Struts action class that corresponds to the product list page. Used for
requests to "/ProductList.do".
The execute method of this class retrieves information from the
database for the list of active products in the system and puts it in the
request scope for use by the view layer. Given a
ProductListForm, which may
have its firstRow property populated for pagination, it creates
and initializes an instance of
ProductList. It then
to load the product list information from the database. It puts the
initialized ProductList object in the request scope as an
attribute with the name "productList".