Joseph Witt commented on NIFI-4936:

[~JPercivall] I think it is worth mentioning in the migration guide.  I'll add 
the flag/label to this JIRA.

> 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: Matt Gilman
>            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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