# Global logging configuration log4j.rootLogger=INFO, CONSOLE # Console output configuration 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 # Log level for specific packages log4j.logger.com.example.package1=DEBUG log4j.logger.com.example.package2=ERROR import org.apache.log4j.Logger; public class MyClass { private static final Logger logger = Logger.getLogger(MyClass.class); public void myMethod() { logger.debug("Debug message."); logger.info("Info message."); logger.error("Error message."); } }