136
Designing XML Based Applications
  Returned to a Web service client: if the application is accessing a Web service 
through JAX RPC. (See Chapter 5 for more details.)
  Through a JMS queue or topic (possibly attached to a message driven bean in 
the EJB tier) when implementing a business process workflow or implement 
ing an asynchronous Web service architecture. (See  Delegating Web Service 
Requests to Processing Layer  on page 92.) 
Note that a generic XML based application can additionally receive and
return XML documents through a servlet over plain HTTP.
Recall from Chapter 3 that a Web service application must explicitly handle
certain XML schemas schemas for SOAP parameters that are not bound to Java
objects and schemas of XML documents passed as attachments to SOAP mes 
sages. Since the JAX RPC runtime passes SOAP parameter values (those that are
not
 bound to Java objects) as 
SOAPElement
 document fragments, an application
can consume and process them as DOM trees and even programmatically bind
them to Java objects using XML data binding techniques such as JAXB. Docu 
ments might be passed as attachments to SOAP messages when they are very
large, legally binding, or the application processing requires the complete docu 
ment infoset. Documents sent as attachments may also conform to schemas
defined in languages not directly supported by the Web service endpoint. 
Code Example 4.2 and Code Example 4.3 illustrate sending and receiving
XML documents.
public class SupplierOrderSender {
private SupplierService_Stub supplierService;
public SupplierOrderSender(URL serviceEndPointURL) {
// Create a supplier Web service client stub
supplierService = ...
return;
}
// Submits a purchase order document to the supplier Web service
public String submitOrder(Source supplierOrder)
throws RemoteException, InvalidOrderException {
String trackingNumber
= supplierService.submitOrder(supplierOrder);
return trackingNumber;






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