<dependency> <groupId>org.ops4j.pax.logging</groupId> <artifactId>pax-logging-log4j1</artifactId> <version>1.11.5</version> </dependency> 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 [%t] %-5p %c %x - %m%n org.ops4j.pax.logging.DefaultServiceLog.level=INFO org.ops4j.pax.logging.DefaultServiceLog.file=log.txt import org.apache.log4j.Logger; public class ExampleClass { private static final Logger logger = Logger.getLogger(ExampleClass.class); public void doSomething(){ logger.debug("This is a debug message"); logger.info("This is an info message"); logger.warn("This is a warning message"); logger.error("This is an error message"); } }