web.xml文件报错:cvc-complex-type.2.4.a: Invalid content was found starting with element 'init-param'.

<?xml version="1.0" encoding="UTF-8"?>
<web-app
        version="3.0"
        xmlns="http://java.sun.com/xml/ns/javaee"
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"> 

报错的servlet节点

   <servlet>
     <servlet-name>Spring</servlet-name>
     <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
     <load-on-startup>1</load-on-startup>
     <async-supported>true</async-supported>
     <init-param>
       <param-name>contextConfigLocation</param-name>
       <param-value>classpath:config/spring-servlet.xml</param-value>
     </init-param>
   </servlet>

报错提示在第6行

错误提示内容:

cvc-complex-type.2.4.a: Invalid content was found starting with element 'init-param'. One of '{"http://java.sun.com/xml/ns/javaee":run-as, "http://java.sun.com/xml/ns/javaee":security-
 role-ref, "http://java.sun.com/xml/ns/javaee":multipart-config}' is expected.

解决方法:

把4,5行放到9,10行之间,代码如下

   <servlet>
     <servlet-name>Spring</servlet-name>
     <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
     <init-param>
       <param-name>contextConfigLocation</param-name>
       <param-value>classpath:config/spring-servlet.xml</param-value>
     </init-param>
     <load-on-startup>1</load-on-startup>
     <async-supported>true</async-supported>
   </servlet>