JSF 1.2 migration to Facelets

My all application is written with jsf 1.2 I want to use from this moment on facelets where xhtml files are .

So I have some main questions:

1.I want to

• face one:upgrade to jsf 1.2 with servlets
• face two:from there to upgrade to 2.0

would this two changes break my application ?

2.how to do this ? can some one explain to me ? I have been trying all day long to do it i had :

• changed a file to xhtml amd changed his taglibs to xmlns such as : <%@ taglib prefix="a4j" uri="http://richfaces.org/a4j" %> will be converted to : xmlns:a4j="http://richfaces.org/a4j"

• adding

  <view-handler>
      com.sun.facelets.FaceletViewHandler
   </view-handler> 
  

  inside application in the faces config

• changing file name from xxx.jsp to xxx.xhtml

• adding <context-param> <param-name>javax.faces.DEFAULT_SUFFIX</param-name> <param-value>.xhtml</param-value> </context-param>

to web xml

• inserting

  f:view tag above all

the problem i am facing now

when *.jsf page is called the server says no page like this exists in the system... when *.xhtml is called the page itself is blank and the server asks me to download it meaning a pop up with open and save 开发者_StackOverflow社区options popes.