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https://issues.apache.org/jira/browse/NIFI-7055?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17021149#comment-17021149
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Joe Witt commented on NIFI-7055:
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To my mind someone entering just ',' for a field that takes a comma separated
list and the list is expected to have at least one thing - shoudl be invalid.
So the fix as you suggest seems totally fine.
> createListValidator returns valid for empty list with "," input
> ---------------------------------------------------------------
>
> Key: NIFI-7055
> URL: https://issues.apache.org/jira/browse/NIFI-7055
> Project: Apache NiFi
> Issue Type: Bug
> Reporter: Otto Fowler
> Assignee: Otto Fowler
> Priority: Major
>
> from Slack:
> <[email protected]>
> "I'm looking at the createListValidator, and to my surprise passing in a list
> of (essentially) two empty elements "," validates, while a totally empty
> string "" does not. Apparently due to some underlying behavior of
> String.split."
> The string "," does return a String[0] from split. This should fail
> validation as if here were no elements as null, "", " " do possibly.
> But that kind of goes against or doesn't consider the ignore empty entries.
> I think the difference is whether or not you consider "," to be a list of two
> empty elements or an empty list.
> The current implementation with String.spilt() will produce an empty list.
> Is that correct?
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