Question

I am learning log4j. But, I get this error not sure if I’m missing something. I have all the jars in place.

public class LoggingDemo {
    private static final Logger logger = LoggerFactory.getLogger(LoggingDemo.class);

    public static void main(String[] args) {
        logger.info("Starting App....");
        System.out.println("Testing log4j.......");
        logger.info("Terminating App!");
    }

}

Answer 1

I get this all the time when I am creating a new project. You need to create a log4j.properties file and add it to your class path. See the Configuration section of the manual http://logging.apache.org/log4j/1.2/manual.html

Or just change your code to:

public class LoggingDemo {
    private static final Logger logger = LoggerFactory.getLogger(LoggingDemo.class);

    public static void main(String[] args) {
        BasicConfigurator.configure();
        logger.info("Starting App....");
        System.out.println("Testing log4j.......");
        logger.info("Terminating App!");
    }

}