子类映射无法实现

[GoogleCodeExporter]

问题
   我有一个
Amodel{
     private String a1;
     private String a2;
     public Cmodel getCmodel() {
        Cmodel c=new Cmodel();
        c.setC1("c1value");
        c.setC2("c2value");

        return c;
    }
}
public class Bmodel {
    private String b1;
    private String b2;
    private String b3;
}
public class Cmodel {
    private String c1;
    private String c2;
}

   现在A映射到B，关系如下
   a1->b1
   a2->b2
   cmodel.c1->b3 //无法实现

请问最后一步如何配置实现

Original issue reported on code.google.com by [email protected] on 8 Oct 2013 at 6:55