Log4j2 Tutorial 5 – XML Configuration File to Log Into File and Console Using Log4j2 Together

We have already learnt the basics but important concepts of Log4j2 in series of tutorials in Log4j2 Tutorials. Now we know to create an XML configuration file to print logs in to a File and on to the console.

But sometimes it is good to print logs in to console and file as well. So now we will configure an XML document that will be capable to print logs into a file and on a console as well.

If you are thinking it will be complex then you are not correct. It will be just a combination of above mentioned two posts.

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Always use the latest version of dependencies. I am using the below version of Log4j2 which is the latest at the time of writing this post.

  org.apache.logging.log4j log4j-core 2.14.1

We know that to print in to console we need to use console appender and File appender to print logs in to a file. We can use both into same configuration file as below:-


    %d{HH:mm:ss.SSS} [%t] %-5level %logger{36} - %msg%n

package appCode;

import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;

public class ModuleA {
        
        // Creating a logger
        private static Logger logger = LogManager.getLogger();

        // Log messages
        public static void main(String[] args) {
                
                logger.debug("It is a debug logger.");
                logger.error("It is an error logger.");
                logger.fatal("It is a fatal logger.");
                logger.info("It is a info logger.");
                logger.trace("It is a trace logger.");
                logger.warn("It is a warn logger.");
                
        }
}

When we run above program then we can see logs printed in console and file both as below:-

2021-04-13 07:41:54,448 [main] DEBUG: It is a debug logger.
2021-04-13 07:41:54,451 [main] ERROR: It is an error logger.
2021-04-13 07:41:54,453 [main] FATAL: It is a fatal logger.
2021-04-13 07:41:54,454 [main] INFO : It is a info logger.
2021-04-13 07:41:54,454 [main] TRACE: It is a trace logger.
2021-04-13 07:41:54,455 [main] WARN : It is a warn logger.

Log4j2 Example Codes

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