Tyler Jewell

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 variety of features that developers should become familiar with: The introduction of message-driven beans The creation of a new entity EJB container-managed persistence model A model for creating container-managed relationships between entity EJBs The creation of a standard query language, EJB-QL, for querying EJBs and their properties The introduction of local interfaces for session and en... (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)

Understanding the WebLogic Workshop Architecture

I was goofing off this weekend, trying to figure out what would be the best topic to write about for this month's architecture column. And, like any good columnist, I procrastinated until Sunday night (the article was due on Monday morning). Right on time! While sitting at my computer, I couldn't help but wander off to random Web sites and all the while I was instant messaging a complete ... (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)

The Business Transaction Protocol

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 infra... (more)