1. SOA using Java Web Services and Ajax
Mark D. Hansen
Author of “SOA Using Java Web Services”

2. Mark Hansen’s Background
Consultant, Entrepreneur, MIT PhD
Book and code examples at
SOA-J open source project at

3. Outline What is SOA? What are Web Services?
What are Java Web Services (JWS)?
What is AJAX?
How can you implement SOA with JWS and AJAX?
Demo (eBay, Amazon, Yahoo!)

4. What is SOA? Loose coupling Service contract Autonomy Abstraction
Reusability
Composability
Statelessness
Discoverability
“Service-Oriented Architecture”, Thomas Erl, Chapter 3 pg

5. What is a Web Service?
A provider that enables access to the service via either:
SOAP
XML / HTTP
A description or contract that specifies the request/response message structure.
WSDL
XML Schema (insufficient)
WADL (new)

6. What are Java Web Services (JWS)?
The provider is written in Java and deployed using a Java container.
The consumer is written in Java.
Java Web Service APIs are used:
JAX-WS
JAXB
WS-Metadata (JSR-181)
WSEE (JSR-109)
JAX-RPC is deprecated starting in Java EE 5

7. Client Side JWS

8. Server Side JWS

9. JAX-WS Maps WSDL to a Java API
package samples;
import javax.jws.WebService;
@WebService
public class Hello {
public String sayHello(String s) {
return "Hello: " + s; }
<definitions ... targetNamespace=" name="HelloService">
<types> ... </types>
<message name="sayHello"> ... </message>
<portType name="Hello">
<operation name="sayHello">
<input message="tns:sayHello"/>
<output message="tns:sayHelloResponse"/>
</operation>
</portType>
<binding name="HelloPortBinding" type="tns:Hello">
<soap:binding ... />
<operation name="sayHello"> ... </operation>
</binding>
<service name="HelloService">
<port name="HelloPort“ ...
</port>
</service>
</definitions>

10. JAXB Maps XML Schema to Java Classes

11. What is AJAX? Asynchronous JavaScript and XML An Interaction Model
A Set of Technologies for Rich Client Development
...
A Composite Application Framework for Flexible Business Process Management ???
“Ajax In Action”, Dave Crane et al., Chapter 2 pg 33

12. SOA Using JWS and Ajax

13. SOAShopper Architecture

14. SOAShopper – Integrating Yahoo!, Amazon, and eBay
Demo
SOAShopper – Integrating Yahoo!, Amazon, and eBay

15. eBay WSDL

16. Ant Task to Compile eBay WSDL

17. Using the Generated eBay API

18. A Client Binding Example
public List<Offer> offerSearch(
String keywords, Category category,
Price lowprice, Price highprice) {
ShopperImp binding =
BindingService.getBinding(
ShopperImp.class, EBayAPIInterface.class);
return
binding.offerSearch(keywords,
category, lowprice, highprice); }

19. Implementing a Binding Service
public abstract class BindingService {
public static <C> C getBinding(
Class<C> client, Class<?> service) {
... }

20. Flash Demo

21. Using the Dojo Table Widget
<table dojoType="filteringTable" id="fromSOAShopperData" multiple="true"
alternateRows="true" cellpadding="0" cellspacing="0" border="0"
style="margin-bottom:24px;">
<thead>
<tr>
<th field="source" dataType="String">Source</th>
<th field="thumbnail" dataType="html" align="center">Image</th>
<th field="price" dataType="String">Price</th>
<th field="summary" dataType="String">Summary</th>
<th field="url" dataType="html">Link</th>
</tr>
</thead>
</table>

22. Invoking the REST Endpoint
function retrieveURL(url) {
restURL = url;
showSearchingMsg(restURL);
if (window.XMLHttpRequest) { // Non-IE browsers
req = new XMLHttpRequest();
req.onreadystatechange = processStateChange;
try {
req.open("GET", url, true);
req.setRequestHeader('Content-type','text/xml');
} catch (e) {
alert(e); }
req.send(null);
} else if (window.ActiveXObject) { // IE
req = new ActiveXObject("Microsoft.XMLHTTP");
...

23. Loading the Dojo Table
function populateTableFromLiveSOAShopperData() {
try {
var w = dojo.widget.byId("fromSOAShopperData");
w.store.setData(theSOAShopperLiveData);
} catch(e) {
alert(e); }

24. Resources SOA Using Java Web Services http://soabook.com
Thomas Erl’s SOA Book
Ajax In Action
SOA-J open source project