JSF Interview Questions and Answers for 10 years experience

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100 JSF Interview Questions and Answers (10 Years Experience)

  1. What is JSF? Explain its architecture.

    • Answer: JavaServer Faces (JSF) is a Java-based framework for building user interfaces for web applications. Its architecture is based on a component-based model. Key components include:
    • Faces Servlet: The central controller, handling all requests and responses.
    • JSF Application: Manages the application's lifecycle and resources.
    • UI Components: Reusable UI elements like input fields, buttons, and tables.
    • Renderers: Translate UI components into HTML or other markup languages.
    • Value Binding: Connects UI components to backing bean properties.
    • Event Handling: Manages user interactions with components.
    • Managed Beans: Java beans that hold application data and logic.
    • Expression Language (EL): Simplifies access to data and manipulation within JSF pages.
    • Navigation: Defines how users move between different pages.

  2. Explain the JSF lifecycle.

    • Answer: The JSF lifecycle consists of several phases: Restore View, Apply Request Values, Process Validations, Update Model Values, Invoke Application, Render Response. Each phase performs specific tasks, processing user input and updating the UI.

  3. What are managed beans in JSF? How are they configured?

    • Answer: Managed beans are JavaBeans that hold application data and business logic. They are configured using annotations (like `@ManagedBean`, `@RequestScoped`, `@SessionScoped`, etc.) in the managed bean class or in a configuration file (e.g., `faces-config.xml`).

  4. What are the different scopes available for managed beans?

    • Answer: Common scopes include `@RequestScoped`, `@SessionScoped`, `@ApplicationScoped`, `@ViewScoped`, `@CustomScoped` (requires custom implementation). Each scope defines the bean's lifetime.

  5. Explain the difference between `@RequestScoped`, `@SessionScoped`, and `@ApplicationScoped` beans.

    • Answer: `@RequestScoped` beans live for a single request; `@SessionScoped` beans live for the duration of a user's session; `@ApplicationScoped` beans live for the entire application's lifetime.

  6. What is the Expression Language (EL) in JSF? Give examples.

    • Answer: EL is a simple language used to access and manipulate data within JSF pages. Examples: `${user.name}`, `${users[0].age}`. It simplifies data binding and reduces the need for scriptlets.

  7. What is the purpose of the `faces-config.xml` file?

    • Answer: `faces-config.xml` is the JSF configuration file. It's used to configure managed beans, navigation rules, custom components, and other aspects of the JSF application.

  8. How do you handle validation in JSF?

    • Answer: Validation in JSF can be done using built-in validators, custom validators, or by using JSR 303 Bean Validation annotations (`@NotNull`, `@Size`, etc.).

  9. Explain the concept of converters in JSF.

    • Answer: Converters transform data between the UI component's type and the backing bean's type. For example, converting a String to a Date.

  10. What are custom validators and converters, and why would you use them?

    • Answer: Custom validators and converters extend JSF's capabilities beyond the built-in options, allowing you to handle complex validation rules and data transformations specific to your application.

  11. [Question 11]

    • Answer: [Answer 11]

  12. [Question 12]

    • Answer: [Answer 12]

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