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

Dave Chappell

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Top Stories by Dave Chappell

The Java Message Service (JMS) is an enterprise-capable middleware component based on message-oriented middleware (MOM) fundamentals. Since its introduction as a Java software specification in November 1998, vendor implementations have brought JMS forward as a first class, e-business messaging communications platform suitable for exchanging critical business data over the Internet. This article is the first in a series of three that explain the application program interfaces (APIs), the message delivery semantics, and the deployment environments that are well suited to JMS applications. What Is JMS and Where Did It Come From? JMS defines the first and only standard for asynchronous MOM implementations. The specification defines a common set of APIs and message delivery semantics. A developer can write an application using the JMS APIs and enjoy the freedom of choosi... (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)

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)

Universal Middleware: What's Happening With OSGi and Why You Should Care

The Open Services Gateway Initiative (OSGi) Alliance is working to realize the vision of a "universal middleware" that will address issues such as application packaging, versioning, deployment, publication, and discovery. In this article we'll examine the need for the kind of container model provided by the OSGi, outline the capabilities it would provide, and discuss its relationship to complementary technologies such as SOA, SCA, and Spring. Enterprise software is often composed of large amounts of complex interdependent logic that makes it hard to adapt readily to changes in r... (more)

SOA and eXtreme Transaction Processing (XTP)

David Chappell's Blog Across financial services firms we have been seeing a new set of business priorities. There are the "grow the business" priorities that are primarily centered around things like improving customer intimacy and increasing competitive differentiation.  here are also ongoing issues of compliance to regulation and risk mitigation while also keeping an eye towards improving cost efficiency. The thing that hasn't changed is that IT is viewed as the enabler to overcome these challenges.    Financial institutions are pushing the envelope and require more processing... (more)