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https://issues.apache.org/jira/browse/MNG-5830?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14587489#comment-14587489
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Ralph Goers commented on MNG-5830:
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We are seeing this error building the site for Log4j 2 with buildbot. I can't
find any documentation on this property. What is it for and why does its
absence now cause builds to fail?
> maven.multiModuleProjectDirectory system propery is not set
> -----------------------------------------------------------
>
> Key: MNG-5830
> URL: https://issues.apache.org/jira/browse/MNG-5830
> Project: Maven
> Issue Type: Bug
> Components: Bootstrap & Build, Command Line
> Affects Versions: 3.3.1, 3.3.3
> Reporter: Krzysztof Sobkowiak
> Priority: Critical
> Labels: Linux
>
> I have downloaded the newest Maven 3.3.3 and point the M2_HOME to the
> directory with unpacked Maven. {{mvn -v}} produces following error (whereas
> the versions prior to 3.1.1 worked correctly)
> {code}
> kso@lenovo:/tmp$ export
> M2_HOME=/home/kso/work/pde/dev/maven/apache-maven-3.3.3/
> kso@lenovo:/tmp$ mvn -v
> -Dmaven.multiModuleProjectDirectory system propery is not set. Check $M2_HOME
> environment variable and mvn script match.kso@lenovo:/tmp$
> {code}
> The same problem when I want to build any maven project.
> Below the same output with Maven 3.2.5 to give you informations about my
> environment
> {code}
> kso@lenovo:/tmp$ export
> M2_HOME=/home/kso/work/pde/dev/maven/apache-maven-3.2.5/
> kso@lenovo:/tmp$ mvn -v
> Apache Maven 3.2.5 (12a6b3acb947671f09b81f49094c53f426d8cea1;
> 2014-12-14T18:29:23+01:00)
> Maven home: /home/kso/work/pde/dev/maven/apache-maven-3.2.5
> Java version: 1.7.0_71, vendor: Oracle Corporation
> Java home: /home/kso/work/pde/run/jvm/jdk1.7.0_71/jre
> Default locale: en_US, platform encoding: UTF-8
> OS name: "linux", version: "3.16.0-38-generic", arch: "amd64", family: "unix"
> {code}
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