Github user bbende commented on the issue:
https://github.com/apache/nifi/pull/843
@YolandaMDavis Thanks for reviewing and testing! After looking at the
existing EL validator in StandardValidators, it wasn't used by any processor
and I believe the logic didn't fully make sense. It was saying "if a property
supports EL and EL is present, return true" but this doesn't mean the EL was
valid.
So I replaced it with the logic from the validator in the abstract hadoop
processor which I believe is correct... "if EL is supported and EL is present,
check if all expressions are valid and return true if they are, otherwise
return the message about what wasn't valid. If EL is not supported, or if EL is
not present, return true"
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