[jira] [Created] (MNG-5969) Multiple times attaching the same artifact should fail the build

["Karl Heinz Marbaise (JIRA)" <ji...@apache.org>]

Karl Heinz Marbaise created MNG-5969:
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             Summary: Multiple times attaching the same artifact should fail the build
                 Key: MNG-5969
                 URL: https://issues.apache.org/jira/browse/MNG-5969
             Project: Maven
          Issue Type: Bug
          Components: core
    Affects Versions: 3.2.5, 3.2.3, 3.2.2, 3.2.1, 3.1.1, 3.4.0
            Reporter: Karl Heinz Marbaise
            Priority: Minor


If i take a look at [MNG-5939|MNG-5939] and use the example project and test it with the current version of Maven on master (f467d9142fa6c928bdae25253350915728fef286) i will get the following:
{noformat}
[INFO] --- maven-source-plugin:2.4:jar (attach-sources) @ bar ---
[INFO] Building jar: /Users/kama/Downloads/foo.bar/target/bar-0.0.1-sources.jar
[INFO]
[INFO] --- maven-source-plugin:2.4:jar-no-fork (attach-sources) @ bar ---
[INFO] Building jar: /Users/kama/Downloads/foo.bar/target/bar-0.0.1-sources.jar
[INFO] Replaced artifact foo:bar:java-source:sources:0.0.1.
[INFO]
{noformat}
First the previous behaviour (Maven 3.0.5) was to emit a {{WARNING}} which is not the case anymore. At the moment it only creates a simple output:
{noformat}
[INFO] Replaced artifact foo:bar:java-source:sources:0.0.1.
{noformat}
which is not enough. 
Furthermore I'm the opinion that in this case the build should be broken, cause this build is wrongly configured (twice executions of maven-source-plugin without changing the classifier it could also be several executions of other plugins).

Maven 3.1.1, 3.2.1, 3.2.2,  will ignore it completely without any message nor a warning etc.

Maven 3.2.3, 3.2.5 will produce no warning but will attach the artifacts twice times {{-sources}} which would fail a release like this:
{noformat}
[INFO] Installing /Users/kama/Downloads/foo.bar/target/bar-0.0.1-sources.jar to /Users/kama/.m2/repository/foo/bar/0.0.1/bar-0.0.1-sources.jar
[INFO] Installing /Users/kama/Downloads/foo.bar/target/bar-0.0.1-sources.jar to /Users/kama/.m2/repository/foo/bar/0.0.1/bar-0.0.1-sources.jar
{noformat}




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