Introduction to JSF Interview Questions and Answers
JSF (Java Server Faces) is a Java Specification provided by the Oracle Corporation under Java Specifications Group and it was completely written in Java programming language. JSF is used for building web pages or User Interfaces based on the components and was a standard from the Java Community Process which was a part of the Java Enterprise Edition Platform. It is a kind of web application framework which will be used along with the Java technologies to develop web applications where the user interfaces are required. The developed JSF pages can be deployed on any kind of web application servers that are compliant with Java Enterprise Edition.
JSF has stable releases periodically from the Oracle and the specifications are available and hosted on the Github repository site. The original specification request for the JSF was proposed in the year 2001.
Now, if you are looking for a job that is related to JSF then you need to prepare for the 2021 JSF Interview Questions. It is true that every interview is different as per the different job profiles but still to clear the interview you need to have a good and clear knowledge of JSF. Here, we have prepared the important JSF Interview Questions and Answers which will help you get success in your interview.
In this 2021 JSF Interview Questions article, we shall present 10 most important and frequently used JSF interview questions. These questions will help students build their concepts around JSF and help them ace the interview.
Part 1 – JSF Interview Questions (Basic)
This first part covers basic Interview Questions and Answer.
1. What is JSF and what is it used for?
JSF is a Java Server Faces technology and a user interface framework for developing the web applications and is a component-based technology to develop the UI components which was developed and the specification was given by Java Community Process. It is being maintained by the Oracle for its stable releases and maintenance. This framework was developed based on the MVC (Model View Controller) pattern where this framework stands at V-View which is used to display the user interfaces based on the request processed by the controller and the data available with the Model.
2. What are the features of JSF?
The different features of JSF are –
- It is a standard UI framework developed by Oracle to develop user interfaces.
- A component-based UI framework.
- Event handling and navigation model.
- Different tools and application servers support.
- RAD – Rapid Application Development.
- Developed on top of the Servlet AP (Web components API specification)
- Easy to use third-party components
- Easy to integrate with third-party tools.
3. What are the applications of JSF?
The different types of applications of JSF are – it can be used to develop web applications easily and in an organized way. There are different security features and performance and tuning operations those can be carried out within the application or web server to improve the performance of a web application. Different kinds of bean elements can be managed.
4. What is the lifecycle of a JSF?
This is the basic JSF Interview Questions asked in an interview. The lifecycle of JSF involves different phases such as below
- Restore View
- Apply Requests
- Process Events
- Process Validations
- Update Model Values
- Process Events
- Invoke Application
- Process Events
- Render response
Where the input and output of a lifecycle will be Faces Request and Faces Response from a web application server.
5. What are the different JSF events?
The different JSF events existing are Action Events, Value Change Events, and Phase Events. The action events are a kind of handling UI button or click changes in the user interface modules or components. All the types of clicks can be handled in action events. The value change events can be any type of updating the values from UI page such as radio buttons, text fields, dropdowns etc. The Phase events are a kind of events where a triggered will be fired during either the start of the lifecycle phase or at the end of the lifecycle phase.
Part 2 – JSF Interview Questions (Advanced)
Let us now have a look at the advanced Interview Questions and Answers
6. What the important elements of the JSF architecture?
The JSF architecture contains different elements such as UI components which are presented as stateful objects on the server-side, builder or helper classes and its validators, navigation handlers and event handlers. The application configuration and resource files for configuring the application resources to manage the JavaBeans components as models and its containing application-specific behavior or functionalities. The custom tags library is available for representing the event handlers & validators. A custom tag library is also available for rendering the UI components. A Faces Servlet will exist to manage the Client requests and Server responses and also to manage the JSF view pages and managed beans and also a persistence framework in the behind to integrate with the database to the web application.
7. What is Backing Bean in JSF?
The Backing beans in JSF are the Java Beans which are used to implement the UI or front end logic in order to manage the data flow between the business tier and web server tier. Ideally, one backing bean does exist for each JSF page. In JSF 1.2 version, a managed bean should be registered in JSF configuration file facesconfig.xml in order to make it functional. From JSF 2.0 version onwards the same configuration can be avoided and Annotations can be used to apply this configuration.
8. What are the page navigation rules in JSF?
The JSF specification has its own set of rules specified in navigating the pages in JSF. They are such as which view has to be displayed or redirected based on the clicked button or the link on the previous web or JSF page. A set of navigation rules exist in order to redirect the pages and render the data content on to the web page of the device browser.
9. What are the different scopes in JSF?
This is the advanced JSF Interview Questions asked in an interview. The different scopes available in JSF are Application scope, Session scope, and View Scope. The application scope is used across the application to persist in the interaction of the users in the entire application. The Session scope is across the different HTTP requests in the application and View Scope is used to persist in an interaction of a user with a single JSF page or view of the application. The different annotations used are as below.
- Application Scope: @ApplicationScoped
- Session Scope: @SessionScoped
- View Scope: @ViewScoped
10. What are the facelet tags available in JSF?
The different facelet tags available are as below:
This has been a guide to the list of JSF Interview Questions and Answers so that the candidate can crackdown these Interview Questions easily. Here in this post, we have studied top JSF Interview Questions which are often asked in interviews. You may also look at the following articles to learn more –