reactor-core/src/main/java/reactor/util/Loggers.java
public static final void useJdkLoggers() {
		String name = LoggerFactory.class.getName();
		LoggerFactory loggerFactory = new JdkLoggerFactory();
		loggerFactory.getLogger(name).debug("Using JDK logging framework");
		LOGGER_FACTORY = loggerFactory;
	}
public static final void useJdkLoggers() {
		String name = LoggerFactory.class.getName();
		LoggerFactory loggerFactory = new JdkLoggerFactory();
		loggerFactory.getLogger(name).debug("Using JDK logging framework");
		LOGGER_FACTORY = loggerFactory;
	}
Force the usage of JDK-based {@link Logger Loggers}, even if SLF4J is available
on the classpath.
<p>
The previously active logger factory is simply replaced without
any particular clean-up.