请教：castor MappingException: Could not find the class异常

package cms.Model;

public class MenuModel {
  /*mapping.xml文件中对应的属性*/
  private int id=0;
  private String icon=null;
  private String name=null;
  private String link=null;
  private String datalink=null;

  public MenuModel(){}

  public MenuModel(int id,String icon,String name,String link,String datalink){
    this.id=id;
    this.icon=icon;
    this.link=link;
    this.name=name;
    this.datalink=datalink;
  }

  /*所有属性的访问方法*/
  public int getId() {return id;}
  public String getIcon(){return icon;}
  public String getName(){return name;}
  public String getLink(){return link;}
  public String getDatalink(){return datalink;}
  /*所有属性的操作方法*/
  public void setId(int id){this.id=id;}
  public void setIcon(String icon){this.icon=icon;}
  public void setName(String name){this.name=name;}
  public void setLink(String link){this.link=link;}
  public void setDatalink(String datalink){this.datalink=datalink;}
}

<p class="indent">

package cms.Model;

import java.util.*;

public class NavlinkModel {
  /*mapping.xml文件中对应的属性*/
  private Collection menus=new ArrayList();

  public NavlinkModel(){}

  /*所有属性的访问方法*/
  public Collection getMenus(){return this.menus;}

  /*所有属性的操作方法*/
  public void addMenus(MenuModel menu){menus.add(menu);}
}
<p class="indent">

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE databases PUBLIC
"-//EXOLAB/Castor Mapping DTD Version 1.0//EN"
"http://castor.exolab.org/mapping.dtd">
<mapping>
  <class name="cms.Model.NavlinkModel" auto-complete="true">
    <map-to xml="navlink"/>
    <field name="menus" type="cms.Model.MenuModel" collection="collection">
    <bind-xml name="menuas"/>
    </field>
  </class>
  <class name="cms.Model.MenuModel" auto-complete="true">
    <map-to xml="menu"/>
    <field name="id" type="int">
      <bind-xml name="id" node="attribute"/>
    </field>
    <field name="name"/>
    <field name="icon"/>
    <field name="link"/>
    <field name="datalink"/>
  </class>

  <class name="cms.Model.BodyModel">
    <field name="id" type="int">
      <bind-xml name="id" node="attribute"/>
    </field>
    <field name="title" type="string"/>
    <field name="content" type="string"/>
    <field name="date" type="string"/>
    <field name="author" type="string"/>
    <field name="hits" type="string"/>
    <field name="status" type="string"/>
  </class>
</mapping>
<p class="indent">

<?xml version="1.0" encoding="UTF-8"?>
<navlink-model>
    <menus id="1" xsi:type="java:cms.Model.MenuModel" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
        <name>name1</name>
        <icon>icon1</icon>
        <link>link1</link>
        <datalink>datalink1</datalink>
    </menus>
    <menus id="2" xsi:type="java:cms.Model.MenuModel" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
        <name>name2</name>
        <icon>icon2</icon>
        <link>link2</link>
        <datalink>datalink2</datalink>
    </menus>
</navlink-model>

<p class="indent">