Is recomended see this link.
Add this exclusion to the following packages (the dependencies you have)
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-actuator</artifactId>
<exclusions>
<exclusion>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-logging</artifactId>
</exclusion>
</exclusions>
</dependency>
This dependencies are new
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-log4j2</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-webflux</artifactId>
</dependency>
<dependency>
<groupId>com.google.code.gson</groupId>
<artifactId>gson</artifactId>
<version>2.9.0</version>
</dependency>
<dependency>
<groupId>org.junit.jupiter</groupId>
<artifactId>junit-jupiter</artifactId>
<version>5.8.2</version>
<scope>test</scope>
</dependency>
Create the web.xml file at webapp\WEB-INF, create webapp folder under src\main
This is a web.xml example
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="3.1" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd">
<context-param>
<param-name>isLog4jAutoInitializationDisabled</param-name>
<param-value>true</param-value>
</context-param>
<context-param>
<param-name>log4jContextName</param-name>
<param-value>exampleLogFolderName</param-value>
</context-param>
<session-config>
<session-timeout>
30
</session-timeout>
</session-config>
<welcome-file-list>
<welcome-file>swagger-ui.html#</welcome-file>
</welcome-file-list>
</web-app>
Below resource generate the log4j2.xml file
Here's a example file
<?xml version="1.0" encoding="UTF-8"?>
<Configuration status="WARN" monitorInterval="30">
<Properties>
<Property name="LOG_PATTERN">
%d{yyyy-MM-dd HH:mm:ss.SSS} %5p ${hostName} --- [%15.15t] %-40.40c{1.} : %m%n%ex
</Property>
</Properties>
<Appenders>
<Console name="ConsoleAppender" target="SYSTEM_OUT" follow="true">
<PatternLayout pattern="${LOG_PATTERN}"/>
</Console>
<RollingFile name="FileAppender" fileName="logs/testProject/log4j2-.log"
filePattern="logs/test/log4j2-%d{yyyy-MM-dd}-%i.log">
<PatternLayout>
<Pattern>${LOG_PATTERN}</Pattern>
</PatternLayout>
<Policies>
<SizeBasedTriggeringPolicy size="3MB" />
</Policies>
<DefaultRolloverStrategy max="30"/>
</RollingFile>
</Appenders>
<Loggers>
<Logger name="com.test.TestProject" level="debug" additivity="false">
<AppenderRef ref="ConsoleAppender"/>
<AppenderRef ref="FileAppender"/>
</Logger>
<Root level="info">
<AppenderRef ref="ConsoleAppender"/>
<AppenderRef ref="FileAppender"/>
</Root>
</Loggers>
</Configuration>
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