OptaPlanner Nurse Rostering累積合計Nullポインタ例外

Question

OptaPlanner看護師の例を変更しようとしています。 これまでのところ、従業員が1日あたり13時間以上働いたときに反応するdrlファイルにルールを書きたいと思います。 shiftTypeクラスをShiftを1時間にするように拡張しました。

最初の見方では、ルールは機能しているようですが、しばらくしてから実行可能な解決策がないときは、NullPointerExceptionが発生します。

rule "dailyRestPeriod" 
when 


ShiftAssignment($employee : employee, $shiftType : shiftType, $shiftDate : shiftDate, $employee!=null) 
$dailyTotalHours : Number(intValue > 13) from accumulate(
       $assignmentEmployee: ShiftAssignment(employee == $employee, shiftDate == $shiftDate), 
      sum($assignmentEmployee.getShiftType().getShiftDurationHours()) 
     ) 
then 

System.out.println("Employee " +$employee +" dailyTotal " +$dailyTotalHours); 
scoreHolder.addHardConstraintMatch(kcontext, - 1); 
end 

と例外

Exception in thread "AWT-EventQueue-0" java.lang.IllegalStateException: Solving failed. 
    at org.optaplanner.examples.common.swingui.SolverAndPersistenceFrame$SolveWorker.done(SolverAndPersistenceFrame.java:319) 
    at javax.swing.SwingWorker$5.run(Unknown Source) 
    at javax.swing.SwingWorker$DoSubmitAccumulativeRunnable.run(Unknown Source) 
    at sun.swing.AccumulativeRunnable.run(Unknown Source) 
    at javax.swing.SwingWorker$DoSubmitAccumulativeRunnable.actionPerformed(Unknown Source) 
    at javax.swing.Timer.fireActionPerformed(Unknown Source) 
    at javax.swing.Timer$DoPostEvent.run(Unknown Source) 
    at java.awt.event.InvocationEvent.dispatch(Unknown Source) 
    at java.awt.EventQueue.dispatchEventImpl(Unknown Source) 
    at java.awt.EventQueue.access$500(Unknown Source) 
    at java.awt.EventQueue$3.run(Unknown Source) 
    at java.awt.EventQueue$3.run(Unknown Source) 
    at java.security.AccessController.doPrivileged(Native Method) 
    at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source) 
    at java.awt.EventQueue.dispatchEvent(Unknown Source) 
    at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source) 
    at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source) 
    at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source) 
    at java.awt.EventDispatchThread.pumpEvents(Unknown Source) 
    at java.awt.EventDispatchThread.pumpEvents(Unknown Source) 
    at java.awt.EventDispatchThread.run(Unknown Source) 
Caused by: java.lang.RuntimeException: java.lang.NullPointerException 
    at org.drools.core.rule.SingleAccumulate.reverse(SingleAccumulate.java:124) 
    at org.drools.core.phreak.PhreakAccumulateNode.removeMatch(PhreakAccumulateNode.java:806) 
    at org.drools.core.phreak.PhreakAccumulateNode.removePreviousMatchesForRightTuple(PhreakAccumulateNode.java:865) 
    at org.drools.core.phreak.PhreakAccumulateNode.doRightUpdates(PhreakAccumulateNode.java:444) 
    at org.drools.core.phreak.PhreakAccumulateNode.doNode(PhreakAccumulateNode.java:87) 
    at org.drools.core.phreak.RuleNetworkEvaluator.switchOnDoBetaNode(RuleNetworkEvaluator.java:534) 
    at org.drools.core.phreak.RuleNetworkEvaluator.evalBetaNode(RuleNetworkEvaluator.java:505) 
    at org.drools.core.phreak.RuleNetworkEvaluator.evalNode(RuleNetworkEvaluator.java:341) 
    at org.drools.core.phreak.RuleNetworkEvaluator.innerEval(RuleNetworkEvaluator.java:301) 
    at org.drools.core.phreak.RuleNetworkEvaluator.outerEval(RuleNetworkEvaluator.java:136) 
    at org.drools.core.phreak.RuleNetworkEvaluator.evaluateNetwork(RuleNetworkEvaluator.java:94) 
    at org.drools.core.phreak.RuleExecutor.reEvaluateNetwork(RuleExecutor.java:194) 
    at org.drools.core.phreak.RuleExecutor.evaluateNetworkAndFire(RuleExecutor.java:73) 
    at org.drools.core.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:970) 
    at org.drools.core.common.DefaultAgenda.fireLoop(DefaultAgenda.java:1312) 
    at org.drools.core.common.DefaultAgenda.fireAllRules(DefaultAgenda.java:1251) 

Answer 1

の一部私はなぜ理解していないが、私はルールを少し変更したときに、私が壊れたとき、それが正常に動作します：ここで

は、いくつかの関連するコードですルールをダウンさせる。 おそらく、それは計画変数と計画エンティティと関係がありますが、わかりません。 ここにコードはどのようになっていますか：

rule "dailyRestPeriod" 
when 
$employee : Employee() 
$shift : Shift($shiftType : shiftType , $shiftDate :shiftDate) 
$dailyTotalHours : Number(intValue >= 13) from accumulate(
       $assignmentEmployee: ShiftAssignment(employee == $employee, shiftDate == $shiftDate), 
      sum($assignmentEmployee.getShiftType().getShiftDurationHours()) 
     ) 
then 
scoreHolder.addHardConstraintMatch(kcontext, - 1); 
end