web.xml里的这个错误是什么意思？？谢谢！

时间：2021-09-20 13:35:59
schema_reference.4: Failed to read schema document 'web-app_2_4.xsd', because 1) could not find the document; 2) the document could not be read; 3) the root element of the document is not <xsd:schema>.

我用jb2005打开工程里的web.xml时候，出现很多这个错误，这个到底是什么错误呢？？

9 个解决方案

#1

你把工程下的所有class文件，和缓存文件全部删除，然后重新编译！

要手工删除！

如果还是不行，就就另外写一个web.xml文件，拷贝到wen-inf目录下，覆盖原来的那个！

试下！

#2

还是有这个错误

我的web.xml
-----------------------------------
<?xml version="1.0" encoding="ISO-8859-1"?>

<!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 xmlns="http://java.sun.com/xml/ns/j2ee"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee web-app_2_4.xsd"
    version="2.4">

  <display-name>JSP</display-name>
  <description>
    JSP
  </description>
  <filter>
     <filter-name>managerAuth</filter-name> 
     <filter-class>com.jspdev.filter.ManagerFilter</filter-class>
     <init-param>
             <param-name>manager</param-name>
             <param-value>0</param-value>
     </init-param>
    </filter>
    <filter>
     <filter-name>encoding</filter-name> 
     <filter-class>com.jspdev.ch8.EncodingFilter</filter-class>
     <init-param>
             <param-name>encoding</param-name>
             <param-value>gb2312</param-value>
     </init-param>
    </filter>
    <filter>
     <filter-name>auth</filter-name> 
           <filter-class>com.jspdev.filter.SignonFilter</filter-class> 
    </filter>
    
    <filter-mapping> 
       <filter-name>encoding</filter-name> 
       <url-pattern>/*</url-pattern>  
     </filter-mapping>
     
    <filter-mapping> 
       <filter-name>managerAuth</filter-name> 
       <url-pattern>/manage1/*</url-pattern>  
   </filter-mapping>

    <servlet>
        <servlet-name>ViewMessageServlet</servlet-name>
        <servlet-class>com.jspdev.ch9.ViewMessageServlet</servlet-class>
    </servlet>
    <servlet>
        <servlet-name>login</servlet-name>
        <jsp-file>/index.jsp</jsp-file>
    </servlet>
     <servlet>
        <servlet-name>TestServletConfig</servlet-name>
        <servlet-class>com.jspdev.servlet.test.TestServletConfig</servlet-class>
    </servlet>
     <servlet>
        <servlet-name>AddMessageServlet</servlet-name>
        <servlet-class>com.jspdev.ch9.AddMessageServlet</servlet-class>
    </servlet>
    <servlet>
        <servlet-name>forumservlet</servlet-name>
        <servlet-class>com.jspdev.servlet.ForumServlet</servlet-class>
    </servlet>
     <servlet>
        <servlet-name>newtopicservlet</servlet-name>
        <servlet-class>com.jspdev.servlet.NewTopicServlet</servlet-class>
    </servlet>
     <servlet>
        <servlet-name>edittopicservlet</servlet-name>
        <servlet-class>com.jspdev.servlet.EditTopicServlet</servlet-class>
    </servlet>
     <servlet>
        <servlet-name>deletetopicservlet</servlet-name>
        <servlet-class>com.jspdev.servlet.DeleteTopicServlet</servlet-class>
    </servlet>
     <servlet>
        <servlet-name>replytopicservlet</servlet-name>
        <servlet-class>com.jspdev.servlet.ReplyTopicServlet</servlet-class>
    </servlet>
     <servlet-mapping>
        <servlet-name>ViewMessageServlet</servlet-name>
        <url-pattern>/viewMessages_servlet</url-pattern>
    </servlet-mapping>
     <servlet-mapping>
        <servlet-name>AddMessageServlet</servlet-name>
        <url-pattern>/addMessages_servlet</url-pattern>
    </servlet-mapping>
    <servlet-mapping>
        <servlet-name>TestServletConfig</servlet-name>
        <url-pattern>/servlet/test</url-pattern>
    </servlet-mapping>
    <servlet-mapping>
        <servlet-name>login</servlet-name>
        <url-pattern>/login</url-pattern>
    </servlet-mapping>
     <servlet-mapping>
        <servlet-name>forumservlet</servlet-name>
        <url-pattern>/servlet/forumservlet</url-pattern>
    </servlet-mapping>
      <servlet-mapping>
        <servlet-name>newtopicservlet</servlet-name>
        <url-pattern>/servlet/newtopicservlet</url-pattern>
    </servlet-mapping>
      <servlet-mapping>
        <servlet-name>edittopicservlet</servlet-name>
        <url-pattern>/servlet/edittopicservlet</url-pattern>
    </servlet-mapping>
    <servlet-mapping>
        <servlet-name>deletetopicservlet</servlet-name>
        <url-pattern>/servlet/deletetopicservlet</url-pattern>
    </servlet-mapping>
    
