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RichFaces Interview Questions and Answers

Ques 1. What is RichFaces?

RichFaces is a JSF component library that consists of two main parts: AJAX enabled JSF components and the CDK (Component Development Kit). RichFaces UI components are   divided into two tag libraries a4j: and rich:. Both tag libraries offer out-of-the-box AJAX enabled JSF components. The CDK is a facility for creating, generating and testing you own rich JSF components.

  • A full set of AJAX enabled components in two libraries
    • a4j: page centric AJAX controls
    • rich: self contained, ready to use components
  • Client-side validation, expanding JSR 303 Bean Validation all the way to the browser.
  • Advanced queueing to match the high performance requirements of real world enterprise applications.
  • Push component upgrades including JavaMessaging Service (JMS) integrations, and various transport mechanisms based on browser support.
  • Our own Component Development Kit (CDK).
  • Comprehensive documentation covering development best practices, and component details.
  • Detailed and automated testing facilities for components, actions, listeners, and pages.
  • Broad cross-browser support
  • Large and active community at its foundation!!

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Ques 2. What is <a4j:support> tag?

Sends an AJAX request based on a DHTML event supported by the parent component.  In this example, the AJAX request will  be triggered after the user types a character in the text box:

<h:inputText value="#{document.docOrigtor}" id="docClaimOrigId" binding="#{handler.docOrig}">
  <a4j:support actionListener="#{handler.createDocumentName}" event="onkeyup" reRender="docId"/>
Here, on keyup event it will call handler.createDocumentName method with ajax call and rendering docId value.

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Ques 3. What are the basic configurations of web.xml for Rich Faces?

Configuration of web.xml while you are using RichFaces in your application:

        <display-name>RichFaces Filter</display-name>
        <servlet-name>Faces Servlet</servlet-name>

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Ques 4. How to control traffic in RichFaces?

Controlling traffic can be done using Queues mechanism.
Queues can be defined using <a4j:queue…../>
3 types of queues are there: Named, Unnamed, and Global queue.

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Ques 5. How to keep a managed bean between requests?

 The bean class should be implemented by Serializable.

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