javaweb工程的web.xml中配置报错

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" 
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_2_5.xsd">
<welcome-file-list>
             <welcome-file>index.jsp</welcome-file>
        </welcome-file-list>
  <servlet>
    <description>This is the description of my J2EE component</description>
    <display-name>This is the display name of my J2EE component</display-name>
    <servlet-name>aaa</servlet-name>
    <servlet-class>com.softeem.servlet.LoginServlet</servlet-class>
  </servlet>
  <servlet>
    <description>This is the description of my J2EE component</description>
    <display-name>This is the display name of my J2EE component</display-name>
    <servlet-name>RegisterServlet</servlet-name>
    <servlet-class>com.softeem.servlet.RegisterServlet</servlet-class>
  </servlet>
  <servlet>
    <description>This is the description of my J2EE component</description>
    <display-name>This is the display name of my J2EE component</display-name>
    <servlet-name>FeelServlet</servlet-name>
    <servlet-class>com.softeem.servlet.FeelServlet</servlet-class>
  </servlet>
  <servlet-mapping>
    <servlet-name>aaa</servlet-name>
    <url-pattern>/LoginServlet</url-pattern>
  </servlet-mapping>
  <servlet-mapping>
    <servlet-name>RegisterServlet</servlet-name>
    <url-pattern>/RegisterServlet</url-pattern>
  </servlet-mapping>
  <servlet-mapping>
    <servlet-name>FeelServlet</servlet-name>
    <url-pattern>/FeelServlet</url-pattern>
  </servlet-mapping>

</web-app>

注意：红色部分区域内容必须放在Servlet前面，否则会报错。同时需要注意标签的格式，标签节点的继承关系。