NoClassDefFoundError这个怎么处理？

package com.imooc.com;

import com.alibaba.fastjson.JSON;

import java.util.Calendar;

public class FastJsonSample1 {

   public static void main(String[] args) {
       Employee employee = new Employee();
       employee.setEmpno(4488);
       employee.setEname("王曉東");
       employee.setJob("客戶經理");
       employee.setDname("市場部");
       employee.setSalary(10000f);
       Calendar c = Calendar.getInstance();
       c.set(2019,0,30,0,0,0);
       employee.setHdate(c.getTime());
       //FastJason中提供了JSON對象，完成對象JSON字符串的互相轉換
       String json = JSON.toJSONString(employee);
       System.out.println(json);

       JSON.parseObject(json, Employee.class);
   }
}