[jira] [Created] (MNG-5971) Dependency management in a child project cannot override a version using a BOM

["Stephane Nicoll (JIRA)" <ji...@apache.org>]

Stephane Nicoll created MNG-5971:
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             Summary: Dependency management in a child project cannot override a version using a BOM
                 Key: MNG-5971
                 URL: https://issues.apache.org/jira/browse/MNG-5971
             Project: Maven
          Issue Type: Bug
          Components: Dependencies
    Affects Versions: 3.3.3
            Reporter: Stephane Nicoll


When a project extends from a parent with a {{dependencyManagement}} section, it is not always possible to properly override (and align) the version to use for a group of dependencies.

We typically use Bill Of Materials to gather a group of modules and make sure their versions are consistent. 

The following project demonstrates the issue: https://github.com/snicoll-scratches/maven-dependency-management

The first commit is a working use case where the parent uses a bom with version A and we use the same bom with version B in the child. Version B is used as expected.

The second commit demonstrates the faulty scenario. Rather than using a bom in the parent, we use a direct dependency (provided by that bom). We still use the bom with a different version. In that case all the dependencies but the one provided by the parent are overridden (leading to mixed versions for the dependencies provided by the BOM).

It looks like the distance is still used to compute the version while the graph of dependencies should be flatten at each step for a proper override. 

Thoughts? Thanks!



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