static void configureViaXML_File() {
LoggerContext lc = (LoggerContext) LoggerFactory.getILoggerFactory();
try {
JoranConfigurator configurator = new JoranConfigurator();
configurator.setContext(lc);
lc.stop();
URL url = Loader.getResourceBySelfClassLoader("chapter7/simpleMDC.xml");
configurator.doConfigure(url);
} catch (JoranException je) {
StatusPrinter.print(lc);
}