[rules-users] How to initialze a query parameter or set an empty list

Hi all So I have this query: query listPrimaryBenefits(List primaries) RuleInsuranceSubtype($subtypeId := id, riderFlag != "Y") and primaries := List() from collect (InsuranceCover(benefitTypeId == $subtypeId, topup == Boolean.FALSE)) end outside the query and within my rule I have this checking: rule "Test rule" when listPrimaryBenefits($primaries;) eval($priamries == null || primaries.isEmpty()) then assert XXXX Now, if there is a RuleInsuranceSubtype in WM with given condition, everuthing is fine and $primaries is empty and being checked in eval statement BUT if there is no RuleInsuranceSubtype in WM with riderFlag as N (which is a valid scenario) then the whole query returns false and as the result in the rule, my eval statement won't even get executed and its 'when' returns false. How can I prevent this? I tried to put OR but don't know how to set $primaries to an empty or null value. Does anybody know how to do this or have a better solution? Thanks -- View this message in context: http://drools.46999.n3.nabble.com/How-to-initialze-a-query-parameter-or-s... Sent from the Drools: User forum mailing list archive at Nabble.com.