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https://issues.apache.org/jira/browse/NIFI-9336?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Rob Moran updated NIFI-9336:
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Attachment: whitespace-awareness.png
> When configuring component properties, UI should flag/make obvious when there
> is whitespace
> -------------------------------------------------------------------------------------------
>
> Key: NIFI-9336
> URL: https://issues.apache.org/jira/browse/NIFI-9336
> Project: Apache NiFi
> Issue Type: Bug
> Components: Core UI
> Reporter: Mark Payne
> Assignee: M Tien
> Priority: Major
> Attachments: whitespace-awareness.png
>
>
> It is a very common problem that users will copy & paste values into the
> property configuration for a processor/controller service/etc. And this often
> results in unwanted white space at the beginning or end of the property value
> (especially the end). This can have very confusing results, like indicating
> that a hostname cannot be found or that credentials are invalid, etc. but the
> issue is not obvious when an error message looks like:
> {{No route to host: 1.1.1.1}}
> At the same time, we cannot simply have NiFi trim all property values,
> because sometimes white space is important. For example, Merge Content allows
> a header/footer/demarcator which may well intentionally include whitespace.
> While we could add an indicator to Property Descriptors to address this
> issue, such as:
> {{.trimWhiteSpace(true)}}
> it will be easy to forget adding that to the Property Descriptor, and if we
> default it to true, it would change behavior of many processors unexpectedly.
> Since we cannot trim the values automatically, the UI should flag this when
> configuring property values, making it very clear that there is leading or
> trailing whitespace.
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