When we have the following WS:

@WebService(name="BiddingService", targetNamespace="http://jboss.org/bidding")
public class BiddingBackend {

// ...

@WebMethod(operationName = "makeBid")
public Boolean makeBid(@WebParam(name = "itemName") String itemName,
@WebParam(name = "offer") Integer offer) throws java.lang.Exception

}

then the generated WSDL does not contain a fault in it's binding. It's as the method would not throw an Exception.

If the method throws a descendant of java.lang.Exception then the resulting WSDL contains everything.