passing an object to a cfc as an argument

I am trying to pass an object of java.util.RegularEnumSet into a CFC as an argument. This object contains several methods, but when I try to use any of these methods inside the CFC it is telling me there is no such methods in my enum set. When I use these java methods outside of my cfc on a test page it works just fine, any ideas why I cant pass this java object into my cfc and use the object's methods? Thanks in advance.