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https://issues.apache.org/jira/browse/HADOOP-13300?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15340570#comment-15340570
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Christopher Tubbs commented on HADOOP-13300:
--------------------------------------------
In some of the cases, it looks like the main jar artifact is being created
earlier in the build lifecycle so it is available for tests. In these cases, it
might be acceptable to override (or skip) the default execution of the
maven-jar-plugin, but it's probably better to omit the custom execution, and
instead move the tests to the integration-test phases, which exists for this
purpose.
> maven-jar-plugin executions break build with newer plugin
> ---------------------------------------------------------
>
> Key: HADOOP-13300
> URL: https://issues.apache.org/jira/browse/HADOOP-13300
> Project: Hadoop Common
> Issue Type: Improvement
> Components: build
> Reporter: Christopher Tubbs
>
> Several places throughout the Hadoop build (going back at least as far as
> 2.4.1; I didn't check earlier), extra executions of maven-jar-plugin have
> been used to create jars at different phases in the build lifecycle.
> These have typically not specified an execution id, but should have specified
> "default-jar" to override the default execution of maven-jar-plugin. They
> have worked in the past because maven-jar-plugin didn't check to verify if an
> artifact was built/attached multiple times (without using a classifier), but
> will not work when a newer version of maven-jar-plugin is used (>3.0), which
> is more strict about checking.
> This is a problem for any downstream packagers which are using newer versions
> of build plugins (due to dependency convergence) and will become a problem
> when Hadoop moves to a newer version of the jar plugin (with ASF Parent POM
> 18, for example).
> [These are the ones I've
> found|https://lists.apache.org/thread.html/2c9d9ea5448a3ed22743916d20e40a9e589bfa383c8ea65f35cb3f0d@%3Cuser.hadoop.apache.org%3E].
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