I also tried the following rule syntax with from but without collect ( ) : rule "Explode Globals" ruleflow-group "Data Prep" when $market : Market() from request.requestObjects.values $series : CandleSeries() from $market.candleSeries then insert ( $series ); insert ( $market ); end At runtime I get an exception: org.mvel.PropertyAccessException: unable to resolve property: values