在Scripting java(javax.script)中导入一个类

我想将我在项目中创建的类导入到我的脚本中
我这样做但它不起作用：

    function doFunction(){
 //Objectif Mensuel
 importPackage(java.lang);
 importClass(KPDataModel.KPData.KPItem); //ERROR HERE,this is my class that I want to import

 KPItem kpItem = kpItemList.get(0);
 System.out.println(kpItem.CellList.get(2).Value);
 System.out.println("-------");
 var proposedMediationSum = Integer.parseInt(kpItemList.get(0).CellList.get(2).Value);
 var refusedMediationSum = Integer.parseInt(kpItemList.get(0).CellList.get(3).Value)
 var totalMediation = proposedMediationSum + refusedMediationSum;

 kpItemList.get(0).CellList.get(4).Value = totalMediation;

}