Spring relies on its Spring MVC framework to support REST APIs. The concept of Model-View-Controller (MVC) was introduced in the the seventies at Xerox Parc. MVC pattern makes an attempt to modularize software by isolating different functional units from each other. It separates application domain/data (model) from the display of the application state (view) and the interaction with the model and view (controller).

This example covers Togglz integration which JSF, Primefaces, and Spring. The example web application displays customer information based on the state of the toggle/flag. The customer’s address is only displayed if the toggle/flag is enabled. The flag can be enabled and disabled from the Togglz administration console. You can find the source code here.

Any non-trivial software is composed of many different parts. Some of these parts can be grouped together to form a software feature – a unit of functionality that satisfies a requirements or business needs.