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Freshers / Beginner level questions & answers

Ques 1. What is JSF?

JSF stands for Java Server Faces. JSF has set of pre-assembled User Interface (UI). By this it means complex components are pre-coded and can be used with ease. It is event-driven programming model. By that it means that JSF has all necessary code for event handling and component organization. Application programmers can concentrate on application logic rather sending effort on these issues. It has component model that enables third-party components to be added like AJAX.

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Ques 2. What is required for JSF to get started?

Following things required for JSF:

  • JDK (Java SE Development Kit)
  • JSF
  • Application Server (Tomcat or any standard application server)
  • Integrated Development Environment (IDE) Ex. Netbeans 5.5, Eclipse 3.2.x, etc.
Once JDK and Application Server is downloaded and configured, one can copy the JSF jar files to JSF project and could just start coding. If IDE is used, it will make things very smooth and will save your time.

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Ques 3. What is JSF architecture?

JSF was developed using MVC (Model View Controller) design pattern so that applications can be scaled better with greater maintainability. It is driven by Java Community Process (JCP) and has become a standard. The advantage of JSF is that it has both a Java Web user and interface and a framework that fits well with the MVC. It provides clean separation between presentation and behavior. UI (User Interface) can be created by page author using reusable UI components and business logic part can be implemented using managed beans.

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Ques 4. How JSF different from conventional JSP / Servlet Model?

JSF much more plumbing that JSP developers have to implement by hand, such as page navigation and validation. One can think of JSP and servlets as the assembly languages under the hood of the high-level JSF framework.

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Ques 5. How the components of JSF are rendered? An Example

In an application add the JSF libraries. Further in the .jsp page one has to add the tag library like:
<%@ taglib uri="http://java.sun.com/jsf/core" prefix="f"%>

<%@ taglib uri="http://java.sun.com/jsf/html" prefix="h"%>

Or one can try XML style as well:
<?xml version="1.0"?> <jsp:root version="2.0" xmlns:jsp="http://java.sun.com/JSP/Page" xmlns:f="http://java.sun.com/jsf/core" xmlns:h="http://java.sun.com/jsf/html">

Once this is done, one can access the JSF components using the prefix attached. If working with an IDE (Integrated Development Environment) one can easily add JSF but when working without them one also has to update/make the faces-config.xml and have to populate the file with classes i.e. Managed Beans between
<faces-config> </faces-config> tags

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Ques 6. How to declare the Navigation Rules for JSF?

Navigation rules tells JSF implementation which page to send back to the browser after a form has been submitted. For ex. for a login page, after the login gets successful, it should go to Main page, else to return on the same login page, for that we have to code as:

<navigation-rule>
<from-view-id>/login.jsp</from-view-id>
<navigation-case>
<from-outcome>login</from-outcome>
<to-view-id>/main.jsp<to-view-id>
</navigation-case>
<navigation-case>
<from-outcome>fail</from-outcome>
<to-view-id>/login.jsp<to-view-id>
</navigation-case>
</navigation-rule>

from-outcome to be match with action attribute of the command button of the login.jsp as:

<h:commandbutton value="Login" action="login"/>
Secondly, it should also match with the navigation rule in face-config.xml as


<managed-bean>
<managed-bean-name>user</managed-bean-name>
<managed-bean-class>core.jsf.LoginBean</managed-bean-class>
<managed-bean-scope>session</managed-bean-scope>
</managed-bean>
In the UI component, to be declared / used as:


<h:inputText value="#{user.name}"/>
value attribute refers to name property of the user bean.

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Ques 7. How do I configure the configuration file?

