Maven : Log4j2 could not find a logging implementation

1.美图

3.错误信息

Log4j2 could not find a logging implementation. Please add log4j-core to the classpath

解决办法:
pom把log4j-api也加进去

<dependency>
     <groupId>org.apache.logging.log4j</groupId>
     <artifactId>log4j-core</artifactId>
     <version>2.9.1</version>
 </dependency>
 <dependency>
     <groupId>org.apache.logging.log4j</groupId>
     <artifactId>log4j-api</artifactId>
     <version>2.9.1</version>
 </dependency>