From the vice president and chief technologist for SOA at Oracle Corporation

Dave Chappell

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Top Stories by Dave Chappell

The notion of guaranteed delivery of Java Message Service messages has been lightly touched on in other recently published articles on JMS. But what really makes a JMS message "guaranteed"? Should you just take it on faith, or would you like to know what's behind it? This article answers these questions via a detailed discussion of message persistence, internal acknowledgment rules, and message redelivery. Using excerpts condensed from the book we coauthored, Java Message Service, we'll explain how JMS guaranteed messaging works - including once-and-only-once delivery semantics, durable subscriptions, failure and recovery scenarios, and transacted messages. JMS Guaranteed Messaging There are three key parts to guaranteed messaging: message autonomy, store-and-forward, and the underlying message acknowledgment semantics. Before we discuss these parts, we need to revi... (more)

Message-Centric Web Services vs RPC-Style Web Services

Message-centric vs RPC-style Web services is a long-standing debate and bone of contention regarding the proper use of Web services technologies. Early renditions of SOAP and XML-RPC were all about providing RPC-style interactions...in fact, that's all that was supported, so there really wasn't much choice in the matter. RPC-style interfaces have their advantages: immediate gratification of request/response, and a programming model whereby remote procedures are exposed in a way that mimics the underlying object architecture of the applications concerned, allowing a developer to ... (more)

JMS and XSLT for E-Business Messaging

XML is the new lingua franca of interapplication communication and a very rich language for describing complex business data in a heterogeneous way. Today's business environment requires building new systems that exchange XML transactions between a diverse set of applications across physical domains and corporate boundaries. Manufacturers, buyers, and suppliers have the luxury of participating in a variety of global trading exchanges to participate in a supply chain. Java Message Service (JMS) and XML are an ideal marriage in that JMS provides a simple yet robust way of transpor... (more)

ESB Myth Busters: 10 Enterprise Service Bus Myths Debunked

Since releasing my latest book, Enterprise Service Bus (O'Reilly Media, 2004), I have been doing a fair amount of visiting corporations, conducting seminars, and generally discussing with enterprise architects the subject of enterprise service-oriented architecture (SOA) and how an enterprise service bus (ESB) backbone can be leveraged to provide a framework for an enterprise SOA. Along the way, I have been asked many questions about the nature of an ESB. I have also fended off some misconceptions that have been growing in the general IT population regarding what an ESB is and wh... (more)

ESB Integration Patterns

The past several years have seen some significant technology trends, such as service-oriented architecture (SOA), enterprise application integration (EAI), business-to-business (B2B), and Web services. These technologies have attempted to address the challenges of improving the results and increasing the value of integrated business processes, and have garnered the widespread attention of IT leaders, vendors, and industry analysts. The enterprise service bus (ESB) draws the best traits from these and other technology trends to form a new architecture for integration. The ESB conc... (more)