maven中导入javax.servlet出现冲突问题

maven中通过插件启动Tomcat报错
报错原因

严重: A child container failed during start
Caused by: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Tomcat].StandardHost[localhost].StandardContext[]]
Caused by: java.lang.ClassCastException: class org.springframework.web.SpringServletContainerInitializer cannot be cast to class javax.servlet.ServletContainerInitializer (org.springframework.web.SpringServletContainerInitializer is in unnamed module of loader org.apache.catalina.loader.WebappClassLoader @1d03917; javax.servlet.ServletContainerInitializer is in unnamed module of loader org.codehaus.plexus.classworlds.realm.ClassRealm @dc4a691)

更改pom.xml中的配置

  <dependency>
           <groupId>javax.servlet</groupId>
           <artifactId>javax.servlet-api</artifactId>
           <version>3.1.0</version>
           <scope>provided</scope>
       </dependency>
       <dependency>
           <groupId>javax.servlet.jsp</groupId>
           <artifactId>javax.servlet.jsp-api</artifactId>
           <version>2.2.1</version>
           <scope>provided</scope>
       </dependency>

需要加<scope>provided</scope>
产生的原因是：tomcat中也有servlet-api包，这样发生了冲突
因为provided表明该包只在编译和测试的时候用，所以，当启动tomcat的时候，就不会冲突了.