ClassCastException in implementation class

Question

Why am I getting the ClassCastException:

Wrapped exception:

java.lang.ClassCastException: com.avt.model.CasePmt
    at com.avt.dao.impl.CasePmtDaoImpl.findAllCasePmt(CasePmtDaoImpl.java:68)
    at com.avt.ViewCasePmtAction.view(ViewCasePmtAction.java:127)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:585)
    at org.apache.struts.actions.DispatchAction.dispatchMethod(DispatchAction.java:280)
    at gov.pbgc.spectrum.util.SpectrumLookupDispatchAction.execute(SpectrumLookupDispatchAction.java:113)
    at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:484)
    at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:274)
    at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1482)
    at org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:525)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:763)    
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:856)

My implementation class is

public List<CasePmt> findAllCasePmt() {
            List list;
            list = getHibernateTemplate().executeFind(new HibernateCallback() {
                    public Object doInHibernate(Session session)
                                    throws HibernateException, SQLException {

                            Query q = session
                                            .getNamedQuery("findAll");
                            return q.list();
                    }
            });
            Iterator it = list.iterator();
            List<CasePmt> l = new ArrayList<CasePmt>();

            CasePmt voObj;
            while (it.hasNext()) {
                    voObj = new CasePmt();

                    Object[] objs = (Object[]) it.next();
                    // System.out.print("\n" + objs[0].toString());

                    if (objs[2] != null) {
                            voObj.setCaseTxNum(objs[1].toString());
                    }


    .......................
                        }
                    l.add(voObj);
            }
            return l;
    }

and my action call is :

List<CasePmt> CsList =       
             CasePmtBo.getCaseDao().findAllCasePmt();

Im getting error in line 68 which is "Object[] objs = (Object[]) it.next();" line. Why am i getting this issue?

Any inputs..im revisiting this today and facing the issue.

Yogendra Singh · Accepted Answer · 2012-10-30 18:45:51Z

3

I am assuming, you findAll query is to retrieve all CasePmt objects. In that case, I think you have the issue at line below:

 Object[] objs = (Object[]) it.next();

as your iterator will return CasePmt object.

Try casting it to CasePmt object as blow:

 CasePmt casePmt = (CasePmt)it.next();

answered Oct 30, 2012 at 18:45

Yogendra Singh

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8 Comments

Geek Over a year ago

I cast it to CasePmt but still in getting the same exception at the same line #.

Yogendra Singh Over a year ago

@JNPW: Can you please share your findAll query?

Geek Over a year ago

Its "Select * from JTL.Case_VW"

Geek Over a year ago

and in entity class: @Entity @NamedQueries({ @NamedQuery(name = "findAll", query = "FROM CasePmt") })

Yogendra Singh Over a year ago

@JNPW: Not sure bout your first query, but if you are using FROM CasePmt then it must be CasePmt object. To verify, change this : Object[] objs = (Object[]) it.next(); to Object objs = it.next(); and then print the class name as System.out.println(objs.getClass().getName());

|

mkl · Accepted Answer · 2012-10-30 19:41:06Z

1

In general whenever you have a ClassCastException you do not understand, instead of

Object[] objs = (Object[]) it.next();
[...]

try

Object o = it.next();
if (o instanceof Object[])
{
    Object[] objs = (Object[]) o;
    [...]
}
else if (o != null)
{
    System.out.println("Retrieved object of class " + o.getClass());
    // ... or however you want to inspect the class of the object you retrieved
}
else
    // process null value

answered Oct 30, 2012 at 19:41

mkl

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Comments

someone · Accepted Answer · 2012-10-30 18:52:52Z

0

declayer your list as

  List<Object[]> list;

if you are getting array of objects and just use it.next() instead of

 (Object[]) it.next();

answered Oct 30, 2012 at 18:52

someone

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