Hi , i've some problem when retriewing complex object from db:
(It's my first project with hibernate)..

i have a class Book that has a list of Items. (one to many classical mapping) .

I've no problems when i save the book , in db , i see the table corrisponding to Book having a new row and in the table corresponding to Item all the items related, and the items have FKkey IdBook corectly set.

But..
Wen i load a book by id with the following operation ..

Book book =session.load(Book.class, new Long(id));

i obtain the book properties and the list of item

List list = book.getItemList();

Item firstitem = list.get(0);

with a debugger i see that :
list contains all the items
unfortunatly firstitem = null .

Why? ??

Can someone help me ?

Thanks.

what is inside that getItemList method of your Book class?

Hi , i report the key methods

class Book {
Long idBook;
.... attributes


List itemList;

// methods

public List getItemList() {

return itemList;
}

...

public addItem(Item i) {
itemList.add(i);
}

What is in your setItemList method of your Book class? You only have an addItem method in your code snippet.

John