     <servlet-mapping>
        <servlet-name>replytopicservlet</servlet-name>
        <url-pattern>/servlet/replytopicservlet</url-pattern>
    </servlet-mapping>
    
    <welcome-file-list>
      <welcome-file>index.jsp</welcome-file>
      <welcome-file>index.html</welcome-file>
    </welcome-file-list>   
  
    
       <taglib>
        <taglib-uri>http://hellking.com/function</taglib-uri>
        <taglib-location>/WEB-INF/functions.tld</taglib-location>
    </taglib>
    <taglib>
    <taglib-uri>http://java.sun.com/jstl/fmt</taglib-uri>
    <taglib-location>/WEB-INF/fmt.tld</taglib-location>
</taglib>

<taglib>
    <taglib-uri>http://java.sun.com/jstl/fmt-rt</taglib-uri>
    <taglib-location>/WEB-INF/fmt-rt.tld</taglib-location>
</taglib>

<taglib>
    <taglib-uri>http://java.sun.com/jstl/core</taglib-uri>
    <taglib-location>/WEB-INF/c.tld</taglib-location>
</taglib>

<taglib>
    <taglib-uri>http://java.sun.com/jstl/core-rt</taglib-uri>
    <taglib-location>/WEB-INF/c-rt.tld</taglib-location>
</taglib>

<taglib>
    <taglib-uri>http://java.sun.com/jstl/sql</taglib-uri>
    <taglib-location>/WEB-INF/sql.tld</taglib-location>
</taglib>

<taglib>
    <taglib-uri>http://java.sun.com/jstl/sql-rt</taglib-uri>
    <taglib-location>/WEB-INF/sql-rt.tld</taglib-location>
</taglib>

<taglib>
    <taglib-uri>http://java.sun.com/jstl/x</taglib-uri>
    <taglib-location>/WEB-INF/x.tld</taglib-location>
</taglib>

<taglib>
    <taglib-uri>http://java.sun.com/jstl/x-rt</taglib-uri>
    <taglib-location>/WEB-INF/x-rt.tld</taglib-location>
</taglib>

</web-app>

#3

xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee web-app_2_4.xsd"  

这里这样写试试
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"

#4

楼上的大哥，像你所说的那么改后 出现了以下错误：

      
src-resolve: Cannot resolve the name 'j2ee:jsp-configType' to a(n) type definition component.

src-resolve: Cannot resolve the name 'j2ee:jsp-fileType' to a(n) type definition component.

