Example from Optaplanner documentation on cartesianProductMoveSelector throws an exception: - optaplanner

Question

What is the proper way to do the cartesian move of two changeMoveSelectors for two planning variables?
I took the cartesianProductMoveSelector example From the documentation for Optaplanner version 8.25. The following configuration:
<?xml version="1.0" encoding="UTF-8"?>
<solver>
<solutionClass>com.company.MySolution</solutionClass>
<entityClass>com.company.Standstill</entityClass>
<entityClass>com.company.PlanningVisit</entityClass>
<environmentMode>REPRODUCIBLE</environmentMode>
<randomSeed>50</randomSeed>
<environmentMode>FULL_ASSERT</environmentMode>
<scoreDirectorFactory>
<constraintProviderClass>com.company.MyConstraintProvider
</constraintProviderClass>
<initializingScoreTrend>ONLY_DOWN</initializingScoreTrend>
</scoreDirectorFactory>
<termination>
<minutesSpentLimit>1800</minutesSpentLimit>
</termination>
<customPhase>
<customPhaseCommandClass>com.company.phase.MySolutionInit</customPhaseCommandClass>
</customPhase>
<constructionHeuristic>
<changeMoveSelector>
</changeMoveSelector>
<constructionHeuristicType>FIRST_FIT_DECREASING</constructionHeuristicType>
</constructionHeuristic>
<localSearch>
<termination>
<minutesSpentLimit>300</minutesSpentLimit>
</termination>
<unionMoveSelector>
<moveListFactory>
<variableName>previousStandstill</variableName>
<moveListFactoryClass>com.company.moves.RideChangeMoveFactory</moveListFactoryClass>
</moveListFactory>
<cartesianProductMoveSelector>
<changeMoveSelector>
<entitySelector id="cartesianProductEntitySelector"/>
<valueSelector>
<variableName>previousStandstill</variableName>
</valueSelector>
</changeMoveSelector>
<changeMoveSelector>
<entitySelector mimicSelectorRef="cartesianProductEntitySelector"/>
<valueSelector>
<variableName>startModifier</variableName>
</valueSelector>
</changeMoveSelector>
</cartesianProductMoveSelector>
<swapMoveSelector>
<variableName>previousStandstill</variableName>
</swapMoveSelector>
<subChainChangeMoveSelector>
<subChainSelector>
<valueSelector variableName="previousStandstill">
</valueSelector>
</subChainSelector>
<valueSelector variableName="previousStandstill">
</valueSelector>
<selectReversingMoveToo>true</selectReversingMoveToo>
</subChainChangeMoveSelector>
<subChainSwapMoveSelector>
<subChainSelector>
<valueSelector variableName="previousStandstill">
</valueSelector>
</subChainSelector>
<secondarySubChainSelector>
<valueSelector variableName="previousStandstill">
</valueSelector>
</secondarySubChainSelector>
<selectReversingMoveToo>true</selectReversingMoveToo>
</subChainSwapMoveSelector>
<tailChainSwapMoveSelector>
<valueSelector variableName="previousStandstill">
</valueSelector>
</tailChainSwapMoveSelector>
</unionMoveSelector>
<acceptor>
<entityTabuSize>12</entityTabuSize>
</acceptor>
<forager>
<acceptedCountLimit>3000</acceptedCountLimit>
</forager>
</localSearch>
</solver>
Throws an
Multiple EntityMimicRecorders (usually EntitySelectors) have the same id (cartesianProductEntitySelector).

Answer 1

I believe the problem was in the build process, so the source XML configuration and the XML that was actually used were not the same. I can confirm that this configuration works:
<?xml version="1.0" encoding="UTF-8"?>
<solver>
<solutionClass>com.company.MySolution</solutionClass>
<entityClass>com.company.Standstill</entityClass>
<entityClass>com.company.PlanningVisit</entityClass>
<environmentMode>REPRODUCIBLE</environmentMode>
<randomSeed>50</randomSeed>
<environmentMode>FULL_ASSERT</environmentMode>
<scoreDirectorFactory>
<constraintProviderClass>com.company.MyConstraintProvider
</constraintProviderClass>
<initializingScoreTrend>ONLY_DOWN</initializingScoreTrend>
</scoreDirectorFactory>
<termination>
<minutesSpentLimit>1800</minutesSpentLimit>
</termination>
<customPhase>
<customPhaseCommandClass>com.company.phase.MySolutionInit</customPhaseCommandClass>
</customPhase>
<constructionHeuristic>
<changeMoveSelector>
</changeMoveSelector>
<constructionHeuristicType>FIRST_FIT_DECREASING</constructionHeuristicType>
</constructionHeuristic>
<localSearch>
<termination>
<minutesSpentLimit>300</minutesSpentLimit>
</termination>
<cartesianProductMoveSelector>
<changeMoveSelector>
<entitySelector id="entitySelector"/>
<valueSelector variableName="previousStandstill"/>
</changeMoveSelector>
<changeMoveSelector>
<entitySelector mimicSelectorRef="entitySelector"/>
<valueSelector variableName="startModifier">
</valueSelector>
</changeMoveSelector>
</cartesianProductMoveSelector>
<acceptor>
<entityTabuSize>12</entityTabuSize>
</acceptor>
<forager>
<acceptedCountLimit>3000</acceptedCountLimit>
</forager>
</localSearch>
</solver>
I will edit this answer, once I add back the rest of the configs and will know exactly what was wrong.