Reading my own post I realize this code will throw an IndexOutOfBoundsException
You need to put 'empty' datas on the List as needed :
protected List item;
public void setItem(int index, Object obj) {
if (this.item == null) {
this.item = new ArrayList(index);
}
for (int i = this.item.size(); i < index; i++) {
this.item.add("");
}
this.item.add(index, obj);
}
Nico.
> I think you can use something like this in a request scoped form-bean :
>
>
> protected List item;
>
> public void setItem(int index, Object obj) {
> if (this.item == null) {
> this.item = new ArrayList(index);
> } else {
> this.item.ensureCapacity(index);
> }
> this.item.add(index, obj);
> }
>
> This way, when form-bean population occurs, you will get a new Collection when
> needed.
>
> Nico.
>
>
> > I'd like to know if it's possible to avoid using to many session scoped
> > form beans.
> >
> > I have a bean that contains a collection and I use nested:iterate to
> > display entry fields on my html:form. When the form is submitted, I get
> > an error in BeanUtils.populate(), because the new bean (when the bean is
> > request scoped) contains an empty collection and populate() tries to set
> > the properties of the elements that existed on the bean of the previous
> > request.
> >
> > If I change the bean to session scope, everything works fine (because
> > now the bean is the same for both requests), but I think it's kind of
> > messy to have lots of session scoped beans.
> >
> > I'd appreciate to have any comments on this subject.
> >
> > Thanks
> >
> > Jorge Mascena
> >
> >
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