code: 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;
  	}
docs: 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.