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Challenges of Application Development for the Enterprise
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The ability to develop and deploy applications is a key to success in the information economy. Applications must go quickly from prototype to production, and they must continue evolving even after they have been deployed. Productivity, therefore, is vital to responsive application development. JEE provides application development teams with a set of standard application programming interfaces (APIs) that is, the means to access the services required by multi-tier applications and standard ways to support a variety of clients. This can contribute to both responsiveness and flexibility. In contrast to data access that is standardized and stabilized by SQL, a destabilizing factor in Internet and other distributed computing applications is the divergence of programming models. Historically (in web terms), technologies such as Hypertext Markup Language (HTML) have provided a front-end mechanism for distributing dynamic content, while back-end systems such as transaction processors are based on IBM Customer Information Control System (CICS), Tuxedo, IBM Message Queuing (MQ), Lotus Notes, and other data access systems. These technologies present a diversity of nonstandard programming models based on proprietary architectures. With no single standard for application models, it is difficult for architecture, development, and production teams to communicate application requirements effectively and productively. As a result, the process of architecting applications is extremely complex. What s more, the skill sets required to integrate these technologies are not organized well for an effective division of labor. Another complicating factor in application development time is the client type. Although many applications can be distributed to web browser clients through static or dynamically generated HTML, others may need to support a specific type of client or several types of clients simultaneously (for example, WAP, or Wireless Application Protocol). The programming model should support a variety of client configurations with minimal consequence to basic application architecture or the core business logic of the application. JEE enables development to be role oriented. Components are architected by one group, developed and assembled by another, and deployed by still another.
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Imagine a multilocation retail business trying to increase its customer base by a factor of 10. How much time and effort would be expended on remodeling storefronts, building new warehouses, and so on, to keep up Realistically, constant rework would impact the business ability to serve its customers.
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1: Sun Certification for the Enterprise Architect
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This holds for businesses in the e-commerce arena as well. The ability to architect applications that scale easily to accommodate growth is critical to achieving the company s goals. To scale effectively, systems require mechanisms to ensure efficient management of system resources and services such as database connections and transactions. They need access to features such as automatic load balancing without any effort on the part of the application developer. Applications should be able to run on any server appropriate to anticipate client volumes and to switch server configurations easily when the need arises. JEE-compliant application servers such as WebSphere and WebLogic provide these features in the form of database pooling, server clustering, and fail-over functionality.
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The Architect Must Be Able to Integrate JEE and Legacy Systems
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In many enterprises, the data of value to organizations, also called books and records, has been collected over the years by existing information systems. The investment resides in applications on those same systems. The business rules, the procedures, and Y2K code all work, perform the business functionality properly, and cost a great deal of time and money to produce. The challenge for developers of enterprise applications is how to reuse and capitalize on this value by betting on middleware, which can converse with the legacy systems. Architects need to use the JEE standard to help application developers by providing standard ways to access middle-tier and back-end services such as database management systems and transaction monitors.
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