MDC.put("first", "Dorothy");
// Configure logback
PatternLayout layout = new PatternLayout();
layout.setPattern("%X{first} %X{last} - %m%n");
layout.start();
ConsoleAppender appender = new ConsoleAppender();
appender.setLayout(layout);
appender.start();
Logger root = (Logger)LoggerFactory.getLogger("root");
root.addAppender(appender);