Question

I have used this statements to populate jcombobox from MySql database table using Hibernate

    String SQL_QUERY ="from Item items";
        org.hibernate.Query query = session.createQuery(SQL_QUERY);
        for(Iterator it=query.iterate();it.hasNext();){
        Object[] row = (Object[]) it.next();
        jcbItemCode.addItem(row[0]);
        }

Here Item is my class name & items is my database table name. But NetBeans gives an error like follows & jcombo box does not populate.

INFO: schema update complete
Hibernate: select item0_.itemid as col_0_0_ from items item0_
eretailer.Item$$EnhancerByCGLIB$$99948c46 cannot be cast to [Ljava.lang.Object;

How can I correct this problem. I have searched but couldn’t find suitable answer.
I have used this method before…

String SQL_QUERY = "Select items.iid,items.idiscription,items.iprice from Item items";
          org.hibernate.Query query = session.createQuery(SQL_QUERY);
          for(Iterator it=query.iterate();it.hasNext();){
          Object[] row = (Object[]) it.next();
          jcbItemCode.addItem(row[0]);
          }

This is working perfectly.

Perhaps Net beans does not allow that way. I want to know what exactly this is. Hope your help.
Thanks!!!

Answer 1

The query from Item items, as indicated by the error message, doesn’t return Object[] instances. It returns Item instances.

If you want your combo box to contain Item instances, just use

for(Iterator it = query.iterate(); it.hasNext();) {
    Item item = (Item) it.next();
    jcbItemCode.addItem(item);
}