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consume the WSDL, bind to the service, and invoke the service using the published service description. It is possible for mere humans to browse UDDI registries and manually sift through available services. This might be something interesting for you to do if you have never experienced a UDDI registry, or you aren t familiar with how they work. You can check out one such UDDI browser at http://soapclient.com/uddisearch.html and take a peek at the services hosted at this site while you re there. For more details about the UDDI specification, hop over to www.oasisopen.org/committees/uddi-spec/doc/tcspecs.htm. Just be careful when you get there and make sure you can find your way out; we wouldn t want to lose you in the registry Transporting messages For a service consumer and producer to communicate, they need a way to send messages to each other. These messages are sent over a network using a protocol that both parties can support. Given that the Web is ubiquitous, HTTP is everywhere. It makes sense that it would be the most widely used transport for web service messages. HTTP also has the advantage that it is one of the few protocols allowed through firewalls, as long as well-known ports like 80 and 8080 are used. But as we stated, web services just need to operate over a network. That means almost any network protocol could be used to transport messages. Where HTTP is not an option, some protocols that are in use include SMTP, FTP, and JMS. What Your favorite gopher protocol not in the list Why not grab the SOAP spec and implement it yourself That ought to be a fun weekend project.

There are two primary types of web services styles: RPC-oriented and documentoriented. The RPC style of web services was popular initially, but more recently the pendulum has swung in the direction of document-oriented web services. One reason for this shift is that you can make better use of an XML schema with document-oriented web service. To learn some of the differences between RPC and document-oriented web services, visit http://expertanswercenter.techtarget.com/eac/knowledgebaseAnswer/0,295199,sid63_gci984152,00.html. The messaging style for a web service may be either literal or encoded. When you use literal, the messages are exchanged with plain XML. However, an encoded message includes an external rule about how to decode the message. The receiver of the message has to decode the message by using the decoding attribute. The WS-I Basic Profile 1.1 doesn t support encoded messages.

The most popular combination of web service style and messaging style is document/literal. This is because the WSI Basic Profile only supports the document/literal combination for maximum interoperability between platforms. Document/ literal-style messages are constrained by an XML schema. The schema can reside in the WSDL or can be referred to with an URI. The end result is that you can manage the structure of your message in the same way that DBAs manage table definitions with versioning. The RPC/encoded combination puts the schema in the actual message itself, which makes it much more tightly coupled to the message. Stick with what the WSI Basic Profile supports (document/literal), and your web services will enjoy maximum interoperability and acceptance by the widest possible audience.

<fileset dir="${src}"> <include name="**/*Bean.java" /> </fileset> <remoteinterface pattern="{0}Remote"/> <homeinterface/> <localinterface/> <localhomeinterface/> </ejbdoclet> </target>

Design by Contract is a design methodology that consists of formalizing the use of application components. To do this, a number of logical constraints must be specified and checked by the components to guarantee that their behavior is consistent with their specifications. Design by Contract concepts were popularized by Bertrand Meyer in his book, ObjectOriented Software Construction, Second Edition (Prentice Hall, 1997). Contracts were used in a number of languages, such as Eiffel, as early as 1985. AOP provides the basic techniques to efficiently implement Design by Contract. Before detailing the AOP implementation of Design by Contract, we will first explain the main principles of this methodology in the Java context.