[MNG-7087] Maven 4 can't build itself with Java 11

• Type: Bug
• Status: Closed
• Priority: Blocker
• Resolution: Fixed
• Affects Version/s: 3.0-alpha-1
• Fix Version/s: 4.0.0-alpha-2, 4.0.0
• Environment: Apache Maven 4.0.0-alpha-1-SNAPSHOT (bb916d0784c7631866167928e4d0615df3317567) ; Java version: 11.0.10, vendor: AdoptOpenJDK, runtime: /Library/Java/JavaVirtualMachines/adoptopenjdk-11.jdk/Contents/Home
• Assignee: Robert Scholte
• Reporter: Maarten Mulders
• Created: 27/Jan/21 19:30
• Updated: 20/Oct/23 07:57
• Resolved: 13/Mar/21 12:22

Description

It's not possible to build Maven HEAD (I've tested with rev. bb916d0) using a recent Maven 4 snapshot. Even mvn validate doesn't succeed:

[INFO] Scanning for projects...
ERROR:  ''
[ERROR] [ERROR] Some problems were encountered while processing the POMs:
[WARNING] 'dependencies.dependency.(groupId:artifactId:type:classifier)' must be unique: org.junit.jupiter:junit-jupiter-params:jar -> version ${junitVersion} vs 5.7.0 @ line 77, column 17
[FATAL] input contained no data @ 
 @ 
[ERROR] The build could not read 1 project -> [Help 1]
[ERROR]   
[ERROR]   The project  (/Users/maarten/Code/open-source/maven/maven/maven-model-builder/pom.xml) has 1 error
[ERROR]     input contained no data
[ERROR] 
[ERROR] To see the full stack trace of the errors, re-run Maven with the '-e' switch.
[ERROR] Re-run Maven using the '-X' switch to enable full debug logging.
[ERROR] 
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/ProjectBuildingException

I've done `git bisect` (first time, I hope I did it correctly):

9f88494b6064ad45ea2e2e1e3478afc7af0bc065 is the first bad commit
Author: rfscholte
Date:   Mon Dec 21 22:23:43 2020 +0100

    [MNG-6957] Versionless reactor dependencies/parent should work even if modules are aggregated in reverse order
    
    This closes #391

Issue Links

• links to: GitHub Pull Request #443