cvc-complex-type.2.4.a: Invalid content starting with element 'taglib'. One of '{"http://java.sun.com/xml/ns/j2ee":description, "http://java.sun.com/xml/ns/j2ee":display-name, "http://java.sun.com/xml/ns/j2ee":icon, "http://java.sun.com/xml/ns/j2ee":distributable, "http://java.sun.com/xml/ns/j2ee":context-param, "http://java.sun.com/xml/ns/j2ee":filter, "http://java.sun.com/xml/ns/j2ee":filter-mapping, "http://java.sun.com/xml/ns/j2ee":listener, "http://java.sun.com/xml/ns/j2ee":servlet, "http://java.sun.com/xml/ns/j2ee":servlet-mapping, "http://java.sun.com/xml/ns/j2ee":session-config, "http://java.sun.com/xml/ns/j2ee":mime-mapping, "http://java.sun.com/xml/ns/j2ee":welcome-file-list, "http://java.sun.com/xml/ns/j2ee":error-page, "http://java.sun.com/xml/ns/j2ee":jsp-config, "http://java.sun.com/xml/ns/j2ee":security-constraint, "http://java.sun.com/xml/ns/j2ee":login-config, "http://java.sun.com/xml/ns/j2ee":security-role, "http://java.sun.com/xml/ns/j2ee":env-entry, "http://java.sun.com/xml/ns/j2ee":ejb-ref, "http://java.sun.com/xml/ns/j2ee":ejb-local-ref, "http://java.sun.com/xml/ns/j2ee":service-ref, "http://java.sun.com/xml/ns/j2ee":resource-ref, "http://java.sun.com/xml/ns/j2ee":resource-env-ref, "http://java.sun.com/xml/ns/j2ee":message-destination-ref, "http://java.sun.com/xml/ns/j2ee":message-destination, "http://java.sun.com/xml/ns/j2ee":locale-encoding-mapping-list}' is expected.

#5

楼主这样改把
<web-app xmlns="http://java.sun.com/xml/ns/j2ee"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee web-app_2_4.xsd"
    version="2.4">

改成
<web-app>
一切OK 
:)

#6

大哥
改成<web-app>会出现，如下错误两处：

Element type "jsp-config" must be declared.


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*)".

#7

<?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>
。。。。。
。。。。。
</web-app>


----------------
这个是我的呀，<web-app>节点里边根本就没有那么多的参数呀，直接去掉，应该不会有问题，！
如果有什么警告，你不要理会，看程序能不能编译的通！

#8

看一看web-inf目录下面，一般会有一个web-app_*_*.dtd类似的文件，把你的web-app_2_4.dtd替换成那个估计就可以了，

#9

改成那样“<web-app>”，编译出现很多错误


在web-inf目录下也没有类似web-app_*_*.dtd的文件


那么现在应该怎么做啊？？？？？？？？？？？？？？

#1

你把工程下的所有class文件，和缓存文件全部删除，然后重新编译！

要手工删除！

如果还是不行，就就另外写一个web.xml文件，拷贝到wen-inf目录下，覆盖原来的那个！

试下！

#2

还是有这个错误

我的web.xml
-----------------------------------
<?xml version="1.0" encoding="ISO-8859-1"?>

<!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 xmlns="http://java.sun.com/xml/ns/j2ee"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee web-app_2_4.xsd"
    version="2.4">

  <display-name>JSP</display-name>
  <description>
    JSP
  </description>
  <filter>
     <filter-name>managerAuth</filter-name> 
     <filter-class>com.jspdev.filter.ManagerFilter</filter-class>
     <init-param>
             <param-name>manager</param-name>
             <param-value>0</param-value>
     </init-param>
    </filter>
    <filter>
     <filter-name>encoding</filter-name> 
     <filter-class>com.jspdev.ch8.EncodingFilter</filter-class>
     <init-param>
             <param-name>encoding</param-name>
             <param-value>gb2312</param-value>
     </init-param>
    </filter>
    <filter>
     <filter-name>auth</filter-name> 
           <filter-class>com.jspdev.filter.SignonFilter</filter-class> 
    </filter>
    
    <filter-mapping> 
       <filter-name>encoding</filter-name> 
       <url-pattern>/*</url-pattern>  
     </filter-mapping>
     
    <filter-mapping> 
       <filter-name>managerAuth</filter-name> 
       <url-pattern>/manage1/*</url-pattern>  
   </filter-mapping>

