How Does the JSF MVC Framework Separate Model, View, and Controller Components Across Different Contexts?

Differentiating MVC Components in JSF MVC Framework

The JSF MVC framework is a three-tier architecture that separates logic into distinct components. These components include the Model, View, and Controller (MVC), each playing specific roles.

MVC in the Architectural Context:

From a broader architectural perspective, the JSF code itself typically serves as the View (V). The Model (M) comprises the business logic and data access layers (e.g., EJB, JPA, DAO), while the Controller (C) is represented by the FacesServlet.

MVC in the Developer Perspective:

Within the developer's scope, the architectural View (V) is further divided into:

• Model: Entity
• View: Facelets/JSP page
• Controller: Managed bean

MVC in the Client Runtime:

At the client runtime, the developer View (V) is further segmented into:

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

MVC in JavaScript Micro-context:

In the JavaScript micro-context within the client, the client View (V) is again divided:

• Model: HTML DOM tree
• View: Visual presentation
• Controller: Event listener functions (enduser interaction and Ajax)

Note on Design Considerations:

It's important to maintain a clean separation between components to adhere to the MVC design principles. Mixing properties from entities into managed beans (controller as model) should be avoided to prevent poor design practices.

References for Deeper Understanding:

For further insights into the MVC architecture in JSF, refer to the code snippets and discussions in the following resources:

• JSF Controller, Service, and DAO
• Creating Master-Detail Pages for Entities
• Passing a JSF2 Managed POJO Bean into EJB
• Filter Do Not Initialize EntityManager
• javax.persistence.TransactionRequiredException in Small Facelet Application

Additionally, the book "The Definitive Guide to JSF in Java EE 8" provides a helpful Venn diagram illustrating the position of the backing bean within the MVC paradigm (Copyright disclaimer: This book is authored by the same individual providing this answer).

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