[rules-users] Help with LHS part of the Rule

I am using Drools 5. In the LHS part of a rule, is it possible to call a method, in a class instance (that has been inserted into the working memory) which expects two parameters, and returns a boolean? For example, how can I invoke the following method in LHS (in a DRL file) part of the rule? public class BusinessService { public boolean isValidSomething(String param1, String param2) { return true; } } The only way I could do this was: $bService : BusinessService() $retValue : Boolean() from $bService.isValidSomething("param1", "param2") The problem I am running into is, by using the above syntax, I am forced to use 'eval', when I have to use some conditional logic. My understanding is that using 'eval' will result in sub-optimal performance. Another question I have is related to conditional logic in the rule language. When I capture the return values (as shown above) in variables, I am not able to use the following syntax... $date1 : Date() from Object1.getBeginDate() $date2 : Date() from Object2.getCancelDate() (Object1 and Object2 are different object's) (($retValue == Boolean.FALSE) && ($date1 > $date2)) I have to do the following: eval (($retValue == Bollean.FALSE) && ($date1.getTime() > $date2.getTime())) I am not sure if I am using the rule language correctly. So, please bear with me, if I making some obvious mistakes. Any help, would be highly appreciated. Thanks! -- View this message in context: http://www.nabble.com/Help-with-LHS-part-of-the-Rule-tp24128872p24128872.... Sent from the drools - user mailing list archive at Nabble.com.