JSF Interview Questions
- What does component mean and what are its types?
Components in JSF are elements like text box,
button, table etc. that are used to create user interfaces of JSF
Applications. These are objects that manage interaction with a user.
Components help developers to create UIs by
assembling a number of components , associating them with object
properties and event handlers. Would u like to repeat the same code again
& again and waste time if u want to create many tables in hundreds of
pages in your web application? Not at all. Once you create a component,
it?s simple to drop that component onto any JSP.
Components in JSF are of two types :
- Simple Components like text box, button and
- Compound Components like table, data grid
A component containing many components inside it
is called a compound component.
JSF allows you to create and use
components of two types:
JSF contains its basic set of UI components like text
box, check box, list boxe, button,
label, radio button, table, panel
etc. These are called standard components.
Generally UI designers need some different , stylish
components like fancy calendar, tabbed panes . These types of
components are not standard JSF components. JSF provides this
additional facility to let you create and use your own set of
reusable components. These components are called custom components.
- What are third party components and how they are useful?
One of the greatest power of JSF is to support third party
components . Third party components are custom components created by
another vendor. Several components are available in the market, some of
them are commercial and some are open source . These pre-built &
enhanced components can be used in UI of your web application. For
example, we are in need of a stylish calendar then we have an option to
take it from third party rather than creating it our own. This will help
saving time & cost creating effective & robust UI and to
concentrate on business logic part of web application.
- What are tags in JSF ?
JSF application typically uses JSP pages to represent views. JSF
provides useful special tags to enhance these views. Each tag gives rise
to an associated component. JSF (Sun Implementation) provides 43 tags in
two standard JSF tag libraries:
JSF Core Tags Library
JSF Html Tags Library
Even a very simple page uses tags from both libraries.
These tags can be used adding the following lines of code at the head of
<%@ taglib uri=?http://java.sun.com/jsf/core
? prefix=?f? %> (For Core Tags)
<%@ taglib uri=?http://java.sun.com/jsf/html
? prefix=?h? %> (For Html Tags)
- What is the difference between JSP and JSF?
JSP simply provides a Page which may contain markup, embedded Java code, and
tags which encapsulate more complicated logic / html.
JSF may use JSP as its template, but provides much more. This includes
validation, rich component model and lifecycle, more sophisticated EL,
separation of data, navigation handling, different view technologies
(instead of JSP), ability to provide more advanced features such as AJAX,