import org.apache.logging.log4j.LogManager; import org.apache.logging.log4j.Logger; public class YourTestClass { private static final Logger logger = LogManager.getLogger(YourTestClass.class); public static void main(String[] args) { // Log a message logger.info("This is an informational message."); // Log an error logger.error("An error occurred.", new Exception("Sample exception")); // Log a warning logger.warn("This is a warning message."); } }