a half answer: I behaved the same in 3.0.6... imho it's the "unknown" variables that get instantiated differently... but I did not investigate much further... suggestion: ignore - make your own rules behave better :-) GernotWhen I test the Golfer example in Drools4.0 environment. I found the rule was matched twice but print same result. I try to override equals() and hashCode() method in Golfer Object, but no change happen. Who can tell me the reason that happened? Thanks. Jason Wang _______________________________________________ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users