exceptionfactory commented on pull request #5061:
URL: https://github.com/apache/nifi/pull/5061#issuecomment-867088252


   When attempting to verify the most recent updates at runtime, the `ListSFTP` 
worked as expected with the default blank values for the new properties.  
However, when specifying a value for `Ciphers Allowed`, NiFi marked the 
processor as invalid with the following message:
   
   `'Ciphers Allowed' validated against 'aes256-cbc' is invalid because 
'Ciphers Allowed' is not supported or has no Validator associated with it.`
   
   It appears that recent updates to remove the default values also removed any 
kind of validator, but I missed that detail last time around.  Based on 
previous comments and support for Expression Language, it seems like using 
StandardValidators.NON_EMPTY_EL_VALIDATOR would be a good option.


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