[jboss-jira] [JBoss JIRA] (JBRULES-3279) Error message when using 2 patterns inside a single accumulate is not clear: Parser returned a null Package

Error message when using 2 patterns inside a single accumulate is not clear: Parser returned a null Package ----------------------------------------------------------------------------------------------------------- Key: JBRULES-3279 URL: https://issues.jboss.org/browse/JBRULES-3279 Project: Drools Issue Type: Bug Security Level: Public(Everyone can see) Affects Versions: 5.3.0.Final Reporter: Geoffrey De Smet Assignee: Edson Tirelli I am trying to parse this rule: {code} rule "machineUsage" when $machineCapacity : MrMachineCapacity($machine : machine, $resource : resource) $usageTotal : Number() from accumulate( MrProcessRequirement(resource == $resource, $process : process, $usage : usage) MrProcessAssignment(machine == $machine, process == $process), sum($usage) ) then ... end {code} And I get this error message: {code} Exception in thread "main" java.lang.IllegalStateException: There are errors in the scoreDrl's:[47,77]: [ERR 102] Line 47:77 mismatched input ',' in rule "machineUsage" [0,0]: Parser returned a null Package {code} For this line: {code} MrProcessAssignment(machine == $machine, process == $process), {code} It clear that it's because I can't use 2 patterns inside a single accumulate, but the error message seems wrong? When I try this instead: {code} rule "machineUsage" when $machineCapacity : MrMachineCapacity($machine : machine, $resource : resource) $usageTotal : Number() from accumulate( (MrProcessRequirement(resource == $resource, $process : process, $usage : usage) and MrProcessAssignment(machine == $machine, process == $process)), sum($usage) ) then ... end {code} I get: {code} Exception in thread "main" org.drools.RuntimeDroolsException: BUG: Can't build a rete network with an inner OR group element {code} Don't really see the OR in there.