How to get SLF4J “Hello World” working with log4j?

Question

The \"Hello World\" example from SLF4J is not working for me. I guess this is because I added slf4j-log4 to my classpath. Should I configure log4j directly for the hello wor

Answer 1

Here a working example to use slf4j as façade with log4j in the backend:

pom.xml

    4.0.0
    xxx
    xxx
    0.0.1-SNAPSHOT

    
        
        
            org.slf4j
            slf4j-api
            1.7.30
        
        
        
            org.slf4j
            slf4j-log4j12
            1.7.30
        
        
        
            org.apache.logging.log4j
            log4j-core
            2.13.3
        
    

src/main/resources/log4j.properties

# Root logger option
log4j.rootLogger=DEBUG, stdout

# Direct log messages to stdout
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.Target=System.out
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss} %-5p %c{1}:%L - %m%n

src/main/java/Main.java

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

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

    /**
     * Default private constructor.
     */
    private Main() {
    }

    /**
     * Main method.
     *
     * @param args Arguments passed to the execution of the application
     */
    public static void main(final String[] args) {
        logger.info("Message to log");
    }
}