SLF4J and log4j: hello world application

Step 1: Create new maven project ‘slf4j-log4j-demo’.

 

Step 2: Update pom.xml with maven dependencies.

 

pom.xml

<project xmlns="http://maven.apache.org/POM/4.0.0"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>com.sample.app</groupId>
    <artifactId>slf4j-log4j-demo</artifactId>
    <version>1</version>

    <dependencies>

        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-log4j12</artifactId>
            <version>1.7.31</version>
        </dependency>
        
    </dependencies>
</project>

 

Step 3: Create log4j.properties file under src/main/resources folder.

 

log4j.properties

log4j.rootLogger=DEBUG,stdout

log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%p\t%d{ISO8601}\t%r\t%c\t[%t]\t%m%n

 

Step 4: Define HelloWorld.java application.

 

HelloWorld.java

package com.sample.app;

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

public class HelloWorld {

    public static void main(String args[]) {
        Logger logger = LoggerFactory.getLogger(HelloWorld.class);

        logger.info("Welcome to SLF4J logging");
    }

}

 

Output

INFO    2021-07-05 11:08:27,768 0   com.sample.app.HelloWorld   [main]  Welcome to SLF4J logging

 

You can download complete working application from below link.

https://github.com/harikrishna553/java-libs/tree/master/slf4j/slf4j-log4j-demo

 

 

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