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https://issues.apache.org/jira/browse/NIFIREG-347?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16995028#comment-16995028
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Shawn Weeks commented on NIFIREG-347:
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This also happens if you have nested processor groups and they all need to
access the same parameter context. It appears that nested process groups don't
inherit parameter contexts like variables did.
> Duplicate key error when commiting flow with shared parameter context
> ---------------------------------------------------------------------
>
> Key: NIFIREG-347
> URL: https://issues.apache.org/jira/browse/NIFIREG-347
> Project: NiFi Registry
> Issue Type: Bug
> Affects Versions: 0.5.0
> Environment: Linux
> Reporter: Geir Klingenberg
> Priority: Major
>
> When commiting a flow that have multiple process groups that share the same
> parameter context, Nifi Registry reports the following error:
> Duplicate key org.apache.nifi.registry.flow.VersionedParameterContext@1661e4cf
> A simple flow to reproduce this: Add one root process group, add two process
> groups (A and B) within the root group. Create a parameter context and assign
> that context to group A and B. Checking in the root group to nifi-registry
> gives the above error message.
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