    <servlet>
        <servlet-name>ViewMessageServlet</servlet-name>
        <servlet-class>com.jspdev.ch9.ViewMessageServlet</servlet-class>
    </servlet>
    <servlet>
        <servlet-name>login</servlet-name>
        <jsp-file>/index.jsp</jsp-file>
    </servlet>
     <servlet>
        <servlet-name>TestServletConfig</servlet-name>
        <servlet-class>com.jspdev.servlet.test.TestServletConfig</servlet-class>
    </servlet>
     <servlet>
        <servlet-name>AddMessageServlet</servlet-name>
        <servlet-class>com.jspdev.ch9.AddMessageServlet</servlet-class>
    </servlet>
    <servlet>
        <servlet-name>forumservlet</servlet-name>
        <servlet-class>com.jspdev.servlet.ForumServlet</servlet-class>
    </servlet>
     <servlet>
        <servlet-name>newtopicservlet</servlet-name>
        <servlet-class>com.jspdev.servlet.NewTopicServlet</servlet-class>
    </servlet>
     <servlet>
        <servlet-name>edittopicservlet</servlet-name>
        <servlet-class>com.jspdev.servlet.EditTopicServlet</servlet-class>
    </servlet>
     <servlet>
        <servlet-name>deletetopicservlet</servlet-name>
        <servlet-class>com.jspdev.servlet.DeleteTopicServlet</servlet-class>
    </servlet>
     <servlet>
        <servlet-name>replytopicservlet</servlet-name>
        <servlet-class>com.jspdev.servlet.ReplyTopicServlet</servlet-class>
    </servlet>
     <servlet-mapping>
        <servlet-name>ViewMessageServlet</servlet-name>
        <url-pattern>/viewMessages_servlet</url-pattern>
    </servlet-mapping>
     <servlet-mapping>
        <servlet-name>AddMessageServlet</servlet-name>
        <url-pattern>/addMessages_servlet</url-pattern>
    </servlet-mapping>
    <servlet-mapping>
        <servlet-name>TestServletConfig</servlet-name>
        <url-pattern>/servlet/test</url-pattern>
    </servlet-mapping>
    <servlet-mapping>
        <servlet-name>login</servlet-name>
        <url-pattern>/login</url-pattern>
    </servlet-mapping>
     <servlet-mapping>
        <servlet-name>forumservlet</servlet-name>
        <url-pattern>/servlet/forumservlet</url-pattern>
    </servlet-mapping>
      <servlet-mapping>
        <servlet-name>newtopicservlet</servlet-name>
        <url-pattern>/servlet/newtopicservlet</url-pattern>
    </servlet-mapping>
      <servlet-mapping>
        <servlet-name>edittopicservlet</servlet-name>
        <url-pattern>/servlet/edittopicservlet</url-pattern>
    </servlet-mapping>
    <servlet-mapping>
        <servlet-name>deletetopicservlet</servlet-name>
        <url-pattern>/servlet/deletetopicservlet</url-pattern>
    </servlet-mapping>
    
     <servlet-mapping>
        <servlet-name>replytopicservlet</servlet-name>
        <url-pattern>/servlet/replytopicservlet</url-pattern>
    </servlet-mapping>
    
    <welcome-file-list>
      <welcome-file>index.jsp</welcome-file>
      <welcome-file>index.html</welcome-file>
    </welcome-file-list>   
  
    
       <taglib>
        <taglib-uri>http://hellking.com/function</taglib-uri>
        <taglib-location>/WEB-INF/functions.tld</taglib-location>
    </taglib>
    <taglib>
    <taglib-uri>http://java.sun.com/jstl/fmt</taglib-uri>
    <taglib-location>/WEB-INF/fmt.tld</taglib-location>
</taglib>

<taglib>
    <taglib-uri>http://java.sun.com/jstl/fmt-rt</taglib-uri>
    <taglib-location>/WEB-INF/fmt-rt.tld</taglib-location>
</taglib>

<taglib>
    <taglib-uri>http://java.sun.com/jstl/core</taglib-uri>
    <taglib-location>/WEB-INF/c.tld</taglib-location>
</taglib>

<taglib>
    <taglib-uri>http://java.sun.com/jstl/core-rt</taglib-uri>
    <taglib-location>/WEB-INF/c-rt.tld</taglib-location>
</taglib>