The configuration file used is our old web.xml, if we use some IDE it will be pretty simple to generate but the contents will be something like below:


<?xml version="e;1.0"e; encoding="e;UTF-8"e;?>
<web-app version="e;2.4"e; xmlns="e;http://java.sun.com/xml/ns/j2ee"e;
xmlns:xsi="e;http://www.w3.org/2001/XMLSchema-instance"e;
xsi:schemaLocation="e;http://java.sun.com/xml/ns/j2ee
http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"e;>
<context-param>
<param-name>com.sun.faces.verifyObjects</param-name>
<param-value>false</param-value>
</context-param>


<context-param>
<param-name>com.sun.faces.validateXml</param-name>
<param-value>true</param-value>
</context-param>


<context-param>
<param-name>javax.faces.STATE_SAVING_METHOD</param-name>
<param-value>client</param-value>
</context-param>


<servlet>
<servlet-name>Faces Servlet</servlet-name>
<servlet-class>javax.faces.webapp.FacesServlet</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>


<servlet-mapping>
<servlet-name>Faces Servlet</servlet-name>
<url-pattern>/faces/*</url-pattern>
</servlet-mapping>


<session-config>
<session-timeout>
30
</session-timeout>
</session-config>


<welcome-file-list>
<welcome-file>
index.jsp
</welcome-file>
</welcome-file-list>
</web-app>

The unique thing about this file is ?servlet mapping?. JSF pages are processed by a servlet known to be part of JSF implementation code. In the example above, it has extension of .faces. It would be wrong to point your browser to http://localhost:8080/MyJSF/login.jsp, but it has to be http://localhost:8080/MyJSF/login.faces. If you want that your pages to be with .jsf, it can be done with small modification :-),

<servlet-mapping>
<servlet-name>Faces Servlet</servlet-name>
<url-pattern>*.jsf</url-pattern>


<servlet-mapping>

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Ques 8. How does JSF depict the MVC (Model View Controller) model?

The data that is manipulated in form or the other is done by model. The data presented to user in one form or the other is done by view. JSF is connects the view and the model. View can be depicted as shown by:


<h:inputText value="#{user.name}"/>
JSF acts as controller by way of action processing done by the user or triggering of an event. For ex.

<h:commandbutton value="Login" action="login"/>
this button event will triggered by the user on Button press, which will invoke the login Bean as stated in the faces-config.xml file. Hence, it could be summarized as below: User Button Click -> form submission to server ->; invocation of Bean class ->; result thrown by Bean class caught be navigation rule ->; navigation rule based on action directs to specific page.

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Ques 9. What does it mean by rendering of page in JSF?

Every JSF page as described has various components made with the help of JSF library. JSF may contain h:form, h:inputText, h:commandButton, etc. Each of these are rendered (translated) to HTML output. This process is called encoding. The encoding procedure also assigns each component with a unique ID assigned by framework. The ID generated is random.

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Ques 10. What is JavaServer Faces?

JavaServer Faces (JSF) is a user interface (UI) framework for Java web applications. It is designed to significantly ease the burden of writing and maintaining applications that run on a Java application server and render their UIs back to a target client. JSF provides ease-of-use in the following ways:

  • Makes it easy to construct a UI from a set of reusable UI components
  • Simplifies migration of application data to and from the UI
  • Helps manage UI state across server requests
  • Provides a simple model for wiring client-generated events to server-side application code
  • Allows custom UI components to be easily built and re-used


Most importantly, JSF establishes standards which are designed to be leveraged by tools to provide a developer experience which is accessible to a wide variety of developer types, ranging from corporate developers to systems programmers. A "corporate developer" is characterized as an individual who is proficient in writing procedural code and business logic, but is not necessarily skilled in object-oriented programming. A "systems programmer" understands object-oriented fundamentals, including abstraction and designing for re-use. A corporate developer typically relies on tools for development, while a system programmer may define his or her tool as a text editor for writing code. Therefore, JSF is designed to be tooled, but also exposes the framework and programming model as APIs so that it can be used outside of tools, as is sometimes required by systems programmers.

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Ques 11. How to pass a parameter to the JSF application using the URL string?

if you have the following URL: http://your_server/your_app/product.jsf?id=777, you access the passing parameter id with the following lines of java code:

FacesContext fc = FacesContext.getCurrentInstance();
String id = (String) fc.getExternalContext().getRequestParameterMap().get("id");
From the page, you can access the same parameter using the predefined variable with name param. For example,

<h:outputText value="#{param['id']}" />
Note: You have to call the jsf page directly and using the servlet mapping.

