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https://issues.apache.org/jira/browse/NIFI-4936?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16395277#comment-16395277
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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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