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https://issues.apache.org/jira/browse/MNG-5890?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14804491#comment-14804491
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Jordan Zimmerman commented on MNG-5890:
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It could always revert to the same values as "project" in that case.
> 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 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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