Current functionality:
Once you enter a payment, you can not delete it.

Desired functionality:
Show a link on the left side: “Delete” (just like the invoice page), for those payment that are NOT linked to any invoice. This functionality is only for root or clerk user profiles, not for customers.
A confirmation page should be displayed .

Technical overview:
This is a simple change, although it goes through the three tiers, so it is a great learning issue to take on. You can take the invoice deletion as an example on how to display the 'Delete' link on the left and how to manage a confirmation step. This link should be shown only for those users that have the permissions to do it. You can use the current permission for editing payments.

Client tier modifications:
You'll need to modify /view/payment/viewLeftBar.jsp to add the 'delete' link. Note how the request parameters are being used to let know the view page that this is a confirmation of a deletion. As an example, the page /view/invoice/viewBody.jsp picks up the parameter with the use of this line .

Server tier modifications:
We need PaymentSessionBean.delete(id) and PaymentBL.delete(id). The first one interacts with the client tier and calls the second one, which deals with the database tier. There is not much code to write here, just find the payment entity bean and mark is as deleted.

Database tier modifications:
The calls does not delete the actual database row, just 'soft deletes' the row by updating the payment.deleted = 1. Since the setter of this field in the entity bean is not exposed, you need to add the xdoclet tag to it:
/**
* @ejb:interface-method view-type="local"
*/

Changes mostly to be done in these files:
New file for the client tier: viewLeftBar.jsp.
/descriptions/web/tiles-defs.xml
/view/payment/viewBody.jsp
PaymentSessionBean.java
PaymentBL.java
PermissionConstants.java
PaymentEntityBean.java
init.sql (for the new permission)

This feature was completed as revision 37