Github user pvillard31 commented on the issue:
https://github.com/apache/nifi/pull/1148
Hi @mauriziocolleluori,
If you still encounter issues in UI when testing properties while using
expression language, please check that nifi.kerberos.krb5.file is correctly set
in your nifi.properties file (and reference a readable file).
In addition, it would be great to do the same kind of modification in Kafka
processors where Kerberos principal is also a property. Let me know if you are
OK to do it, otherwise, I'll do it. Thanks!
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