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

[Ansgar Konermann (JIRA)]

    [ https://issues.jboss.org/browse/JBRULES-3279?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12693284#comment-12693284 ] 

Ansgar Konermann commented on JBRULES-3279:
-------------------------------------------

We encountered the same "BUG: Can't build a rete network with an inner OR group element". Code looks similar:

{code}
rule "most_recent_commission_income"
  when
    $borrower : FBorrower()
    $totalAmount: FMoney() from accumulate (
      (and
        $employmentIncome : FEmploymentIncome(earnedBy == $borrower )
        FYearlyIncome($ownedBy: ownedBy == $employmentIncome,
          $type: type == FYearlyIncomeType.COMMISSION,
          $sustainable: sustainable == true,
          $year: year, $amount: amount
        )
        not (exists (FYearlyIncome(ownedBy == $ownedBy, type == $type , year.index < $year.index, sustainable == $sustainable)))
      ),
      sumMoney($amount)
    )
    then
      // ...
end
{code}


Any first insights what might cause this and how to work around it? 

We'd really love to upgrade from Drools 5.1.1 to 5.4.0.Final, but this bug is preventing us from dropping the old version. The bug does not occurr when using Drools 5.1.1.
                
> 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.

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