Github user alopresto commented on the issue:
https://github.com/apache/nifi/pull/1238
@jtstorck and I resolved the logging issue. Because the Zookeeper migrator
has an explicit dependency on `log4j` instead of `slf4j`, `log4j` was competing
with the existing `logback` implementation that was already present in the
`lib/`. I switched the `TestAppender` implementation in
`ConfigEncryptionToolTest` to extend `log4j`'s `AppenderSkeleton` instead of
`logback`'s `AppenderBase<LoggingEvent>` and updated a couple tests. Now the
tests run properly in both an IDE and Maven, and all the tools (TLS, ZK, and
EC) run properly (print expected output to console and do not warn about
multiple available logging implementations).
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