[jira] [Created] (MNG-5890) In reactor projects, having a "root" counterpart to "project" properties would be useful

["Jordan Zimmerman (JIRA)" <ji...@apache.org>]

Jordan Zimmerman created MNG-5890:
-------------------------------------

             Summary: In reactor projects, having a "root" counterpart to "project" properties would be useful
                 Key: MNG-5890
                 URL: https://issues.apache.org/jira/browse/MNG-5890
             Project: Maven
          Issue Type: Improvement
          Components: Bootstrap & Build, core, General
    Affects Versions: 3.3.3
            Reporter: Jordan Zimmerman


Often, in reactor builds, modules need to refer to a properties relative to the root pom. E.g.:

{noformat}
root-pom.xml
\___ module1-pom.xml
         \___ sub-module1-pom.xml
\___ module2-pom.xml
         \___ sub-module2-pom.xml
{noformat}

In this example, there's no way to set a dependency in the root pom that uses the root pom's parent version. This is because ${project.parent.version} will be evaluated relatively in module1/2 and sub-module1/2. In module1/2, it will refer to the root's parent. But, in sub-module1/2 it will refer only to the root.

Ideally, we could do something like this:

{code:type=xml}
<parent>
    <groupId>my.group</groupId>
    <artifactId>foo</artifactId>
    <version>1.2.3</version>
</parent>

<dependencyManagement>
    <dependencies>
        <dependency>
            <groupId>my.group</groupId>
            <artifactId>a-different-artifact-in-my.group</artifactId>
            <version>${root.parent.version}</version>
        </dependency>
    </dependencies>
</dependencyManagement>
{code}

With this "root" feature, ${root.parent.version} would refer to the same value at every level of the reactor build.



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