web app web.xml错误

Question

我在Eclipse中开发的GWT应用程序中出现错误.它在web.xml文件中.这是错误:

The content of element type "web-app" must match "(icon?,display-   name?,description?,distributable?,context-
     param*,filter*,filter-mapping*,listener*,servlet*,servlet-mapping*,session-config?,mime-mapping*,welcome-
     file-list?,error-page*,taglib*,resource-env-ref*,resource-ref*,security-constraint*,login-config?,security-
     role*,env-entry*,ejb-ref*,ejb-local-ref*)".

我已经看过很多关于这个的帖子,问题是文件元素的顺序,但是这个修复对我来说不起作用(我也试过把所有的<servlet-mapping>标签放在相应的后面<servlet>,它也不起作用)

我的web.xml档案:

<?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>

  <servlet>
    <servlet-name>dispatch</servlet-name>
    <servlet-class>com.yachtcloser.server.DispatchServlet</servlet-class>
    <load-on-startup>1</load-on-startup>
  </servlet>

  <servlet>
    <servlet-name>upload</servlet-name>
    <servlet-class>com.yachtcloser.server.UploadServlet</servlet-class>
    <load-on-startup>1</load-on-startup>
  </servlet> 

  <servlet>
    <servlet-name>download</servlet-name>
    <servlet-class>com.yachtcloser.server.DownloadServlet</servlet-class>
    <load-on-startup>1</load-on-startup>
  </servlet>

  <servlet>
    <servlet-name>login</servlet-name>
    <servlet-class>com.yachtcloser.server.LoginServlet</servlet-class>
    <load-on-startup>1</load-on-startup>
  </servlet>

  <servlet-mapping>
    <servlet-name>dispatch</servlet-name>
    <url-pattern>/dispatch.do</url-pattern>
  </servlet-mapping>

  <servlet-mapping>
    <servlet-name>upload</servlet-name>
    <url-pattern>/upload.do</url-pattern>
  </servlet-mapping>

  <servlet-mapping>
    <servlet-name>download</servlet-name>
    <url-pattern>/download.do</url-pattern>
  </servlet-mapping>

  <servlet-mapping>
    <servlet-name>login</servlet-name>
    <url-pattern>/login.do</url-pattern>
  </servlet-mapping>

  <!-- Default page to serve -->
  <welcome-file-list>
    <welcome-file>Yc.html</welcome-file>
  </welcome-file-list>

</web-app>

有没有其他方法来跟踪此错误; 链接到此的其他文件？

Answer 1

好吧,根据DTD的新格式,web-app标签可能包含以下标签. <!ELEMENT web-app (icon?, display-name?, description?, distributable?, context-param*, filter*, filter-mapping*, listener*, servlet*, servlet-mapping*, session-config?, mime-mapping*, welcome-file-list?, error-page*, taglib*, resource-env-ref*, resource-ref*, security-constraint*, login-config?, security-role*, env-entry*, ejb-ref*, ejb-local-ref*)>

上面提到的图标,显示名称,描述,可分发等等与DTD文件中提到的顺序相同.

例如,如果您在显示名称之前放置描述标记,则会出错.

Answer 2

我删除了该文件并将旧文件中的文本粘贴到同名的新文件中，现在没有错误了。