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https://issues.apache.org/jira/browse/MNG-7392?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17477194#comment-17477194
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Michael Osipov commented on MNG-7392:
-------------------------------------
You should turn that into a sample.
> External test dependency's transitive internal dependency not regarded for
> build ordering
> -----------------------------------------------------------------------------------------
>
> Key: MNG-7392
> URL: https://issues.apache.org/jira/browse/MNG-7392
> Project: Maven
> Issue Type: Bug
> Reporter: Peter Palaga
> Priority: Major
>
> Not 100% sure this is a bug. In any case, it is an interesting corner case
> and I feel a need to write it down somewhere.
> Lets have a source tree like the following
> {code}
> org.foo:parent
> |- org.foo:a
> `- org.foo:b
> {code}
> Where "a before b" is the order of the {{<modules>}} in {{org.foo:parent}}
> Further, {{org.foo:a}} depends on {{org.bar:external}} in scope test. Note
> that {{org.bar:external}} is external, i.e. not a part of the current
> tree/reactor.
> And finally, {{org.bar:external}} depends on {{org.foo:b}}.
> I'd naively expect maven to be able to figure out that {{org.foo:b}} needs to
> get built before {{org.foo:a}}, because otherwise {{org.foo:a}} cannot be
> built due to a missing transitive dependency {{org.foo:b}}.
> But in reality, Maven is not able to do that. It orders {{org.foo:a}} before
> {{org.foo:b}} in the reactor and the build fails.
> Reordering the {{<module>}} elements in {{org.foo:parent}} is a workaround
> for stock Maven, but apparently it does not work for mvnd which still
> attempts to build {{org.foo:a}} and {{org.foo:b}} in parallel. A workaround
> valid for both mvn and mnvd is to add the following "virtual" dependency to
> {{org.foo:a}}:
> {code:xml}
> <dependency>
> <groupId>org.foo</groupId>
> <artifactId>b</artifactId>
> <version>${project.version}</version>
> <type>pom</type>
> <scope>test</scope>
> <exclusions>
> <exclusion>
> <groupId>*</groupId>
> <artifactId>*</artifactId>
> </exclusion>
> </exclusions>
> </dependency>
> {code}
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