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

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!