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https://issues.apache.org/jira/browse/NIFI-14059?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17903145#comment-17903145
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Ron Ridgely commented on NIFI-14059:
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Screenshot added (some properties blanked before the sreenshot was taken)
The error happens when enabling the service.
It shows up when hovering over the error icon on the far left

> Kafka3ConnectionService : no property for required KerberosUserService
> ----------------------------------------------------------------------
>
>                 Key: NIFI-14059
>                 URL: https://issues.apache.org/jira/browse/NIFI-14059
>             Project: Apache NiFi
>          Issue Type: Bug
>          Components: Core Framework
>    Affects Versions: 2.0.0
>         Environment: Redhat Linux
>            Reporter: Ron Ridgely
>            Priority: Major
>         Attachments: nifi-kafka.jpg
>
>
> The following error prevents successful enabling of the 
> Kafka3ConnectionService:
> Cannot invoke "org.apache.nifi.kerberosUserService.createKerberosUser()" 
> becauseĀ  KerberosUserService is null.
> However, there is no property available to be configured in the processor.



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