PrimeFaces + AJax

Pessoal alguem sabe pq nao esta chamando meu método javascript?

<p:inputMask mask="99.999.999/9999-99" onchange="consultaCNPJ();"> </p:inputMask>

Import:

<h:head> <script language="JavaScript" type="text/javascript" src="#{facesContext.externalContext.requestContextPath}/js/rfe.js"> </script> </h:head>