<taglib>
    <taglib-uri>http://java.sun.com/jstl/sql</taglib-uri>
    <taglib-location>/WEB-INF/sql.tld</taglib-location>
</taglib>

<taglib>
    <taglib-uri>http://java.sun.com/jstl/sql-rt</taglib-uri>
    <taglib-location>/WEB-INF/sql-rt.tld</taglib-location>
</taglib>

<taglib>
    <taglib-uri>http://java.sun.com/jstl/x</taglib-uri>
    <taglib-location>/WEB-INF/x.tld</taglib-location>
</taglib>

<taglib>
    <taglib-uri>http://java.sun.com/jstl/x-rt</taglib-uri>
    <taglib-location>/WEB-INF/x-rt.tld</taglib-location>
</taglib>

</web-app>

#3

xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee web-app_2_4.xsd"  

这里这样写试试
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"

#4

楼上的大哥，像你所说的那么改后 出现了以下错误：

      
src-resolve: Cannot resolve the name 'j2ee:jsp-configType' to a(n) type definition component.

src-resolve: Cannot resolve the name 'j2ee:jsp-fileType' to a(n) type definition component.

cvc-complex-type.2.4.a: Invalid content starting with element 'taglib'. One of '{"http://java.sun.com/xml/ns/j2ee":description, "http://java.sun.com/xml/ns/j2ee":display-name, "http://java.sun.com/xml/ns/j2ee":icon, "http://java.sun.com/xml/ns/j2ee":distributable, "http://java.sun.com/xml/ns/j2ee":context-param, "http://java.sun.com/xml/ns/j2ee":filter, "http://java.sun.com/xml/ns/j2ee":filter-mapping, "http://java.sun.com/xml/ns/j2ee":listener, "http://java.sun.com/xml/ns/j2ee":servlet, "http://java.sun.com/xml/ns/j2ee":servlet-mapping, "http://java.sun.com/xml/ns/j2ee":session-config, "http://java.sun.com/xml/ns/j2ee":mime-mapping, "http://java.sun.com/xml/ns/j2ee":welcome-file-list, "http://java.sun.com/xml/ns/j2ee":error-page, "http://java.sun.com/xml/ns/j2ee":jsp-config, "http://java.sun.com/xml/ns/j2ee":security-constraint, "http://java.sun.com/xml/ns/j2ee":login-config, "http://java.sun.com/xml/ns/j2ee":security-role, "http://java.sun.com/xml/ns/j2ee":env-entry, "http://java.sun.com/xml/ns/j2ee":ejb-ref, "http://java.sun.com/xml/ns/j2ee":ejb-local-ref, "http://java.sun.com/xml/ns/j2ee":service-ref, "http://java.sun.com/xml/ns/j2ee":resource-ref, "http://java.sun.com/xml/ns/j2ee":resource-env-ref, "http://java.sun.com/xml/ns/j2ee":message-destination-ref, "http://java.sun.com/xml/ns/j2ee":message-destination, "http://java.sun.com/xml/ns/j2ee":locale-encoding-mapping-list}' is expected.

#5

楼主这样改把
<web-app xmlns="http://java.sun.com/xml/ns/j2ee"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee web-app_2_4.xsd"
    version="2.4">

改成
<web-app>
一切OK 
:)

#6

大哥
改成<web-app>会出现，如下错误两处：

Element type "jsp-config" must be declared.


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*)".

#7

<?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>
。。。。。
。。。。。
</web-app>


----------------
这个是我的呀，<web-app>节点里边根本就没有那么多的参数呀，直接去掉，应该不会有问题，！
如果有什么警告，你不要理会，看程序能不能编译的通！

#8

看一看web-inf目录下面，一般会有一个web-app_*_*.dtd类似的文件，把你的web-app_2_4.dtd替换成那个估计就可以了，

#9

改成那样“<web-app>”，编译出现很多错误


在web-inf目录下也没有类似web-app_*_*.dtd的文件


那么现在应该怎么做啊？？？？？？？？？？？？？？
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