[rules-users] drl's and silent failures

** warning: This is a rant, but it just might save you some head scratching if you run into these issues ** I really hate writing rules. Not, well not rules, but rules in the DRL language. There are so many edge conditions that fail silently. Here just two from today: ... then retract(f1) // some comment retract(f2) end In the above retract(f2) will not be invoke. No message about any problems -- it just doesn't happen. Remove the comment and f2 is retracted. And, where 'ksession' is a global ... then update(ksession.getFactHandle(f1), new MyF1(10, 10)) end In this one the constructor used for MyF1 does not exists. No message, just silent failure. Change the rule to: ... then MyF1 fi_new = MyF1(10, 10) update(ksession.getFactHandle(f1), f1_new) end And now the error message about the missing constructor is produced. -- View this message in context: http://n3.nabble.com/drl-s-and-silent-failures-tp704973p704973.html Sent from the Drools - User mailing list archive at Nabble.com.