Spring MVC class cannot be converted to object

Question

I am creating a spring project. Here is the code.

public ModelAndView SController(ModelMap model)
{
    P p = new P();
    List<Object[]> myList = (List<Object[]>)this.myservice.getList("abcd");

    for (Object[] lst : myList)
        p.setName(lst[0].toString());

}

public List<Object[]> getList(String name)
{
     return this.sessionFactory.getCurrentSession().createQuery("FROM P WHERE c_name LIKE ")
        .setString(0,  "%" + name + "%").list();
}

I am getting the error on this line

for (Object[] lst : myList)

Error

request processing failed nested exception is java.lang.classcastexception: com.site.MyClass cannot be cast to [Ljava.lang.Object;

Why this error is coming?

EDIT:

SnapShot of debugger

provide complete code. "QUERY" means what ? is it hibernate query or simple sql query ? model return by getList must not be Object[]... It must be MyClass as your exception says that.. — Kunal Surana
– Kunal Surana, Commented Feb 22, 2016 at 11:14

Kunal Surana · Accepted Answer · 2016-02-22 11:40:44Z

1

Modifying answer after query is provided in your question as below :

public ModelAndView SController(ModelMap model)
{
    P p = new P();
    List<P> myList = (List<P>) this.myservice.getList("abcd");

    for (P lst : myList)
        p.setName(lst.getName());

}

Here we can typecast the list to have more generic type of list. It might give warning which can be suppressed as we know it will always return list of P objects.

public List getList(String name)
{
     return this.sessionFactory.getCurrentSession().createQuery("FROM P WHERE c_name LIKE ")
        .setString(0,  "%" + name + "%").list();
}

this getList method will return list of P objects where c_name like your name input

edited Feb 22, 2016 at 11:40

answered Feb 22, 2016 at 11:30

Kunal Surana

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Comments

Ranjith Kumar · Accepted Answer · 2016-02-22 11:12:36Z

1

you can use JSONObject instead. It is suitable for array of data.

answered Feb 22, 2016 at 11:12

Ranjith Kumar

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Comments

mtyurt · Accepted Answer · 2016-02-22 11:35:51Z

This is the javadoc of list method:

Return the query results as a List. If the query contains
multiple results per row, the results are returned in an instance
of Object[].

list returns only List, which is not type safe, it can be List<Object[]> or just List<Object>. You need to check if the list contains single object or object array:

List list = this.myservice.getList("abcd");
   for (Object o : list) {
       if(o instanceof Object[]){
          Object[] array = (Object[]) o;
       } else {  
          //object
       }
   }

EDIT

Class cast exception says it cannot convert MyClass to Object[], my guess is hibernate deserializes directly into MyClass instance. Re-implement your code according to this. You can check it by investigating List list = this.myservice.getList("abcd"); I gave above in debug mode.

Vikrant Kashyap · Accepted Answer · 2016-02-22 11:51:39Z

1

try this may help you out..Click

answered Feb 22, 2016 at 11:51

Vikrant Kashyap

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