Github user afs commented on the issue:
https://github.com/apache/jena/pull/439
This is a direct fix of the problem. While the JUL support isn't used by
Jena itself, I have used it elsewhere for simple logging for testing and for
servers.
For more controlled logging, a specific package would be used to provide
the slf4j implementation for Jena to see if, long term, it can be a simple
default for Jena, dropping the now discontinued log4j in cases where Jena needs
an output channel.---
