Logger logger = LoggerFactory.getLogger(MyClass.class); logger.setFormat("%d{HH:mm:ss.SSS} [%t] %-5level %logger{36} - %msg%n"); logger.setLevel(Level.INFO); LoggerContext context = (LoggerContext) LoggerFactory.getILoggerFactory(); context.stop(); AsyncAppender asyncAppender = new AsyncAppender(); asyncAppender.addAppender(consoleAppender); asyncAppender.start(); Logger logger = LoggerFactory.getLogger(MyClass.class); logger.addAppender(asyncAppender); context.start(); Logger logger = LoggerFactory.getLogger(MyClass.class); logger.setLevel(Level.INFO);