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This tutorial shows how to use SLF4J with Log4j.
Changes are only needed in pom.xml. (add Log4j dependencies, exclude default logging from every Spring Boot Starter)
Application Schema [Results]
Spring Boot Starters
GROUP
DEPENDENCY
DESCRIPTION
Web
Spring Web
Enables: @RequestMapping, Tomcat Server
hello()
MyController
http://localhost:8080/Hello
Tomcat
Browser
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Create Project: springboot_log (add Spring Boot Starters from the table)
Edit File: pom.xml (add Log4j dependencies, exclude default logging from every Starter)
Create Package: controllers (inside main package)
– Create Class: MyController.java (inside controllers package)
pom.xml
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
<exclusions>
<exclusion>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-logging</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-log4j2</artifactId>
</dependency>
</dependencies>
MyController.java
package com.ivoronline.springboot_log_log4j.controllers;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.RequestMapping;
@Controller
public class MyController {
private static final Logger log = LoggerFactory.getLogger(MyController.class);
@ResponseBody
@RequestMapping("/Hello")
public String hello() {
log.info("Hello from Controller");
return "Hello from Controller";
}
}
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http://localhost:8080/Hello
Console
2021-03-16 08:59:53.267 INFO 14180 - [nio-8080-exec-2] c.i.s.controllers.MyController : Hello from Controller
Application Structure
pom.xml
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
<exclusions>
<exclusion>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-logging</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-log4j2</artifactId>
</dependency>
</dependencies>
