Slf4j: logback: hello world application

Step 1: Create new maven project ‘slf4j-logback-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-logback-demo</artifactId>
	<version>1</version>

	<dependencies>

		<dependency>
			<groupId>ch.qos.logback</groupId>
			<artifactId>logback-classic</artifactId>
			<version>1.2.3</version>
		</dependency>

	</dependencies>
</project>

Step 3: Create logback.xml file under src/main/resources folder.

 

logback.xml

<?xml version="1.0" encoding="UTF-8"?>

<configuration>

  <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
    <encoder>
      <pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n</pattern>
    </encoder>
  </appender>

  <root level="debug">
    <appender-ref ref="STDOUT" />
  </root>
</configuration>

Step 4: Define hello world application class.

 

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");
	}

}

Total project structure looks like below.

Run HelloWorld.java file, you will see below messages in console.

11:57:50.715 [main] INFO  com.sample.app.HelloWorld - Welcome to SLF4J logging

 

You can download complete working application from below link.

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

 

 

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