i have one drl like below: rule "FirstNameDifference" no-loop true lock-on-active true when person1: Person( $firstName1: firstName ) person2: Person( firstName != $firstName1 ) then dataDifferenceVO.getDataDiffArray().add("Person/FirstName"); end i'm passing a list of objects in which i have 2 person type objects. my aim is to check if the firstnames are same or different. if its different i need to add one String to the DataDiffArray that is declared inside DataDifferenceVO class. but as i pass 2 person objects in the WM the rule is getting executed twice. i.e, the string "Person/FirstName" is getting added twice in the array list. why is this happening?... the rule should compare 2 firstnames and return one String...is not that?... what step should i take to achive what i want.... Thanks a lot i advance... :) :) :) -- View this message in context: http://drools.46999.n3.nabble.com/drl-execution-problem-tp3866929p3866929... Sent from the Drools: User forum mailing list archive at Nabble.com. _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users

i have one drl like below: rule "FirstNameDifference" no-loop true lock-on-active true when person1: Person( $firstName1: firstName ) person2: Person( firstName != $firstName1 ) then dataDifferenceVO.getDataDiffArray().add("Person/FirstName"); end i'm passing a list of objects in which i have 2 person type objects. my aim is to check if the firstnames are same or different. if its different i need to add one String to the DataDiffArray that is declared inside DataDifferenceVO class. but as i pass 2 person objects in the WM the rule is getting executed twice. i.e, the string "Person/FirstName" is getting added twice in the array list. why is this happening?... the rule should compare 2 firstnames and return one String...is not that?... what step should i take to achive what i want.... Thanks a lot i advance... :) :) :) -- View this message in context: http://drools.46999.n3.nabble.com/drl-execution-problem-tp3866929p3866929... Sent from the Drools: User forum mailing list archive at Nabble.com. _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users

Hi laune Thanks for the solution. but i am confused a bit with point (b). how to add a constraint asserting an ordering between Persons in drl. sorry it may seem silly Qs but i'm new to drools and really want to know that. Can u explain in detail. Thanks again for the solution. -- View this message in context: http://drools.46999.n3.nabble.com/drl-execution-problem-tp3866929p3867432... Sent from the Drools: User forum mailing list archive at Nabble.com. _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users