[NIFI-7055] createListValidator returns valid for empty list with "," input

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 1.12.0
• Assignee: Otto Fowler
• Reporter: Otto Fowler
• Created: 22/Jan/20 14:39
• Updated: 16/Mar/20 17:07
• Resolved: 05/Mar/20 10:02

Description

from Slack:
<[e-mail]>
"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?

Issue Links

• is related to: NIFI-7063 version of createListValidator that ensures validator called
• is related to: NIFI-7109 Unit tests should be able to determine if item validator was called
• links to: GitHub Pull Request #4012
• links to: GitHub Pull Request #4114