Github user olegz commented on the pull request:
https://github.com/apache/nifi/pull/285#issuecomment-205353808
They were logged at DEBUG only level and that was the issue since you would
not be able to see them, but now if there is an error the stack trace will be
printed
---
If your project is set up for it, you can reply to this email and have your
reply appear on GitHub as well. If your project does not have this feature
enabled and wishes so, or if the feature is enabled but not working, please
contact infrastructure at [email protected] or file a JIRA ticket
with INFRA.
---