Saurabh Dixit

The concept of persisting a user session during the interaction with an application server has matured from maintaining hidden HTML fields and toying with URLs to a stable and robust technology under the J2EE framework. This is what is commonly referred to as an HTTP session - a conversation that spans multiple requests between a client and the server. The session could be maintained at the various layers on the application architecture. It could reside on the client, on the presentation layer, in the object layer, or even in the database layer of the application. There are two options for maintaining client sessions when session data resides on the client layer. Session information can be maintained in hidden HTML fields or, alternatively, via the use of cookies, which are maintained on the client. This strategy has some inherent limitations, such as only String val... (more)

Using Web Services with J2EE

By now, every Java developer and architect has heard the words "Web service." Loosely, a Web service can be described as any business enterprise asset enabled for access over the Web. There's a need to make applications accessible independently of the technologies used in the enterprise. The goal is to gain interoperability among distributed systems spanning diverse hardware and software platforms. SOAP and WSDL are XML-based standards that have made it possible to achieve this goal. SOAP facilitates development of heterogeneous distributed applications by providing a standardize... (more)