[jboss-jira] [JBoss JIRA] (DROOLS-645) Accumulate returned fact causing NPE

[Mario Fusco (JIRA)]

    [ https://issues.jboss.org/browse/DROOLS-645?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13019923#comment-13019923 ] 

Mario Fusco commented on DROOLS-645:
------------------------------------

Yes sorry, that's normal. The rule's consequence changes the campaignName of the currently bound StatusMessage, so after 3 firings the list is empty and it thorws the exception. Of course the test is wrong, but I wrote it that way only to prove that the modify was working as expected.

> Accumulate returned fact causing NPE
> ------------------------------------
>
>                 Key: DROOLS-645
>                 URL: https://issues.jboss.org/browse/DROOLS-645
>             Project: Drools
>          Issue Type: Bug
>    Affects Versions: 6.2.0.Beta2
>         Environment: Mac OSX (maverick)
>            Reporter: Roger Lefebvre
>            Assignee: Mario Fusco
>         Attachments: RetryOldestCallTimeAccumulateFunction.java, RetryOldestCallTimeAccumulateFunction.java
>
>
> The issue is discussed in https://groups.google.com/forum/?hl=en-GB#!topic/drools-usage/aZU5mXSgHMI.
> Here is the gist of it....
> I changed the accumulator to the following and it worked:
> accumulate($sm:StatusMessage(campaignName==$campaign.campaignName, status==ManagerCallState.CALLER_FAILURE, attempts<3, sent==true), $message:oldestRetry( $sm ))  
> The previous approach was this:
> $message:StatusMessage() from accumulate($sm:StatusMessage(campaignName==$campaign.campaignName, status==ManagerCallState.CALLER_FAILURE, attempts<3, sent==true), oldestRetry( $sm ))
> which I thought was the correct or acceptable syntax option. Is there something I have overlooked in the second one ("from"??). It does give me a StatusMessage object but it lacks the underlying properties to allow the subsequent modify to work.



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