Question

I’m developing my website in struts, hibernate and jsp. I had called a function which is in my DAO page from my action page like this:

private List<Order> salesDetails = new ArrayList();
salesDetails = doctorDao.getInstance().getDoctorSalesDetails(SessionObj.getId(),activityGraph);

and in my dao function I write the code like this

public List getDoctorSalesDetails(int id,int activityGraph){
    List<Order> doctorSalesDetails=new ArrayList();        
    try{
       SessionFactory sessionFactory =
                (SessionFactory) ServletActionContext.getServletContext().getAttribute(HibernateListener.KEY_NAME);
        Session Hibernatesession = sessionFactory.openSession();
        Hibernatesession.beginTransaction();
        doctorSalesDetails =    Hibernatesession.createSQLQuery("SELECT total_amount,created_at FROM `order` WHERE created_at > DATE_SUB(curdate(),INTERVAL "+activityGraph+" DAY) AND doctor_id = "+id+" GROUP BY created_at").list();
        Hibernatesession.getTransaction().commit();
    }catch(Exception e){
        e.printStackTrace();
    }
    return doctorSalesDetails;
}

The query result is successfully working here. The problem is when I access the the return variable from my action page like this:

    try{
       for( Order o:  salesDetails) {
           System.out.println("Total amount="+o.getCreatedAt());
       }
    }catch(Exception e){
        e.printStackTrace();
    }

it causes following error :

java.lang.ClassCastException: [Ljava.lang.Object; cannot be cast to com.myDrDirect.hbmobj.Order
    at com.myDrDirect.doctor.action.DoctorDashBoardActivity.getDashBoardActivityDetails(DoctorDashBoardActivity.java:36)

What might be the issue?

Answer 1

private List<Order> salesDetails = new ArrayList();

salesDetails = doctorDao.getInstance().getDoctorSalesDetails(SessionObj.getId(),activityGraph);

In the above statement salesDetails must accept elements which is of type “Order” .

doctorSalesDetails =    Hibernatesession.createSQLQuery("SELECT total_amount,created_at FROM `order` WHERE created_at > DATE_SUB(curdate(),INTERVAL "+activityGraph+" DAY) AND doctor_id = "+id+" GROUP BY created_at").list();

In the above line doctorSalesDetails is of type “Object” and the same thing you are returning to salesDetails.

So as per your statement

salesDetails which is expected to hold a Order is holding an Object.

As a result , its throwing ClassCastException .