[paulmd]

You're quite simply wrong - the docs do not say that anywhere.

What they do say is that you are not allowed to route loggers circularly - if you route (for example) JUL through SLF4J, you are not allowed to route that output back to JUL, otherwise messages would never be dumped to output.

[puppetmaster3]

That's why I said that you have not used it in anger in production environments. Anyway, good luck.