[rules-users] How to check if a property IS null ?

I'm trying to check if property is null, but the rule is never fired : Sample : rule "Cancel" when $action : CancelProductBookingDetail( created == null ) then end (created is of type java.util.Date) Any help is appreciated. Hendy -- View this message in context: http://drools.46999.n3.nabble.com/How-to-check-if-a-property-IS-null-tp40... Sent from the Drools: User forum mailing list archive at Nabble.com.