[jboss-jira] [JBoss JIRA] (JBRULES-3643) Drools Planner score corruption during construction heuristics if there are rules that check if planning variable is null

[Reinis Vicups (JIRA)]

     [ https://issues.jboss.org/browse/JBRULES-3643?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Reinis Vicups updated JBRULES-3643:
-----------------------------------

    Workaround Description: No known workarounds, this issue causes unpredictable results.  (was: As a possible workaround remove rules that check if planning variable is null. But, since during construction heuristics rules are checked as well, consider explicitly checking that the planning variables are NOT null e.g. Foo(bar != null) or you will get NPEs.)

    
> Drools Planner score corruption during construction heuristics if there are rules that check if planning variable is null
> -------------------------------------------------------------------------------------------------------------------------
>
>                 Key: JBRULES-3643
>                 URL: https://issues.jboss.org/browse/JBRULES-3643
>             Project: Drools
>          Issue Type: Bug
>      Security Level: Public(Everyone can see) 
>          Components: drools-planner
>    Affects Versions: 5.4.0.Final
>         Environment: linux 32bit JavaSE 1.6
>            Reporter: Reinis Vicups
>            Assignee: Geoffrey De Smet
>            Priority: Minor
>
> A score corruption occurs in DEBUG environment Mode during construction heuristics if there are rules that add constraints if planning variable is null e.g.
> {code}
> rule "no foo without bar"
>     when
>         $foo : Foo(bar == null)
>     then
>         insertLogical( new IntConstraintOccurrence("foo without bar", ConstraintType.NEGATIVE_HARD, 1, $foo) );
> end
> {code}
> Debugging show following sympthoms: While org.drools.planner.core.constructionheuristic.greedyFit.decider.DefaultGreedyDecider executed doMove() a deviation between undoScore and lastCompletedStepScore occur (around the 108th line of code):
> {code}
> ...
>         if (assertUndoMoveIsUncorrupted) {
>             GreedyFitSolverPhaseScope greedyFitSolverPhaseScope = moveScope.getGreedyFitStepScope()
>                     .getGreedyFitSolverPhaseScope();
>             Score undoScore = greedyFitSolverPhaseScope.calculateScore();
>             Score lastCompletedStepScore = greedyFitSolverPhaseScope.getLastCompletedStepScope().getScore();
>             if (!undoScore.equals(lastCompletedStepScore)) { //<-- HERE scores deviate!
> ...
> {code}
> Again, this occurs only in DEBUG environment mode!

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