HARDSOFTBIGDECIMAL スコアの使用。
構成ファイルで、scoreAttained を 0hard/0soft に設定しました。
次のエラーが表示されます。
Exception in thread "main" java.lang.ArithmeticException: Non-terminating decimal expansion; no exact representable decimal result.
at java.math.BigDecimal.divide(Unknown Source)
at org.optaplanner.core.impl.score.buildin.hardsoftbigdecimal.HardSoftBigDecimalScoreDefinition.calculateTimeGradient(HardSoftBigDecimalScoreDefinition.java:96)
at org.optaplanner.core.impl.score.buildin.hardsoftbigdecimal.HardSoftBigDecimalScoreDefinition.calculateTimeGradient(HardSoftBigDecimalScoreDefinition.java:27)
at org.optaplanner.core.impl.termination.ScoreAttainedTermination.calculateSolverTimeGradient(ScoreAttainedTermination.java:50)
at org.optaplanner.core.impl.termination.OrCompositeTermination.calculateSolverTimeGradient(OrCompositeTermination.java:69)
at org.optaplanner.core.impl.termination.OrCompositeTermination.calculateSolverTimeGradient(OrCompositeTermination.java:69)
at org.optaplanner.core.impl.termination.PhaseToSolverTerminationBridge.calculatePhaseTimeGradient(PhaseToSolverTerminationBridge.java:80)
at org.optaplanner.core.impl.localsearch.DefaultLocalSearchSolverPhase.solve(DefaultLocalSearchSolverPhase.java:60)
at org.optaplanner.core.impl.solver.DefaultSolver.runSolverPhases(DefaultSolver.java:190)
at org.optaplanner.core.impl.solver.DefaultSolver.solve(DefaultSolver.java:155)
編集：
HARDSOFTBIGDECIMALSCOREDEFINITION を拡張し、 calculateTimeGradient(..) メソッドをオーバーライドすることで問題を解決しました。ここで、BigDecimal で除算メソッドが呼び出されると、切り上げられます。