Or may be something more basic : drools does not 'interpret' Integer types as int, so == is testing object references ... This explanation explain why it compiles but not working, whereas if my previous ideas are right, it should raise a compilation error ... Try using 'int', or use Integer.valueOf(1) (that will return a shared instance of Integer). But this is still very strange as doing the same test in java works (Integer is treated as a int, and == is testing values ...) ----- Mail original ----- De: "Vincent LEGENDRE" <vincent.legendre(a)eurodecision.com&gt; À: "Rules Users List" <rules-users(a)lists.jboss.org&gt; Envoyé: Jeudi 12 Avril 2012 20:44:41 Objet: Re: [rules-users] Trying to compare variables of two objects, not working. (compiles, but not desired result) I think (not sure) that the problem comes from the right part of your test : $lineItem.ID Try with $lineItem.getID(), or use 'dialect "mvel"' as rule property You can also bind the id in LineItem and test it in the next pattern : rule "Test" when $lineItem : LineItem( $lineID : ID > 0 ) $trans : TransactionItem( ID > 0, AccountName != null, LineItemID == $lineID) $amount : AccountingItem( TransactionID > 0, CalculatedCommission > 0.0 ) then System.out.println( $amount.getCalculatedCommission() + " " + $lineItem.getID() ); end But this is very strange. To me it should work ... What is not usual too is your use of "_" before member attributes (let me guess, you did a lot of C++ ?), which is not the java POJO standards. And may be that drools relies on fields names too ... And inside your tests, instead of "LineItemID" you should use "lineItemID" (with a lower case letter first, like the name your internal attribute should have, following the common java conventions). But if all of this is a problem, the symptom should be a compilation error .... so it is still strange ... _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users