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From "Christian Schulte (JIRA)" <>
Subject [jira] [Commented] (MNG-5971) Imported dependencies should be available to inheritance processing
Date Thu, 18 Feb 2016 19:18:18 GMT


Christian Schulte commented on MNG-5971:

It's a technical restriction. The very purpose of the {{include}} scope is to be processed
before inheritance. This is what this issue is about. The {{import}} scope is implemented
in a way that it is one of the last steps involved during model building. After inheritance
processing, property substitution, path normalisation etc. (when the model already is completely
built). That's what has lead to this issue and that's why you can use properties for the {{import}}
scope. For the {{include}} scope, the following currently would not be possible.


The values for these properties need to be available during reading the model before any further
processing takes place. If it will be released that way, it will not take long until the first
issue is filed stating that is a bug. I haven't found a way to make that work without breaking
the very purpose of the {{include}} scope yet. Building the complete model once to remember
the values to be used for the {{include}} scope to then start the model building over again
with those values may be solution. Inheritance processing would need to be re-implemented
to support only processing properties.

> Imported dependencies should be available to inheritance processing
> -------------------------------------------------------------------
>                 Key: MNG-5971
>                 URL:
>             Project: Maven
>          Issue Type: Wish
>          Components: Dependencies
>    Affects Versions: 3.3.3
>            Reporter: Stephane Nicoll
>            Priority: Trivial
> 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:
> 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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