Hi:
I'm trying to put together a simple Shopping Cart, but get an error along the lines of:
Exception in jsp:
javax.servlet.ServletException at
org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:367)
at _0005cbasket_0002ejspbasket_jsp_0._jspService(_0005cbasket...
What is the problem here - what's the business with PageContext? - and how do I
resolve it? Thanks in advance if you're taking the time to look at this. Here's what
my code basically looks like (I've highlighted the offending line).
First, I have shop.jsp which sets up an object of type ShoppingCart:
if (session.getValue("ShoppingCart") == null)
{
ShoppingCart cart = new ShoppingCart();
session.putValue("ShoppingCart", cart);
}
Then I have basket.jsp which attempts to add an item of type ShoppingItem
ShoppingItem aShoppingItem = new ShoppingItem(selectedItem);
ShoppingCart cart = (ShoppingCart) session.getValue("ShoppingCart");
cart.AddItem(aShoppingItem); // offending line!
session.putValue("ShoppingCart", cart);
basket.jsp is where I get the error in page compilation.
Here are my two class definitions:
package extra;
import java.util.*;
public class ShoppingCart
{
Vector listOfItems;
public ShoppingCart()
{
listOfItems = null;
}
public void AddItem(ShoppingItem anItem)
{
listOfItems.addElement(anItem);
}
}
package extra;
public class ShoppingItem
{
private String itemName;
public ShoppingItem()
{
itemName = null;
}
public ShoppingItem (String anItemName)
{
itemName = anItemName;
}
}
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