A web application consists of web components, static resource files such as images, and helper classes and libraries. The web container provides many supporting services that enhance the capabilities of web components and make them easier to develop. However, because a web application must take these services into account, the process for creating and running a web application is different from that of traditional stand-alone Java classes.
Server-side utility classes (database beans, shopping carts, and so on). Often these classes conform to the JavaBeans component architecture.
Client-side classes (applets and utility classes).
Web applications are configured via elements contained in the web application deployment descriptor. The deploytool utility generates the descriptor when you create a WAR and adds elements when you create web components and associated classes. You can modify the elements via the inspectors associated with the WAR.
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