Primefaces adding Button issue - Beginner

I am trying to add a button using primefaces to a JFS page, and upon clicking it a method from a Java class should be called:

<p:commandButton type="submit" 
                 value="Test - Print Message" 
                 action="#{DataForm.Preference}" />

I get the primefaces button (the nice GUI), but when I click on the button the code开发者_运维知识库 from the java class DataForm.Preference is not executed.

I have used the attribute action in my code, and I don't think primefaces recognizes it, how should I call the method Preference from my DataForm class?

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I don't think "preference" is your method Name. Seems like its a property. Why is your value static? What's the point of then using an action method?