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

Dave Chappell

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Top Stories by Dave Chappell

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 concept is a new approach to integration that can provide the underpinnings for a loosely coupled integration network that can scale beyond the limits of a hub-and-spoke EAI broker. An ESB is a highly distributed, event-driven, enterprise SOA that is geared toward integration. It is a standards... (more)

Guaranteed Messaging With JMS

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,... (more)

JAXM: Interoperable SOAP Communications for the Java Platform

The Java API for XML Messaging (JAXM) is a new Java application programming interface (API) that provides a standard way for Java applications to send and receive Simple Object Access Protocol (SOAP) messages. The basic idea is to allow developers to spend more time building, sending, receiving, and deconstructing messages for their applications and less time programming low-level XML communications routines. Developed through the Java Community Process, JAXM provides a simple yet flexible standard API for developing and deploying SOAP-based applications that can be truly interop... (more)

Reconstructing J2EE-Java Business Integration Meets the Enterprise Service Bus

Web services have given newfound importance to service-oriented architectures and promise to drive down the cost of integration by providing a standards-based approach to interoperability between applications. The trouble is, what people really want is a new way of doing integration. Until now, we haven't really had a way to incorporate Web services into a meaningful architecture for integrating applications and services into a fabric that spans the extended enterprise in a large-scale fashion. With the advent of the enterprise service bus we have that architecture. The Java Bus... (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)