关于Tomcat异常Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContex

在web.xml中

<servlet>
<servlet-name>main</servlet-name>
<servlet-class>web.MainServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>mian</servlet-name>
<url-pattern>*.do</url-pattern>
</servlet-mapping>’

其中 mian 写错了
修改后启动正常