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

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

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns="http://xmlns.jcp.org/xml/ns/javaee"
    xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
    id="WebApp_ID" version="3.1">

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>