Running your first JSF 2.3 code 

JavaServer Faces (JSF) is the Java technology made to simplify the process of building a UIs, despite how it's made for the frontend and the UI is built in the backend.

With JSF, you can build components and use (or reuse) them in the UI in an extensible way. You can also use other powerful APIs, such as CDI and Bean Validation, to improve your application and its architecture.

In this recipe, we will use the Validator and Converter interfaces with the new feature introduced by version 2.3, which is the possibility of using them with generic parameters.