Usnig Java Interfaces in ColdFusion

Below i my attempt to use the java interface java.util.Enumeration.  Because it is an interface and cannot be instantiated the code fails with the error:

Unable to find a constructor for class java.util.Enumeration that accepts parameters of type ( '' ).


How do I correct this.

If (IsDefined('URL.oid') and IsDefined('URL.crgid')) {
	if (Not IsDefined('Session.HtCreativeGroups')){
		ht = createObject('java','java.util.Hashtable').init();
		Session.HtCreativeGroups = ht;
	}
	Session.HtCreativeGroups.put(URL.oid, URL.crgid);
	keys = createObject('java','java.util.Enumeration').init();
	keys = Session.HtCreativeGroups.keys();
	while ( keys.hasMoreElements() )
 			{ 
 				key =  JavaCast("keys.nextElement()", String);
 				creativeGroup =  JavaCast("Session.HtCreativeGroups.get(key)", String);
 				writeOutput( key & " " & creativeGroups );
 				writeOutput("<BR>");
 			} 
	
}

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