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https://issues.apache.org/jira/browse/NIFI-7055?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17021227#comment-17021227
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Otto Fowler commented on NIFI-7055:
-----------------------------------
OK. This is the way it currently works without my change to handle String[0]:
||INPUT STRING||VALIDATOR ACTIONS||RESULT||
|","|String[0] no validator called| valid|
|",,,,,"|String[0] no validator called | valid |
|",foo"|validator called for empty and for foo| invalid|
|"foo,"|validator for foo, trailing empty not returned from split| valid|
I am not sure this is right. It is certainly not consistent. I would think we
would want the validator to be called based on exclude empty in all cases, not
dependent on the string.split workings.
String.split(string, -1) will always return the list sized to the input with
empties.... but that breaks the existing behavior for "foo," where we expect it
to be ignored.
I am not sure how to handle all these cases without regression.
Maybe the fix is to handle String[0], leave the rest as is, and create a new
validator that uses split -1?
[~joewitt]? [~woutifier]?
> 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:
> <wouter.devr...@tesorion.nl>
> "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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