Eclipse中部署项目时，Tomcat启动报错 “Failed to start component“

    你修改了tomcat的server.xml文件，如下

 <Host appBase="webapps" autoDeploy="true" name="localhost" unpackWARs="true">

        <!-- SingleSignOn valve, share authentication between web applications
             Documentation at: /docs/config/valve.html -->
        <!--
        <Valve className="org.apache.catalina.authenticator.SingleSignOn" />
        -->

        <!-- Access log processes all example.
             Documentation at: /docs/config/valve.html
             Note: The pattern used is equivalent to using pattern="common" -->
        <Valve className="org.apache.catalina.valves.AccessLogValve" directory="logs" pattern="%h %l %u %t "%r" %s %b" prefix="localhost_access_log" suffix=".txt"/>
	  
     <!--  <Context docBase="ams-admin" path="/ams-admin" reloadable="false" source="org.eclipse.jst.jee.server:ams-admin"/> -->
       <!--增加的 path="/虚拟名" docBase="虚拟路径" -->
	  <Context path="/fileupload" docBase="D:\java\sever\apache-tomcat-8.5.15\webapps\fileupload\"  reloadable="true"></Context>

修改了context标签所在的docBase，但是相关的文件夹不存在导致。

例如文件中的fileupload文件不存在，就会报Failed to start component。