Most of the Oracle ATG Web Commerce form handlers extend atg.commerce.order.purchase.PurchaseProcessFormHandler. This form handler, which is a subclass of atg.droplet.GenericFormHander, is an abstract class which implements a transaction management pattern that should be followed by any custom form handlers. This transaction management pattern is implemented through the form handler’s beforeSet, afterSet, and handler methods provided as part of the Commerce form handlers.

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