in log4j-api-to-jul/src/main/java/org/apache/logging/log4j/tojul/JULLogger.java [169:173]
private boolean isEnabledFor(final Level level, final Marker marker) {
// E.g. we're logging WARN and more, so getLevel() is 300, if we're asked if we're
// enabled for level ERROR which is 200, isLessSpecificThan() tests for >= so return true.
return getLevel().isLessSpecificThan(level);
}