import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; public class MyClass { private static final Log logger = LogFactory.getLog(MyClass.class); public void doSomething() { logger.debug("Doing something..."); logger.error("An error occurred."); } } log4j.rootLogger=DEBUG, console log4j.appender.console=org.apache.log4j.ConsoleAppender log4j.appender.console.layout=org.apache.log4j.PatternLayout log4j.appender.console.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss} %-5p [%t] %c{1}:%L - %m%n