Drools is not producing consistent results in the following example. If you run the DRL shown below, you will see that rules 2 and 3 activate and log a message. If you then comment out rule 3 in the DRL (you must put the entire rule inside /* */ characters rather than simply disabling it), and rerun it, you'll notice that rules 1 and 2 fire. How is it that the presence of rule 3 affects whether or not rule 1 activates? These two rules are not dependent in their DRL. It appears to be related to the fact that rule 1 uses single quotes instead of double quotes. If you change that, then Drools starts behaving consistently. This makes me believe that the problem is somehow related to how Drools is building the Rete tree with the single quotes. With all three rules active I get: [main]::INFO ::DroolsTest::test 3 hit on RecordA( id=100 ) - RecordB( id=100, role=2 ) [main]::INFO ::DroolsTest::test 2 hit on RecordA( id=100 ) - RecordB( id=100, role=1 ) With rule 3 commented out I get: [main]::INFO ::DroolsTest::test 2 hit on RecordA( id=100 ) - RecordB( id=100, role=1 ) [main]::INFO ::DroolsTest::test 1 hit on RecordA( id=100 ) - RecordB( id=100, role=1 ) Interestingly, if you comment out rule 2 so only rules 1 and 3 are active, rule 1 fires again: [main]::INFO ::DroolsTest::test 3 hit on RecordA( id=100 ) - RecordB( id=100, role=2 ) [main]::INFO ::DroolsTest::test 1 hit on RecordA( id=100 ) - RecordB( id=100, role=1 ) *Environment: Drools 5.4.0* package tests import org.apache.log4j.Logger; global Logger log declare RecordA id : long end declare RecordB id : long role : String end rule "insert data 1" salience 99999 when then insert (new RecordA(100)); insert (new RecordB(100, "1")); insert (new RecordB(100, "2")); end rule "test 1" when a : RecordA( ) b : RecordB( id == b.id, role == '1' ) then log.info(String.format("%s hit on %s - %s", kcontext.getRule().getName(), a, b)); end rule "test 2" when a : RecordA( ) b : RecordB( id == b.id, role == "1" ) then log.info(String.format("%s hit on %s - %s", kcontext.getRule().getName(), a, b)); end rule "test 3" when a : RecordA( ) b : RecordB( id == b.id, role == "2" ) then log.info(String.format("%s hit on %s - %s", kcontext.getRule().getName(), a, b)); end -- View this message in context: http://drools.46999.n3.nabble.com/Drools-Rule-Evaluations-are-Inconsisten... Sent from the Drools: User forum mailing list archive at Nabble.com. _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users