[jboss-jira] [JBoss JIRA] Updated: (JBRULES-1511) Can only reason over sub-objects if you use the From Conditional Element

Can only reason over sub-objects if you use the From Conditional Element ------------------------------------------------------------------------ Key: JBRULES-1511 URL: http://jira.jboss.com/jira/browse/JBRULES-1511 Project: JBoss Drools Issue Type: Bug Security Level: Public(Everyone can see) Components: Reteoo Affects Versions: 4.0.4, 4.0.5 Reporter: Aaron Dixon Assigned To: Edson Tirelli Attachments: drools-issue.zip It appears that you MUST use the From Condition Element to reason over sub-objects or else Drools yields unpredictable behavior. The first two rules below appear to be semantically equivalent. However the "bad" rule (the rule that does not use the from conditional element) does not get activated correctly when there is another rule (see the third rule) that modifies the age sub-property before the first two rules are activated: rule "Older than 20 - Good" salience -100 when person : Person( ) Details( age > 20 ) from person.details then System.out.println( "Older than 20 (good) : " + person ); end rule "Older than 20 - Bad" salience -100 when person : Person( details.age > 20 ) then System.out.println( "Older than 20 (bad) : " + person ); end rule "30 is the new 20" when person : Person( details.age == 30 ) then person.getDetails().setAge( 20 ); System.out.println( "Now 20 : " + person ); update( person ); end Given that the "bad" rule is semantically equivalent to the second rule, Drools should treat both rules the same in the engine. See the referenced forum thread for further justification for this claim. Also, see the attached zip for an executable example.