete]

Do you think this would be a good issue for a first-time Maven contributor?

If so, I'd like to be affected and work on it.

Thanks!

[Ayush0612005]

I'd like to work on this issue. I’ll first reproduce the problem locally and investigate why invoking compiler:help after package leads to the reported runtime behavior. I’ll then work on a focused fix and add regression coverage to prevent the issue from recurring.

[gnodet]

Closed — fix merged in PR #12916.