JMapper扩展类的XML配置

Question

我想配置xml文件以映射到扩展类，但是获取UndefinedMappingException。我能找到的唯一相关主题是this

这是我的实施：

Dim ts As TimeSpan = DateTime.Now - serverDate

目的地类：

var newScrollLeft=$('#scrollquestion').scrollLeft();
      var divWidth = $('#scrollquestion').outerWidth();
      var scrollwidth =$('#scrollquestion').get(0).scrollWidth;
      if(newScrollLeft === scrollwidth - divWidth){
        alert('right end');
      }

扩展类：

JMapper<RequestD, RequestS> mapper =
            new JMapper<>(RequestD.class, RequestS.class, "jmapper.xml");
    RequestD requestD = mapper.getDestination(someRequestS);

来源类：

public class RequestD extends RequestBase {
    private static final long serialVersionUID = 1L;
}

jmapper.xml：

public abstract class RequestBase implements Serializable {
private static final long serialVersionUID = 1L;

private Language language;
private DateTime requestDateTime;
private String currency;
private Order order;

/**
 * Getters and Setters 
 */