In Chapter 10, I showed you how to create web pages using JSF components. However, drawing pages with graphical components is not enough; these pages need to interact with a back-end system, navigate through other pages, and also validate and convert data. JSF is a rich specification: backing beans allow you to invoke the business tier and to navigate in your application. A set of classes allows you to convert component values to and from a corresponding type or validate them to conform to business rules. Integration with Bean Validation also facilitates validation in JSF 2.2. With the use of annotations, it is now easy to develop backing beans, custom converters, and customer validators.