How to disable JooQ’s self-ad message in 3.4+?

This seems to work for me:

static {
    LogManager.getLogManager().reset();
}

This is also indicated as a solution a couple of times in this Stack Overflow question.

Note that version 3.6+ will also ship with a system property that can be used to deactivate displaying this logo:

-Dorg.jooq.no-logo=true