java - 元素类型 "servlet"的内容必须匹配“(icon?,servlet-name,display-name?,

Question

我知道是关于顺序的，但我已经尝试了所有的可能性，有人可以解释一下我的 web.xml 文件的顺序吗？谢谢。

 <?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE web-app
    PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
    "http://java.sun.com/dtd/web-app_2_3.dtd">

<web-app>
    <listener>
        <listener-class>com.ewheelz.SessionCounter</listener-class>
    </listener>
  <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>ConnectionPool</servlet-name>
    <servlet-class>com.ewheelz.ConnectionPool</servlet-class>
  </servlet>

  <servlet-mapping>
    <servlet-name>ConnectionPool</servlet-name>
    <url-pattern>/servlet/ConnectionPool</url-pattern>
  </servlet-mapping>
    <welcome-file-list>
        <welcome-file>Home.html</welcome-file>
    </welcome-file-list>

</web-app>

Answer 1

更改此

<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>ConnectionPool</servlet-name>
    <servlet-class>com.ewheelz.ConnectionPool</servlet-class>
  </servlet>

对此:-

  <servlet>    
    <servlet-name>ConnectionPool</servlet-name>
    <display-name>This is the display name of my J2EE component</display-name> 
    <description>This is the description of my J2EE component</description>
    <servlet-class>com.ewheelz.ConnectionPool</servlet-class>
  </servlet>

diplay-name 和描述标记应位于 servlet-name 标记之后