<parent><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>2.0.2.RELEASE</version>
</parent><properties><project.build.sourceEncoding>UTF-8</project.build.sourceEncoding><project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding><java.version>1.8</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>
</dependencies>

<?xml version="1.0" encoding="UTF-8"?>
<Configuration status="WARN" monitorInterval="30"><Properties><Property name="LOG_PATTERN">%d{yyyy-MM-dd'T'HH:mm:ss.SSSZ} %p %m%n</Property><Property name="APP_LOG_ROOT">c:/temp</Property></Properties><Appenders><Console name="Console" target="SYSTEM_OUT" follow="true"><PatternLayout pattern="${LOG_PATTERN}" /></Console><RollingFile name="appLog"fileName="${APP_LOG_ROOT}/SpringBoot2App/application.log"filePattern="${APP_LOG_ROOT}/SpringBoot2App/application-%d{yyyy-MM-dd}-%i.log"><PatternLayout pattern="${LOG_PATTERN}" /><Policies><SizeBasedTriggeringPolicy size="19500KB" /></Policies><DefaultRolloverStrategy max="1" /></RollingFile></Appenders><Loggers><Logger name="com.howtodoinjava.app" additivity="false"><AppenderRef ref="appLog" /><AppenderRef ref="Console" /></Logger><Root level="debug"><AppenderRef ref="Console" /></Root></Loggers>
</Configuration>

package com.howtodoinjava.app;import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.web.servlet.support.SpringBootServletInitializer;
import org.springframework.context.ApplicationContext;@SpringBootApplication
public class Application extends SpringBootServletInitializer {private static final Logger LOGGER = LogManager.getLogger(Application.class);public static void main(String[] args){ApplicationContext ctx = SpringApplication.run(Application.class, args);LOGGER.info("Info level log message");LOGGER.debug("Debug level log message");LOGGER.error("Error level log message");}
}