第四章问题：创建菜单时出错

把书中目录web整个copy到Tomcat的webapps下，各文件不作任何修改。

访问：.../web

出错：左边的菜单区：【ServletException in:/admin/navlink_Action.do】null'

Tomcat后台：

04-7-30 18:12:13 [Debug:com.jdon.cms.xml.NavlinkManager:Verbose] .... try to ge

t the exsited file :D:\Tomcat 5.0\webapps\web\WEB-INF/conf\navlink.xml

04-7-30 18:12:13 [Debug:com.jdon.cms.xml.CastorHandler:Error] read com.jdon.cms

.model.NavlinkModel form file:D:\Tomcat 5.0\webapps\web\WEB-INF/conf\navlink.xml

org.xml.sax.SAXException: unable to instantiate a new type of: com.jdon.cms.Menu

{file: [not available]; line: 5; column: 18}

04-7-30 18:12:13 [Debug:com.jdon.cms.xml.NavlinkManager:Error] D:\Tomcat 5.0\web

apps\web\WEB-INF/conf\navlink.xmlexistes, can't read from itjava.lang.Exception:

org.xml.sax.SAXException: unable to instantiate a new type of: com.jdon.cms.Men

u{file: [not available]; line: 5; column: 18}

281154 [http80-Processor24] WARN action.RequestProcessor - Unhandled Exception

thrown: class java.lang.NullPointerException

好像是从XML中创建Menu对象出错，navlink.xml是这样的：

<?xml version="1.0" encoding="UTF-8"?>

<navlink>

<id>2</id>

<count>2</count>

<menu id="1">

<name>werw</name>

<link>/1.jsp</link>

<data-link>/data/1.jsp</data-link>

</menu>

<menu id="2">

<name>²≈λ</name>

<link>/2.jsp</link>

<data-link>/data/2.jsp</data-link>

</menu>

</navlink>

请帮忙，非常感谢！

ocral