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https://issues.apache.org/jira/browse/MNGSITE-519?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17916967#comment-17916967
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Matthias Bünger commented on MNGSITE-519:
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https://issues.apache.org/jira/browse/MNGSITE-362 is also about this
> Update the plugin merge note in lifecycle docs
> ----------------------------------------------
>
> Key: MNGSITE-519
> URL: https://issues.apache.org/jira/browse/MNGSITE-519
> Project: Maven Project Web Site (Moved to GitHub Issues)
> Issue Type: Improvement
> Reporter: Giovanni van der Schelde
> Priority: Minor
>
> Seeing the warning message in 3.9 and the error message in 4.0.0-alpha-5 I
> assume this is intended behaviour. However, I couldn't find the tickets or
> release notes related to it, so it might be a MNG question?
> If it is an intended breaking change the docs should probably get updated.
> The
> [docs|https://github.com/apache/maven-site/blob/5c32e14114d2bbf28f958024e37a960bfd7b8121/content/apt/guides/introduction/introduction-to-the-lifecycle.apt#L144]
> state:
> {quote}Multiple instances of the same plugin are grouped to execute together
> and ordered in Maven 2.0.11 and above
> {quote}
> Whenever I define the same plugin twice in the {{pom.xml}} it merges the
> configuration with 3.9 (does give a warning about possible deprecation in
> higher versions) but fails in 4.0.0-alpha-5 with a clear error message.
> {{[ERROR] Some problems were encountered while processing the POMs}}
> {{[ERROR] The build could not read 1 project -> [Help 1]}}
> {{[ERROR]}}
> {{[ERROR] The project com.giovds:giovds-test-plugin:3.0.0-SNAPSHOT
> (C:\tmp\maven-sandbox\pom.xml) has 1 error}}
> {{[ERROR] 'build.plugins.plugin.(groupId:artifactId)' must be unique but
> found duplicate declaration of plugin
> org.apache.maven.plugins:maven-enforcer-plugin @ line 55, column 15}}
> {{[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 verbose output}}
> {{[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]}}
> MNGSITE-393 might be related.
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