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求助：spring· boot 使用log4j报错，去除重复就报以下错误，不去重就提示包重复，tomcat也起不来

qq_33279764 2019-05-07 11:12:38

log4j:WARN No appenders could be found for logger (org.springframework.web.context.support.StandardServletEnvironment).

log4j:WARN Please initialize the log4j system properly.

log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.



  .   ____          _            __ _ _

 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \

( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \

 \\/  ___)| |_)| | | | | || (_| |  ) ) ) )

  '  |____| .__|_| |_|_| |_\__, | / / / /

 =========|_|==============|___/=/_/_/_/

 :: Spring Boot ::       (v1.5.10.RELEASE)



[2019-05-07 22:53:30.924] - 13452 信息 [main] --- org.apache.catalina.core.StandardService: Starting service [Tomcat]

[2019-05-07 22:53:30.928] - 13452 信息 [main] --- org.apache.catalina.core.StandardEngine: Starting Servlet Engine: Apache Tomcat/8.5.27

[2019-05-07 22:53:31.104] - 13452 信息 [localhost-startStop-1] --- org.apache.catalina.core.ContainerBase.[Tomcat].[localhost].[/]: Initializing Spring embedded WebApplicationContext

[2019-05-07 22:53:31.617] - 13452 信息 [main] --- org.apache.catalina.core.StandardService: Stopping service [Tomcat]

去除包操作为

<dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-web</artifactId>

            <exclusions>

                <exclusion>

                    <artifactId>logback-classic</artifactId>

                    <groupId>ch.qos.logback</groupId>

                </exclusion>

                <exclusion>

                    <artifactId>log4j-over-slf4j</artifactId>

                    <groupId>org.slf4j</groupId>

                </exclusion>

            </exclusions>

        </dependency>

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