How Do the Model, View, and Controller Components Interact in the JSF MVC Framework?

Understanding the MVC Components in JSF MVC Framework

The Model-View-Controller (MVC) design pattern plays a crucial role in the JSF MVC framework. To comprehend the MVC components in JSF, it's essential to consider the perspective from which they are being viewed.

From a broader architectural perspective, the JSF code itself represents the View (V). The Model (M) comprises the business domain or service layer (e.g., EJB/JPA/DAO), while the Controller (C) is the FacesServlet.

From a developer's viewpoint, the architectural View (V) can be further divided into:

• Model (M): Entities
• View (V): Facelets/JSP pages
• Controller (C): Managed beans

Delving deeper into the client perspective, the developer View (V) can be further broken down:

• Model (M): JSF component tree
• View (V): Rendered HTML output
• Controller (C): Client (webbrowser)

Moving even further into the JavaScript realm, the client View (V) can be further divided:

• Model (M): HTML DOM tree
• View (V): Visual presentation
• Controller (C): Event listener functions (user interaction and Ajax)

Therefore, it's essentially a M(M(M(MVC)C)C)C architecture.

It's important to note that mingling entity properties in the managed bean, as occasionally observed in introductory tutorials, leads to poor design, compromising the clean MVC structure. The code snippets in the provided answers illustrate the correct MVC approach, effectively segregating the Model, View, and Controller components in the JSF MVC framework.

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