Hello world in JSF 2.0

XHTML is clean format html which follows strict rules for styles of tags .
Use of expression language in EL eases to keep code neat and clean .
JSF libraries support used of EL with xhtml .

In JSF 2.0 , it’s recommended to create JSF page in XHTML file format.
I am giving example of a web.xml with JSF and rich faces (Jboss components )

web.xml

 <?xml version="1.0" encoding="UTF-8"?> 
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"  
     xmlns="http://java.sun.com/xml/ns/javaee"  
     xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"  
     xsi:schemaLocation="http://java.sun.com/xml/ns/javaee  
     http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"  
     id="WebApp_ID" version="2.5"> 
 <display-name>JavaServerFaces</display-name> 
 <!-- Change to "Production" when you are ready to deploy --> 
 <context-param> 
  <param-name>javax.faces.PROJECT_STAGE</param-name> 
  <param-value>Development</param-value> 
 </context-param> 
 <!-- Welcome page --> 
 <welcome-file-list> 
  <welcome-file>faces/hello.xhtml</welcome-file> 
 </welcome-file-list> 
 <!-- JSF mapping --> 
 <servlet> 
  <servlet-name>Faces Servlet</servlet-name> 
  <servlet-class>javax.faces.webapp.FacesServlet</servlet-class> 
  <load-on-startup>1</load-on-startup> 
 </servlet> 
 <!-- Map these files with JSF --> 
 <servlet-mapping> 
  <servlet-name>Faces Servlet</servlet-name> 
  <url-pattern>/faces/*</url-pattern> 
 </servlet-mapping> 
 <servlet-mapping> 
  <servlet-name>Faces Servlet</servlet-name> 
  <url-pattern>*.jsf</url-pattern> 
 </servlet-mapping> 
 <servlet-mapping> 
  <servlet-name>Faces Servlet</servlet-name> 
  <url-pattern>*.faces</url-pattern> 
 </servlet-mapping> 
 <servlet-mapping> 
  <servlet-name>Faces Servlet</servlet-name> 
  <url-pattern>*.xhtml</url-pattern> 
 </servlet-mapping> 
</web-app> 

Navigation of pages need to be configured in a xml called faces-config.xml.
In JSF 2.0 you can manage bean in code using annotation
Still to control page flow this xml should be used .

example

 <?xml version='1.0' encoding='UTF-8'?>
<faces-config xmlns="http://java.sun.com/xml/ns/javaee" version="1.2" xsi="http://www.w3.org/2001/XMLSchema-instance" schemalocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-facesconfig_1_2.xsd" xi="http://www.w3.org/2001/XInclude">
<application>
<view-handler>com.sun.facelets.FaceletViewHandler</view-handler>
</application>
---
managed beans
--
navigation rules
---
</faces-config>