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https://issues.apache.org/jira/browse/MNG-5965?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16739080#comment-16739080
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Hudson commented on MNG-5965:
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Build unstable in Jenkins: Maven TLP » maven » MAVEN-3.6/MNG-6399 #19
See
https://builds.apache.org/job/maven-box/job/maven/job/MAVEN-3.6%252FMNG-6399/19/
> Parallel build multiplies work if multiple goals are given
> ----------------------------------------------------------
>
> Key: MNG-5965
> URL: https://issues.apache.org/jira/browse/MNG-5965
> Project: Maven
> Issue Type: Bug
> Components: Bootstrap & Build
> Affects Versions: 3.3.9
> Environment: Windows 7 64bit
> Reporter: Matthias Schmalz
> Assignee: Michael Osipov
> Priority: Major
> Fix For: 3.6.1
>
> Attachments: parallel.test.zip
>
> Time Spent: 20m
> Remaining Estimate: 0h
>
> When I run a parallel build which invokes multiple goals Maven multiplies the
> work e.g. when I run
> install sonar:sonar
> Every phase is executed once as expected. However when I run
> install sonar:sonar -T 4
> Every phase is executed twice.
> The problem can be reproduced with a single simple Java project (of course
> parallel builds are useless with a single module). Debugging showed that
> every Mojo is really called twice per project.
> Find attached a simple project and two build outputs, where you can see that
> the parallel build is doing everything twice (you can ignore that Sonar fails
> in the end, due to no server is up).
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