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From "Christian Schulte (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MNG-5971) Dependency management in a child project cannot override a version using a BOM
Date Tue, 02 Feb 2016 15:49:39 GMT

    [ https://issues.apache.org/jira/browse/MNG-5971?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15128426#comment-15128426
] 

Christian Schulte commented on MNG-5971:
----------------------------------------

Imports never overwrite anything already present in the model. See [DefaultDependencyManagementImporter|https://git-wip-us.apache.org/repos/asf?p=maven.git;a=blob;f=maven-model-builder/src/main/java/org/apache/maven/model/composition/DefaultDependencyManagementImporter.java;h=d895913eb6b665193da46e965f48f7fffefcde1c;hb=HEAD]
for how the import is implemented. You want the BOM to always overwrite what is already there.
Others want to overwrite what is in the BOM. Regarding the example, just do not put things
you want to import into the pom as that will overwrite what gets imported.

> 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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