I have a drl that only contains a declare statement. When I load a drl containing rules I also load that drl. But when the rule executes I get an error which is the same as if I didn't have the declare. When I debug and check the PackageDescr for the drl containing the 'declare' the TypeDeclarationDescr is in the package and seems to have the correct values. Both the rule and the drl with the 'declare' are in the same package: declartions.drl: ----------- package memelet.droolsesper import memelet.droolsesper.MarketDataEvent declare MarketDataEvent @role(event) @expires(10s) end ----------- rule.drl: ----------- package memelet.droolsesper import memelet.droolsesper.ArrivalRate global ArrivalRate arrivalRate rule "How do I measure the rate of arrival of events in a given time period?" /* select count(*) as cnt from MarketDataEvent.win:time_batch(1 second) */ /* 5.0.1 does not support 'time_batch', so the best we can do is capture the continous count. */ when $rate : Long() from accumulate ( $e: MarketDataEvent() over window:time(1s) from entry-point "stream", count($e)) then arrivalRate.value = $rate; end ----------- -- View this message in context: http://www.nabble.com/Share-%27declare%27-by-adding-drl-to-KnowledgeBuild... Sent from the drools - user mailing list archive at Nabble.com.