[jboss-jira] [JBoss JIRA] (DROOLS-345) NotSerializableException when attempting to serialize kcontext.getMatch().getObjects()

[Davide Sottara (JIRA)]

    [ https://issues.jboss.org/browse/DROOLS-345?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12931347#comment-12931347 ] 

Davide Sottara commented on DROOLS-345:
---------------------------------------

Looking at the collectSet accumulate function code:
{code}
    public Object getResult(Serializable context) throws Exception {
        CollectListData data = (CollectListData) context;
        return Collections.unmodifiableSet( data.map.keySet() );
    }
{code}
Indeed, it returns a HashMap's keySet
                
> NotSerializableException when attempting to serialize kcontext.getMatch().getObjects()
> --------------------------------------------------------------------------------------
>
>                 Key: DROOLS-345
>                 URL: https://issues.jboss.org/browse/DROOLS-345
>             Project: Drools
>          Issue Type: Bug
>      Security Level: Public(Everyone can see) 
>    Affects Versions:  6.0.0.CR4
>         Environment: Windows, Oracle Java JDK 1.7.0_21
>            Reporter: Reinis Vicups
>            Assignee: Mark Proctor
>
> Optaplanner is using kcontext.getMatch().getObjects() to retrieve objects participating in the match.
> This rule
> {code}
> rule "failing rule"
>     when
>         $project : Project
>         $resourceParallelism : Set from accumulate( Assignment(project == $project, resource != null, $resource : resource),
>             collectSet($resource) )
>     then
>         scoreHolder.addHardConstraintMatch(kcontext, -Math.abs($resourceParallelism.size() - $project.getOptimalResourceParallelism()));
> end
> {code}
> cause kcontext.getMatch().getObjects() later on to return List with two elements:
> 1. element is instance of Project (serializable)
> 2. element is instance of HashMap$KeySet of Resource (serializable)
> Issue is - HashMap$KeySet is not serializable thus causing the said Exception.
> I checked up with Mr. Proctor and Mr. De Smet. The final assumption was that accumulate could somehow cause HashMap$KeySet to be returned.
> Would be great if someone with understanding could check out how the objects get into kcontext.getMatch().getObjects() from the above rule and if it is drools wrapping my objects in HashMap$KeySet

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