Logger logger = Logger.getLogger(MyClass.class.getName()); # Log level log4j.rootLogger=INFO # Console appender configuration log4j.appender.console=org.apache.log4j.ConsoleAppender log4j.appender.console.layout=org.apache.log4j.PatternLayout log4j.appender.console.layout.ConversionPattern=%d [%t] %p %c - %m%n # File appender configuration log4j.appender.file=org.apache.log4j.FileAppender log4j.appender.file.layout=org.apache.log4j.PatternLayout log4j.appender.file.layout.ConversionPattern=%d [%t] %p %c - %m%n log4j.appender.file.File=/var/log/myapp.log # Logger configuration log4j.logger.com.mycompany.myapp=INFO, console, file logger.info("This is an informational message."); logger.warn("This is a warning message."); logger.error("An error occurred during processing.");