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https://issues.apache.org/jira/browse/NIFI-11743?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Simon Bence closed NIFI-11743.
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> Restrict FlowRegistryClient API to not allow null returns
> ---------------------------------------------------------
>
> Key: NIFI-11743
> URL: https://issues.apache.org/jira/browse/NIFI-11743
> Project: Apache NiFi
> Issue Type: Improvement
> Components: Core Framework
> Reporter: Simon Bence
> Assignee: Simon Bence
> Priority: Minor
> Fix For: 2.0.0
>
> Time Spent: 20m
> Remaining Estimate: 0h
>
> The current definition of FlowRegistryClient allows implementations to return
> with a null value in cases such as list of buckets, flows or versions. In
> practice, this will not happen, but future implementations of changes has
> this option now.
> This is something we want to eliminate both because it is considered as a bad
> pattern and because NiFi expect a valid (but maybe empty) return value. From
> code perspective this will not cause any change, but the document will be
> extended accordingly and will communicate that null is not a valid return
> value.
> Even if this is not a code change and the current registry client behaves in
> this manner, it is considered as a breaking change thus this will be part of
> the 2.x line only.
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