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

Dave Chappell

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Top Stories by Dave Chappell

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 make "normal"-looking method calls in the native language. Are these benefits really worth it? Developers, system architects, standards bodies, and vendors alike have all come around to the idea that message-style interactions between Web services are an attractive alternative to RPC-style We... (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)

Service-Oriented Integration: Making the Right Choices to Support Next-Generation Integration

  Applications are increasingly being developed "built-to-integrate," providing the ability to easily expose key functionality through commonly defined interfaces. Gartner calls this concept SODA, or Service-Oriented Development of Applications, fitting into its overall Service-Oriented Architecture landscape. When applied to the ever-present integration challenge, SODA represents a transition to service-oriented integration. In this presentation, Chappell will examine the leading choices for supporting service-oriented integration: enterprise service buses (ESBs), integration ... (more)

Will the Real Reliable Messaging Please Stand Up? Is it WS-Reliability, WS-ReliableMessaging, or WS-ReliableConundrum?

Open standards for reliable Web services messaging, such as WS-Reliability, can provide the missing link to bridge the gap between organizations and help make Web services a truly enterprise-capable technology for standards-based systems integration, says Web Services Journal technical editor David Chappell. Along with security, reliable asynchronous communications has been one of the gaping holes in today's Web services architecture. Lack of reliability, due to the inherent nature of using SOAP over protocols such as HTTP, is one of the biggest obstacles to the adoption of Web s... (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)