How to specify own logging file while using spring boot with lombok - spring-boot

Question

I am aware that some logging configuration can be specified in application.properties file. But I am interested in separating logging configuration from application configuration for obvious reasons and would prefer to use own logging file. I tried log4j2.properties, but spring boot seems to not detect it. Below is how my code and pom.xml is. Could someone suggest how to setup log4j2.properties when using with lombok.
<?xml version="1.0" encoding="UTF-8"?>
<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>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.5.0</version>
<relativePath /> <!-- lookup parent from repository -->
</parent>
<groupId>com.example</groupId>
<artifactId>LoggingWithLombak</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>LoggingWithLombak</name>
<description>Demo project for Logging With Lombak</description>
<properties>
<java.version>11</java.version>
</properties>
<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>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<scope>runtime</scope>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<configuration>
<excludes>
<exclude>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
</exclude>
</excludes>
</configuration>
</plugin>
</plugins>
</build>
</project>
and
package com.example.demo;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import lombok.extern.log4j.Log4j2;
import lombok.extern.slf4j.Slf4j;
#Slf4j
//#Log4j2
#SpringBootApplication
public class LoggingWithLombakApplication {
public static void main(String[] args) {
log.trace("some trace logging...");
log.debug("some debug logging...");
log.info("some info logging...");
log.warn("some warn logging...");
log.error("some error logging...");
log.info("log.getClass(): " + log.getClass());
SpringApplication.run(LoggingWithLombakApplication.class, args);
}
}
and adding below in log4j2.properties has no effect.
logging.level.org=WARN
logging.level.com.example.demo=ERROR

Answer 1

You should add the properties to file application.properties instead of log4j2.properties.
If you want more complex log4j2 configuration, use file log4j2-spring.xml or log4j2.xml.
Spring boot log level
Spring boot custom log configuration