BEA WebLogic
BEA WebLogic Server is a fully-featured, standards-based application server providing the foundation on which an enterprise can build reliable, scalable, and manageable applications. With its comprehensive set of features, compliance with open standards, multi-tiered architecture, and support for component-based development, WebLogic Server provides the underlying core functionality necessary for the development and deployment of business-driven applications
The BEA WebLogic Enterprise Platform delivers a single, integrated platform for building and integrating applications as end-to-end business processes. It also converges integration and development. The BEA WebLogic Enterprise Platform also delivers a quantum leap in ease of development and integration, on an industrial-strength platform-independent foundation. By making the power of J2EE accessible to a significantly broader developer base, your organization can fully leverage all of your IT resources to realize increased productivity. Now, developers whose skills include Visual Basic, Cobol, PowerBuilder, and other tools, have the ability to use their skills in developing enterprise applications that exploit the full power of J2EE and industry standard Web services.
IBM WebSphere
The WebSphere brand represents a platform for today's e-business applications. The WebSphere vision and direction represent an ongoing strategy and vision about how software will evolve and meet future application needs. WebSphere is an application server that runs business applications and supports the J2EE and web services standards. It is a place to host business and presentation logic, which can integrate into the existing computing infrastructure of small as well as large organizations.
Application servers provide a place to execute policies, to enforce terms and conditions, and to apply business rules. Global clients commonly access these engines using browsers and pervasive devices that operate on both static and dynamic content. The web server sits between the browser and the application server in the most common topologies. Static content is normally served directly from the web server while dynamic content requests are passed on to the application server. Content can be cached at the edge of the network to drastically reduce both network traffic and system load. "Edge Services" refers to the WebSphere capabilities that work in conjunction with the web server to provide this caching at the edge of the network.
Of course, the application servers are not islands, as they typically need to access persistent information stored in one or more databases. In addition, existing systems and applications often need to be leveraged as part of an e-business solution; messaging technology and message brokering are frequently used to drive such legacy system interactions.
How does the application server perform these tasks?The application server, through the services that it provides, handles the presentation and business logic. As the J2EE standards have matured and web services standards have quickly emerged, more services are inherently part of the application server.
Application servers also contain messaging capabilities via the Java Messaging Service (JMS). JMS and the additional messaging features of WebSphere 5.0 provide further evidence for the fact that the asynchronous and synchronous programming models are both required to build next generation applications. The application server provides these features and functions for environments where existing infrastructure is not in place, or where the features need to be more tightly integrated and managed by the application server.
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