Also, I get these below errors, which seems to indicate that something is very wrong with rule parser. Like it cannot parse anything because of the expander? [25] Unable to expand: Strategy strategy = new Strategy(drools.getRule().getName(), 1, [26] Unable to expand: new StrategyLeg(LongShort.LONG, availableQuantity, equity)); [27] Unable to expand: insertLogical(strategy); [6] Unable to expand: equity : EquityInstrument()[8] Unable to expand: position : Position([9] Unable to expand: instrument == equity,[10] Unable to expand: longShort == LongShort.SHORT,[11] Unable to expand: quantity > 0)[13] Unable to expand: legsQuantity : Integer(intValue < position.quantity)[14] Unable to expand: from accumulate( StrategyLeg([15] Unable to expand: priority > 1,[16] Unable to expand: instrument == equity,[17] Unable to expand: longShort == LongShort.SHORT,[18] Unable to expand: legQuantity : quantity )[19] Unable to expand: legsQuantity(legQuantity) )[22] Unable to expand: int availableQuantity = position.getQuantity() - legsQuantity; [23] Unable to expand: Strategy strategy = new Strategy(drools.getRule().getName(), 1, [24] Unable to expand: new StrategyLeg(LongShort.SHORT, availableQuantity, equity)); [25] Unable to expand: insertLogical(strategy); -- View this message in context: http://www.nabble.com/DSL-debugging--tp18095970p18096038.html Sent from the drools - user mailing list archive at Nabble.com.