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On Demand Stateful EJB
Enterprise JavaBeans' (EJB) are the de facto standard when it comes to server side components developed in J2EE. Session beans are used for business logic components and are primarily of two types - Stateful and Stateless. The type of the bean - stateful or stateless is decided at deployment time through some deployment parameters. There are many scenarios where the decision of needing a stateful bean can be deferred until runtime. The article explains a pattern that can be used to dynamically choose a stateful bean at runtime.
About the AuthorSwaminathan Radhakrishnan works as a Technical Architect with Infosys Technologies, Ltd. He has been involved with J2EE since its inception.
Migrating Enterprise Applications Between J2EE Application Servers
This article covers the aspects of enterprise application migration that involve J2EE application servers, including the motivation, methodology, challenges, and the way to successfully undertake such an initiative. The focus is primarily on the migration of a large portfolio of applications, not individual applications. This article doesn't get into the basics of application server technologies, Java technologies, etc.; I feel it will be of most interest to architects, team leads, and technical project managers.
About the AuthorAjit Sagar is a Senior Technical Architect with Infosys Technologies. Ajit has served as Java Developer's Journal's (JDJ) J2EE editor and was the founding editor of the Extensible Markup Language (XML) Journal.
Web Based Application Security
Web-based business applications need stringent security regulations. Within an application, each different role requires a predetermined set of access rights. This article explains how you can use Struts, taglibs, and servlet filters to develop a powerful and flexible security model that can be used directly by almost any Web-based business application.
About the AuthorSwaminathan Radhakrishnan works as a Technical Architect with Infosys Technologies, Ltd. He has been involved with J2EE since its inception.
Take Two Patterns and Call Me in the Morning
Life is not easy for today's enterprise application architects. In today's IT world, the architect not only has to design solutions for a plethora of interdependent systems (as is obvious from the job description and title), he or she also has to conform to the ever-evolving standards in a shorter Application Program Interface (API) lifecycle, plan for the not-too-distant future, collaborate with business and technical environments, and work on a feasible roadmap for his or her application/ application portfolio.
About the AuthorAjit Sagar is a Senior Technical Architect with Infosys Technologies. Ajit has served as JDJ's J2EE editor and was the founding editor of XML-Journal.
HTTP Session Garbage Collector
A common approach to caching data in Web applications is to use an HyperText Transport Protocol (HTTP) session. A business use case that spans multiple HTTP requests may create the need for caching in a Web tier. Once business use case processing is completed, this cached data needs to be removed.
About the AuthorAbinasha Karana is a Technical Architect with the Enterprise Mobility Solutions Group at Infosys. His area of interest is implementing solutions for mobile platforms.