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Ques 12. How to add context path to URL for outputLink?

Current JSF implementation does not add the context path for outputLink if the defined path starts with '/'. To correct this problem use #{facesContext.externalContext.requestContextPath} prefix at the beginning of the outputLink value attribute. For For Example:

<h:outputLink value=”#{facesContext.externalContext.requestContextPath}/myPage.faces”> 



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Ques 13. How to get current page URL from backing bean?

You can get a reference to the HTTP request object via FacesContext like this:

FacesContext fc = FacesContext.getCurrentInstance();
HttpServletRequest request = (HttpServletRequest) fc.getExternalContext().getRequest();

and then use the normal request methods to obtain path information. Alternatively,

context.getViewRoot().getViewId();
will return you the name of the current JSP (JSF view IDs are basically just JSP path names).

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Ques 14. How to access web.xml init parameters from java code?

You can get it using externalContext getInitParameter method. For example, if you have:

<context-param>
<param-name>connectionString</param-name>
<param-value>jdbc:oracle:thin:scott/tiger@cartman:1521:O901DB</param-value>
</context-param>
You can access this connection string with:

FacesContext fc = FacesContext.getCurrentInstance();
String connection = fc.getExternalContext().getInitParameter("connectionString");

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Ques 15. How to access web.xml init parameters from jsp page?

You can get it using initParam pre-defined JSF EL valiable.

For example, if you have:

<context-param>
<param-name>productId</param-name>
<param-value>2004Q4</param-value>
</context-param>
You can access this parameter with #{initParam['productId']} . For example:

Product Id: <h:outputText value="#{initParam['productId']}"/>

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Ques 16. How to terminate the session?

In order to terminate the session you can use session invalidate method.

This is an example how to terminate the session from the action method of a backing bean:

public String logout() {
FacesContext fc = FacesContext.getCurrentInstance();
HttpSession session = (HttpSession) fc.getExternalContext().getSession(false);
session.invalidate();
return "login_page";
}
The following code snippet allows to terminate the session from the jsp page:

<% session.invalidate(); %>

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Ques 17. How to reload the page after ValueChangeListener is invoked?

At the end of the ValueChangeListener, call FacesContext.getCurrentInstance().renderResponse()

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Ques 18. How to download PDF file with JSF?

This is an code example how it can be done with action listener of the backing bean.

Add the following method to the backing bean:


public void viewPdf(ActionEvent event) {
String filename = "filename.pdf";

// use your own method that reads file to the byte array
byte[] pdf = getTheContentOfTheFile(filename);

FacesContext faces = FacesContext.getCurrentInstance();
HttpServletResponse response = (HttpServletResponse) faces.getExternalContext().getResponse();

response.setContentType("application/pdf");
response.setContentLength(pdf.length);
response.setHeader( "Content-disposition", "inline; filename=""+fileName+""");
try {
ServletOutputStream out;
out = response.getOutputStream();
out.write(pdf);
} catch (IOException e) {
e.printStackTrace();
}
faces.responseComplete();
}
This is a jsp file snippet:

<h:commandButton immediate="true" actionListener="#{backingBean.viewPdf}" value="Read PDF" />

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Ques 19. How to show Confirmation Dialog when user Click the Command Link?

ah:commandLink assign the onclick attribute for internal use. So, you cannot use it to write your own code. This problem will fixed in the JSF 1.2. For the current JSF version you can use onmousedown event that occurs before onclick.
<script language="javascript">
function ConfirmDelete(link) {
var delete = confirm('Do you want to Delete?');
if (delete == true) {
link.onclick();
}
}
</script>

. . . . <h:commandLink action="delete" onmousedown="return ConfirmDelete(this);">
<h:outputText value="delete it"/> </h:commandLink>

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Ques 20. What is the different between getRequestParameterMap() and getRequestParameterValuesMap()

getRequestParameterValuesMap() similar to getRequestParameterMap(), but contains multiple values for for the parameters with the same name. It is important if you one of the components such as <h:selectMany>.

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Ques 21. Is it possible to have more than one Faces Configuration file?

