Bruno Collet

Throughout this article I'll describe how an effective service-oriented architecture (SOA) can be achieved using J2EE technologies. In particular, I'll focus on which J2EE component types and communication channels to choose according to specific, real-world situations. Description of the Example System To illustrate an SOA system made of J2EE technologies, nothing is better than a good old example. Figure 1 depicts the main situations that can arise in a realistic SOA system. A component stereotype indicates the type of client or service; a dependency stereotype indicates the communication type, either as a technology (such as Web services) or as a protocol (such as CORBA IIOP); and a no dependency stereotype indicates RMI communication. The system allows client systems to process an order (service OrderWorkflow), manage customers (service Customer), and produce repo... (more)