IBM Version 5 manual Customer Registration application, XML in this application

￿The database that will be used and how to interact with it.

EJBs have been designed to provide a framework in which reusable business logic components can be created without an understanding of the infrastructure or a concern for where the components will be deployed. And with EJBs, it's simple to reuse code in other applications once it's been developed to implement part of a process. (Most business processes can be broken down into a number of distinct parts, and some of these parts will be common to multiple applications.)

The simple answer is that EJBs are a server-side component architecture. They enable a developer to create a component that represents a discrete, well-defined piece of functionality. Since the interfaces to the component can be published to other developers, the component can easily be combined with other components to create a complete application.

In both applications wizards have been extensively used and custom code has been kept to a minimum. The wizards, by generating the required files, pages and code, help to jump start the development of the applications while reducing the learning curve for the developer. They complexity of creating some of the files is hidden behind from the developer, allowing him more time on customizing the application.

8.5 The Customer Registration application

The Customer Registration application was developed to demonstrate Application Developer’s capabilities in the JavaBeans and Enterprise JavaBeans area. As in any such similar system, there are always two components: The first called Customer Registration, and the second Customer Retrieval for retrieving information about the customer that has been registered. The data is prompted through a Web page and stored in the database. For this application, the database has a single table and four fields: First Name, Last Name, E-mail, and Membership number.

8.5.1 XML in this application

XML plays a key advantage in this application. In this application, XML is used as follows:

￿Generating of XML from JavaBeans through a wizard. This creates the XML and XSL accessing JavaBeans. This produces the input and output XSL forms.

￿Uses Sun’s Java API for XML Processing (JAXP) to produce the XML data from the JavaBean.

174 The XML Files: Development of XML/XSL Applications Using WebSphere Studio