Decrease

SLF4J: Class path contains multiple SLF4J bindingsSpring Boot.
SLF4J: Found binding in [jar:file:/C:/Users/168/.m2/repository/ch/qos/logback/logback-classic/1.2.3/logback-classic-1.2.3.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/C:/Users/168/.m2/repository/org/apache/logging/log4j/log4j-slf4j-impl/2.11.1/log4j-slf4j-impl-2.11.1.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation.
Failed to instantiate SLF4J LoggerFactory

Spring Boot
spring-boot-starter-logging預設為logback，同時又加入log4j2依賴，導致兩個日誌框架異常
SLF4J: Class path contains multiple SLF4J bindings.訊息。

在配置中使用log4j2就要排除spring-boot-starter-logging的依賴。
1.Maven-pom.xml
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
            <exclusions>
                <!--排除spring-boot-starter-logging-->
                <exclusion>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-starter-logging</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <!--log4j2-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-log4j2</artifactId>
        </dependency>
    </dependencies>
2.Gradle-build.gradle
dependencies {
 implementation ('org.springframework.boot:spring-boot-starter'){
  exclude group: 'org.springframework.boot', module: 'spring-boot-starter-logging'
 }
 implementation 'org.springframework.boot:spring-boot-starter-log4j2'
}