Help is needed in JSF development

Hi
i am trying to develop a simple JSF application,that work fine with sun application server9.when i use tomcat it starts throwing following exception...
java.lang.NoClassDefFoundError: javax/faces/context/ExternalContext
please can anybody tell me..cant i deploy and run JSF application in tomcat?
to use tomcat does nay extra setting i need to do..
regards
shruthi

My quick guess is that the sun application server (because it is J2EE) has the JSF api and impl jars included in the classpath.
Tomcat is not really J2EE server and as such does not have the JSF api and impl jars around. You can put them in the common lib path or just include them in your war

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