Yes. You can define the list of the configuration files in the web.xml.

This is an example:

<context-param>
<param-name>javax.faces.CONFIG_FILES</param-name>
<param-value>/WEB-INF/faces-config-navigation.xml,/WEB-INF/faces-beans.xml</param-value>
</context-param>
Note: Do not register /WEB-INF/faces-config.xml file in the web.xml . Otherwise, the JSF implementation will process it twice.

Hi there, I guess the Note: column should have been meant or intended for "faces-config.xml" file as thats the default configuration file for JSF (which is similar to struts-config.xml for Struts!!). faces-context.xml file sounds like the user defined config file similar to the aforementioned two xml files.

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Ques 22. How to print out html markup with h:outputText?

The h:outputText has attribute escape that allows to escape the html markup. By default, it equals to "true". It means all the special symbols will be replaced with '&' codes. If you set it to "false", the text will be printed out without ecsaping.

For example, <h:outputText value="<b>This is a text</b>"/>

will be printed out like:

<b>This is a text</b>

In case of <h:outputText escape="false" value="<b>This is a text</b>"/>

you will get:

This is a text

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Ques 23. h:inputSecret field becomes empty when page is reloaded. How to fix this?

Set redisplay=true, it is false by default.

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Ques 24. Discuss life cycle in JSF.

The life cycle of a JavaServer Faces page is similar to that of a JSP page: The client makes an HTTP request for the page, and the server responds with the page translated to HTML. However, because of the extra features that JavaServer Faces technology offers, the life cycle provides some additional services to process a page.

JSF application lifecycle consist of six phases which are as follows

  • Restore view phase

  • Apply request values phase; process events

  • Process validations phase; process events

  • Update model values phase; process events

  • Invoke application phase; process events

  • Render response phase

Restore View Phase:

When a request for a JavaServer Faces page is made, such as when a link or a button is clicked, the JavaServer Faces implementation begins the restore view phase.

Apply Request Values Phase:

After the component tree is restored, each component in the tree extracts its new value from the request parameters by using its decode method. The value is then stored locally on the component. If the conversion of the value fails, an error message associated with the component is generated and queued on FacesContext. This message will be displayed during the render response phase, along with any validation errors resulting from the process validations phase.

Process Validations Phase:

During this phase, the JavaServer Faces implementation processes all validators registered on the components in the tree. It examines the component attributes that specify the rules for the validation and compares these rules to the local value stored for the component.

Update Model Values Phase:

After the JavaServer Faces implementation determines that the data is valid, it can walk the component tree and set the corresponding server-side object properties to the components' local values. The JavaServer Faces implementation will update only the bean properties pointed at by an input component's value attribute. If the local data cannot be converted to the types specified by the bean properties, the life cycle advances directly to the render response phase so that the page is rerendered with errors displayed. This is similar to what happens with validation errors.

Invoke Application Phase:

During this phase, the JavaServer Faces implementation handles any application-level events, such as submitting a form or linking to another page.

Render Response Phase:

During this phase, the JavaServer Faces implementation delegates authority for rendering the page to the JSP container if the application is using JSP pages. If this is an initial request, the components represented on the page will be added to the component tree as the JSP container executes the page. If this is not an initial request, the components are already added to the tree so they needn't be added again. In either case, the components will render themselves as the JSP container traverses the tags in the page.

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Language in C interview questions and answers - Total 80 questions
School Teachers interview questions and answers - Total 25 questions
Digital Marketing interview questions and answers - Total 40 questions
Statistics interview questions and answers - Total 30 questions
Apache Spark interview questions and answers - Total 24 questions
Full-Stack Developer interview questions and answers - Total 60 questions
VISA interview questions and answers - Total 30 questions
IIS interview questions and answers - Total 30 questions
System Design interview questions and answers - Total 30 questions
Cloud Computing interview questions and answers - Total 42 questions
Google Analytics interview questions and answers - Total 30 questions
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Hadoop interview questions and answers - Total 40 questions
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NodeJS interview questions and answers - Total 30 questions
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Next.js interview questions and answers - Total 30 questions
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