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https://issues.apache.org/jira/browse/MNG-7087?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17281302#comment-17281302
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Guillaume Nodet commented on MNG-7087:
--------------------------------------
Fix available at https://github.com/apache/maven/pull/442
> Maven 4 can't build itself with Java 11
> ---------------------------------------
>
> Key: MNG-7087
> URL: https://issues.apache.org/jira/browse/MNG-7087
> Project: Maven
> Issue Type: Bug
> Affects Versions: 4.0.0-alpha-1
> 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
> Reporter: Maarten Mulders
> Priority: Blocker
> Fix For: 4.0.x-candidate
>
> Attachments: screenshot-1.png, screenshot-2.png
>
>
> 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:
> {code}
> [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
> {code}
> I've done `git bisect` (first time, I hope I did it correctly):
> {code}
> 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
> {code}
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