[OmniFaces utilities] The
getRequestCookie()method returns the value of the HTTP request cookie associated with the given name. The value is implicitly URL-decoded with a charset of UTF-8.
You can use this method to collect the value of any cookie, but for a quick test you can try to obtain the user session ID, which is stored by JSF (by default) under a cookie named, JSESSIONID:
// e.g. FzfUURPXjp6L_Sx6nhsqf3Zg.leonard-pc
String sessionId = Faces.getRequestCookie("JSESSIONID");