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https://issues.apache.org/jira/browse/NIFI-7055?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17021246#comment-17021246
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Otto Fowler commented on NIFI-7055:
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So, my proposal is to handle String[0] as invalid in a PR for this jira, and to
open a new jira for a new validator that uses String.split(s,-1) which will
return an array sized for how ever many entries there are ( so ",,," returns 3
empty. Thus we will correctly ( in my view ) allow the excludeEmpty and
defined validator do what they are supposed to and not have variable outcomes
based on String.split().
I'll take care of both if it is OK
> 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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