Indexed Properties and Population

[Raible, Matt]

I have an ArrayList on a form... let's call the form Parent and the
ArrayList Children.

If I have:

private ArrayList children;

public void setChildren(int index, ChildForm childForm) {
        this.children.set(index, childForm);
}

Then saving my form results in a NPE for BeanUtils.copyProperties.  If I
create a whole bunch of objects in the ArrayList in the constructor - I
avoid this problem:

public ParentForm () {
    children = new ArrayList(100);
    for (int i=0; i < 100; i++) {
        children.add(new ChildForm());
}

But I'm guessing that this fits better into the reset(mapping, request)
method of my form.  My question is - how do I determine how many there are?
Is there something in the request this this information - or should I set a
hidden field with the number of children?

Thanks,

Matt


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