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S Sangeetha

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The Java Platform Enterprise Edition 7 specification early draft is available for download. All these years the focus was to introduce several APIs and technologies as part of the platform to make it more powerful, simple and complete. This is the first time the focus has shifted in a completely different direction - to bring in something new to the platform, apart from the enhancements to the existing technologies. In this article, we'll look at how Java EE evolved, became a major platform specification and understand the direction in which it is moving forward. Java EE - Past A brief look at the history of the Java EE - Java Platform Enterprise Edition specification reveals that every major release of the specification has been driven by a major theme. A look at the specification details reveals that the theme for the first release of the specification J2EE 1.2 wa... (more)

Component Models in Java | Part 1

A component is a reusable software entity. A component is a deployable piece of software that can be independently developed and maintained. In the previous article -Componentizing a Monolithic Application in Java, we discussed the need for componentizing applications to get the benefits of reusability and modularity. We also looked at how an E-Store application can be componentized using a simple component model developed by the authors using a factory whiteboard pattern and a simple repository. In Part 1 of this article we will try to understand various component models in Jav... (more)

Componentizing a Monolithic Application in Java

Component-oriented development has many architectural advantages. In spite of this, many developers tend to solve problems the monolithic way on the first go. This article demonstrates how a monolithic design can be modified to achieve component-based design. During this conversion process, the necessity of Component Models and Frameworks are highlighted. The article demonstrates the componentization of an example monolithic application using a simple homegrown component model and framework developed by the authors. Introducing E-Store - A Business Application Let us assume that w... (more)

Componentizing Applications with Layered Architecture

A component is a reusable software entity that is developed and deployed independently. Component based software development has many architectural advantages. In the previous article Componentizing a Monolithic Application in Java, we learnt the need for componentizing applications for getting the benefits of reusability and modularity. In this article let us look at how multi layered application can be componentized. We take the example of a multi-layered POS (Point-Of-Sale) application and understand how the application can be componentized at various layers like presentation,... (more)

Part 3 | Component Models in Java

Service Component Architecture (shortly referred as SCA) is a technology for creating services from components. SCA is a set of OASIS standards and part of it is developed with the collaboration of vendors from open source community, referred as "OSOA" Open SOA. SCA helps to build systems as a collection of interconnected components. The components created in SCA communicate through the services. The advantage of SCA is its neutral component model. It allows services to be built by any language component like Java, C++, BPEL, JavaScript, Ruby, Python etc. SCA addresses two impo... (more)