ASF GitHub Bot commented on NIFI-4936:

GitHub user joewitt opened a pull request:


    NIFI-4936 pushed down version declarations to lowest appropriate level

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You can merge this pull request into a Git repository by running:

    $ git pull https://github.com/joewitt/incubator-nifi NIFI-4936

Alternatively you can review and apply these changes as the patch at:


To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

    This closes #2512
commit 2029a04d75b8fc14fef5e6d2f2c49fc56d70cde2
Author: joewitt <joewitt@...>
Date:   2018-03-06T04:53:36Z

    NIFI-4936 pushed down version declarations to lowest appropriate level


> NiFi parent pom dependency management forcing versions to align defeating 
> classloader isolation
> -----------------------------------------------------------------------------------------------
>                 Key: NIFI-4936
>                 URL: https://issues.apache.org/jira/browse/NIFI-4936
>             Project: Apache NiFi
>          Issue Type: Bug
>          Components: Core Framework, Extensions, Tools and Build
>    Affects Versions: 1.1.0, 1.2.0, 1.0.1, 1.3.0, 1.4.0, 1.5.0
>            Reporter: Joseph Witt
>            Assignee: Joseph Witt
>            Priority: Major
>             Fix For: 1.6.0
>         Attachments: NIFI-4936.patch, build-fixing, 
> old-vs-new-dependencies.txt
> the top level pom in nifi has a massive dependency management section.  this 
> was used initially to help enforce consistent usage of dependencies across 
> nifi but this also can defeat the purpose of the classloader isolation 
> offered by nars.  We need to push down dependency version declarations to the 
> nar levels where appropriate.
> there have been reported issues of defects happening due to us using much 
> newer versions (or sometimes older) of dependencies due to this dependency 
> management model.  By pushing declarations down to the proper scope each 
> nar/etc.. can use the specific versions of components it needs and we'll stop 
> introducing issues by forcing a different version.

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