OptaPlanner throwing IllegalStateException on CompositeMove created by CartesianProductMoveSelector

Question

so basically my problem is, that OptaPlanner is throwing this:

java.lang.IllegalStateException: The entity (...) has a variable (previousEntry) with value (.         


        

Answer 1

I have the same problem and managed to avoid the issue with a MoveFilter that prevents the situation Frank explains in his answer (one move affecting another in a compositMove). Here is my badly coded proof of concept for the workaround:

public class ParallelTaskMoveFilter
            implements SelectionFilter> {

        @Override
        public boolean accept(ScoreDirector scoreDirector,
                CompositeMove selection) {
            Move[] childMoves = selection.getMoves();
            ChangeMove firstMove = (ChangeMove) childMoves[0];
            ChangeMove secondMove = (ChangeMove) childMoves[1];

            DailyRoute srcRoute1 = ((RouteItem) firstMove.getEntity()).getDailyRoute();
            DailyRoute destRoute1 = ((RouteItem) firstMove.getToPlanningValue()).getDailyRoute();
            DailyRoute srcRoute2 = ((RouteItem) secondMove.getEntity()).getDailyRoute();
            DailyRoute destRoute2 = ((RouteItem) secondMove.getToPlanningValue()).getDailyRoute();

            return !srcRoute1.equals(srcRoute2) && !srcRoute1.equals(destRoute2) && !destRoute2.equals(destRoute1)
                    && !srcRoute2.equals(destRoute1);
        }

    }