Tyler Jewell

By their very nature, Web services operate in a loosely-coupled, geographically-dispersed environ-ment. From an infrastructure perspective, what does this mean for transaction processing systems? Do the existing approaches to handling transactions through the use of an XA-compliant, two-phase commit transaction manager apply directly to Web services? Typical transaction manage-ment infrastructures have complete control over the resources that participate in a transaction: either every resource fully commits or fully rolls back. In a Web services environment, however, the resources that need to participate in a business transaction need to be aligned, but not dictated to. The business actions of one service need to coordinate and align themselves with the business actio... (more)

An Introduction to WebLogic Server Clustering

This is the second in a series of three articles discussing the clustering capabilities of BEA WebLogic Server 6.1 (WLS). This month we discuss replica-aware stubs, their impact on a clustered system, and how they're used with EJBs. How WebLogic Can Instrument EJBs WebLogic can provide clustering logic for an EJB in four possible locations (see Figure 1): The JNDI naming server, where th... (more)

An introduction to WebLogic Server Clustering

Welcome to the first issue of BEA WebLogic Developer's Journal! This article is the first of a three-part series geared around the clustering capabilities of BEA WebLogic Server (WLS) 6.1 and aimed at introductory and advanced audiences. This article will talk about the importance of clustering and the high-level clustering capabilities of WLS, provide an in-depth analysis of HttpSession... (more)

Which Integration Approach is Best?

Recently I made a long trip to the East Coast. While there, I was able to meet with a number of developers, customers, and partners. I spoke to a variety of people and heard about a number of interesting community goings-on. Lately, I've been on a big Web services kick. I've spent a significant amount of time studying, speaking, and writing about this technology. While speaking to a num... (more)

The Impact Of EJB 2.0

Last summer, Sun Microsystems released the first public draft of the EJB 2.0 specification with a lot of fanfare. Since then, it's been through a whirlwind of discussion, controversy, and modifications. Yes, modifications. The latest release of the EJB specification is Public Final Draft 2, which was released at the end of April. The latest incarnation of the EJB specification has a varie... (more)