[JBoss JIRA] (DROOLS-4342) Using BigDecimal with From Accumulate causes an "Error: argument type mismatch"

Friday, 19 July 2019

    [
https://issues.jboss.org/browse/DROOLS-4342?page=com.atlassian.jira.plugi...
] 

Luca Molteni commented on DROOLS-4342:
--------------------------------------

It's indeed a type mismatch, as the accumulate over a BigDecimal will return a Double
and in the consequence you try to set it to a BigDecimal field.

Please change this rule like this:

rule "rule"
dialect "mvel"
when
  voucher : Voucher( )
  sumBilledAmounts : Number( ) from accumulate ( bill : Bill( billedAmount != null ),
    sum(bill.billedAmount))
then
  modify( voucher ) {
      setTotal( BigDecimal.valueOf(sumBilledAmounts.doubleValue()) )
  }
end

In this way you get the best data type for accumulating and at the same time you can
decide which type (and precision) to set in the actual field.

...
 Using BigDecimal with From Accumulate causes an "Error: argument
type mismatch"
 -------------------------------------------------------------------------------

                 Key: DROOLS-4342
                 URL: https://issues.jboss.org/browse/DROOLS-4342
             Project: Drools
          Issue Type: Bug
          Components: kie server
         Environment: Red Hat Process Automation Manager (RHPAM) 7.2.0
            Reporter: Rodrigo Ribeiro
            Assignee: Luca Molteni
            Priority: Major
              Labels: BigDecimal, DRL, bigdecimal, drl, kie-server, rhpam, rule
         Attachments: reproducer-02425606.zip, request.json, testSum.scenario

 When written a rule that does a sum using ‘from accumulate’. The rule validates
successfully. However, when trying to test it, is returned a very generic error message:
Error: argument type mismatch. 

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