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Unknown Tag(a4j:form and rich:panel)  RSS feed

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Hi Friends,
I am new to jsf, while doing sample program using eclispe and tomcat server facing issues
1. In the eclispe getting warning UnknowTag(A4j:from and rich:panel)
2. if i run the application command button is not displaying
Please see the below code and let me know whats the wrong i did.

<ui:composition xmlns="http://www.w3.org/1999/xhtml"
<%@ taglib uri="http://java.sun.com/jsf/core" prefix="f" %>
<%@ taglib uri="http://java.sun.com/jsf/html" prefix="h" %>

<!-- RichFaces tag library declaration -->

<title>RichFaces Greeter</title>
<rich:panel header="RichFaces Greeter" style="width: 315px">
<hutputText value="Your name: " />
<h:inputText value="#{user.name}" >
<f:validateLength minimum="1" maximum="4" />

<a4j:commandButton value="Get greeting" reRender="greeting" />
<h:panelGroup id="greeting" >
<hutputText value="Hello, " rendered="#{not empty user.name}" />
<hutputText value="#{user.name}" />
<hutputText value="!" rendered="#{not empty user.name}" />

Don't get me started about those stupid light bulbs.
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