public class Pojo1 implements Serializable {

 private List<Foo> fooList =new ArrayList<Foo>(1);

 public Pojo1() {
 }

 public List<Foo> getFooList() {
     return fooList ;
 }

 public void setFooList(List<Foo> fooList) {
     this.fooList= fooList;
 }

private List<Bar> barList =new ArrayList<Bar>(1);

    public Pojo2() {
    }

    public List<Bar> getBarList() {
        return barList ;
    }

    public void setBarList(List<Bar> barList) {
        this.barList= barList;
    }

}

barList: [{
   (
       payload.fooList map {
           item1:$.item1
       }
   )
   } as :object {
        class :"com.fooClass"
   }]
   } as :object {
       class : "com.barClass"
   }