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https://issues.apache.org/jira/browse/NIFI-5684?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16646610#comment-16646610
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Otto Fowler commented on NIFI-5684:
-----------------------------------
errors in the use that 'bracket' the value can help with this as well.
value
vs
[ value ]
> Add a Warning / Indicator in the UI if a property value begins or ends with
> white space
> ---------------------------------------------------------------------------------------
>
> Key: NIFI-5684
> URL: https://issues.apache.org/jira/browse/NIFI-5684
> Project: Apache NiFi
> Issue Type: Improvement
> Components: Core UI
> Reporter: Mark Payne
> Priority: Major
>
> It is not uncommon to see a user enter a property value into the UI where the
> property value begins or ends with whitespace (both trailing spaces and
> trailing newlines are fairly common to see), especially when they copy &
> paste the value in. NiFi does not trim whitespace because there are also very
> valid use cases for having the white space there (for example, if the
> property value is used as a prefix for some string, or as a delimiter).
> However, when this happens, users often end up with errors that say something
> like "User my-user-name does not exist" because the property value is set to
> "my-user-name<space>" and the error message leads the user astray, leading to
> a lot of confusion.
> Therefore, I propose adding an indicator to the UI, so that when a user
> configures a property value that begins with or ends with white space, the UI
> warns to this fact so that the user is able to detect and fix this easily,
> avoiding the confusion described above.
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