[hibernate]异常，Could not find a getter for cities

[hibernate]错误，Could not find a getter for cities
相应的hbm.xml关联
<set   name= "cities ">
              <key   column= "fid "/>
              <one-to-many   class= "com.doit.person.pojo.City "   />
</set>


pojo中

private   Set   cities;
public   Set   getCities()   {
  return   cities;
  }
public   void   setCities(Set   cities)   {
this.cities   =   cities;
}

在网上看到类似的错误都是因为名称大小写混杂，现在全部都小写都有错，请问谁知道是什么原因？
Weblogic   +   Spring   +   hibernate

------解决方案--------------------
相应的hbm.xml关联
<set name= "cities ">
<key column= "fid "/>
<one-to-many class= "com.doit.person.pojo.City " />
</set>


你的这个hbm.xml对应的类是那个？是不是有个cities属性？