Class adf.controller.faces.context.FacesPageLifecycleContext not found

Hi all,
I am using Jdeveloper 11.1.1.0 and I have a class uses FacesPageLifecycleContext.
When I import the class oracle.adf.controller.faces.context.FacesPageLifecycleContext, the debugger tells me it does not found that class.
How can I solve the problem?
Does I miss any library on my project?
Thanks
Andrea

Excuse me, but I don't understand. Have I to found all these files:
trinidad-api.jar
trinidad-impl.jar
adf-richclient-api-11.jar
adf-richclient-impl-11.jar
in my classpath?
I am looking for these files in C:\Oracle\Middleware\jdeveloper\adfv but in this folder I have only jlib and skin folder.
Can you give any other informations, please.
Thank you so much

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