Re: [rules-users] Rule does not fire after 'Modify/Update' of a fact - Drools 5.1.1 !

Hello all, For some reason I have a rule that does not fire after a Modify/Update. I have 2 facts - Product and Option. The relationship between them is that a 'Product' can have 0 - N 'Option'(s). Based on that, I added a 'product' field to the 'Option' object. I'm creating and inserting my facts using the following code : Product prod = new Product ("001","002", "A"); prod.setPrice(new BigDecimal("300.00")); Option opt = new Option ("H1","",prod); ksession.insert(prod); ksession.insert(opt); Now in my .DLR, I have the following rule : rule "Set Options price" salience 50 when $prod : Product ( price != null ) $option : Option ( product == $prod ) then System.out.println( "Getting Options " + $prod ); end This gives me the correct output in the console : Getting Options Product [category=001, grade=A, price=300.00, style=002] The rule fired successfully. I start running into problems when I try to update the 'price' field using a rule, instead of through code. So for example, if I have the following rule also defined in the same drl file : rule "Set price" salience 500 when $prod : Product ( category == "001", price == null ) then $prod.setPrice ( new BigDecimal ( "300.00" ) ); update( $prod ); System.out.println( $prod ); end And then change my code as follows (remove the setPrice call) : Product prod = new Product ("001","002", "A"); Option opt = new Option ("H1","",prod); ksession.insert(prod); ksession.insert(opt); I only get the following output : Product [category=001, grade=A, price=300.00, style=002] What am I missing here ? I thought the rule 'Set Price' should update the product fact with the new price and the rules would get re-evaluated. After the re-evaluation, the LHS of 'Set Options Price' should now be true and it should have fired. But it does not. Am I mis-understanding something about activation here ? If I am, can someone please help explain what the gap is and how to re-write the rules so that I can achieve the above objective ? Any help will be appreciated. I've spend several hours trying different permutations and combinations and got no where. Thanks Gurvinder -- View this message in context: http://drools-java-rules-engine.46999.n3.nabble.com/Rule-does-not-fire-af... Sent from the Drools - User mailing list archive at Nabble.com. _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users