Hi, I am having trouble dealing with doubles in the Optaplanner drools rule drl file. See error message below. Exception in thread "main" java.lang.IllegalStateException: There are errors in the scoreDrl's: Error Messages: Message [id=1, level=ERROR, path=optaplanner-kie-namespace//be/ocmwturnhout/permanenties/solver/permanentiesScoreRules.drl, line=96, column=0 text=Rule Compilation error The method addSoftConstraintMatch(RuleContext, int) in the type HardSoftScoreHolder is not applicable for the arguments (RuleContext, double)] I have the following then rule part: scoreHolder.addSoftConstraintMatch(kcontext, -(10 * Math.abs(($employee.getArbeidsbreuk() * $assignmentTotal.intValue()) - $assignmentTotalEmployee.intValue())) * (10 * Math.abs(($employee.getArbeidsbreuk().intValue() * $assignmentTotal.intValue()) - $assignmentTotalEmployee.intValue())) ); $employee.getArbeidsbreuk() is a double. Aren't doubles allowed or can I convert it? Thanks. Kind regards, Ncik -- View this message in context: http://drools.46999.n3.nabble.com/How-to-deal-with-doubles-in-Optaplanner... 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