This week's book giveaway is in the OCPJP forum. We're giving away four copies of OCA/OCP Java SE 7 Programmer I & II Study Guide and have Kathy Sierra & Bert Bates on-line! See this thread for details.
You'll either have to change some code (most DynaUsers prefer not to) or put the form in session scope.
What is happening: 1) I assume their is an Action to populate the ActionForm with orderDetails before going to the jsp because you show that it prepopulates correctly. 2) When you submit the jsp, orderDetails.itemId is calling: getOrderDetails("0").setItemId() but fails because the orderDetails' values are not in the ActionForm (a new ActionForm is created for the submission because it is declared as request scope and, well, this is a different request from the user). 3) At this point it looks for the index of 0 in the orderDetails ArrayList but finds that the list is empty (size=0) and throws and IndexException
If you're not afraid of getting your hands dirty you can come up with a way to put the ArrayList back into the new ActionForm. The reset() method might be a good place to do this.
A good workman is known by his tools.
Joined: Jul 26, 2002
hahaa... i used the simplest trick: modify the form scope to session and it works fine Thx a lot ^3^