Handling business faults in Mediators
Handling business faults within Mediators is a lot simpler than in BPEL. This is due to the role it plays within a composite. It's primary role (as covered in Chapter 10, oBay Introduction) is to act as a proxy to the composite, which means that it is responsible for receiving all incoming messages for a composite, validating and optionally transforming them before routing them to the appropriate component within the composite, and then routing any response back to the initial caller.
A business fault, by our definition, is just another valid response that can be returned by a component. Therefore, the role of the Mediator is to transform that fault from a component-specific one to one defined in the WSDL of ...
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