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 %p [%c] - %m%n import org.apache.log4j.Logger; public class MyClass { private static final Logger logger = Logger.getLogger(MyClass.class); public static void main(String[] args) { logger.debug("Debug log"); logger.info("Info log"); logger.warn("Warning log"); logger.error("Error log"); } } if(logger.isDebugEnabled()) { logger.debug("Debug log"); } logger.debug("User {0} logged in from {1}.", username, ipAddress); log4j.rootLogger=DEBUG, asyncConsole log4j.appender.asyncConsole=org.apache.log4j.AsyncAppender log4j.appender.asyncConsole.appenderRef.console.ref=log4j.appender.console log4j.appender.file=org.apache.log4j.FileAppender log4j.appender.file.File=/path/to/log/file.log log4j.appender.file.layout=org.apache.log4j.PatternLayout log4j.appender.file.layout.ConversionPattern=%d %p [%c] - %m%n log4j.appender.file=org.apache.log4j.RollingFileAppender log4j.appender.file.File=/path/to/log/file.log log4j.appender.file.MaxFileSize=10MB log4j.appender.file.MaxBackupIndex=5 log4j.appender.file.layout=org.apache.log4j.PatternLayout log4j.appender.file.layout.ConversionPattern=%d %p [%c] - %m%n log4j.logger.com.example=INFO, console log4j.logger.com.example.dao=DEBUG, file