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

[Geoffrey De Smet (Created) (JIRA)]

Error message when using 2 patterns inside a single accumulate is not clear: Parser returned a null Package
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                 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.

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