[rules-users] Optaplanner rules NullPointerException in PhreakAccumulateNode

[Geoffrey De Smet]

That's a bug in drools.
What version are you using?
If you can reproduce it in 6.0.0.Final, can you file a jira here?
   https://issues.jboss.org/browse/DROOLS

On 21-11-13 14:40, ns wrote:
> Hi,
>
> I am trying to accomplish the following, a part time employee (eg 50%) needs
> to do only half the shifts a full time employee needs to do. I have created
> a rule, that
>
> 1. count number of shifts of certain shiftType
> 2. count number of shifts of a certain shiftType per employee
> 3. count the total number of "arbeidsbreuken" per employee and within a
> certain shiftType
> 4. do something with these numbers so that an part time employee only gets
> half the shifts assigned that a full time employee gets
>
> The complete rule is:
>
> rule "arbeidsbreuk"
>      when
>      	//System.out.println("arbeidsbreuk, Drools!");
>      	ShiftAssignment($employee : employee, $shiftType : shiftType)
>      	//count aantal shifts
>          $assignmentTotal : Number() from accumulate(
>              $assignment : ShiftAssignment(shiftType == $shiftType),
>              count($assignment)
>          )
>          
>          //count aantal shifts per medewerker
>          $assignmentTotalEmployee : Number() from accumulate(
>              $assignmentEmployee : ShiftAssignment(employee == $employee,
> shiftType == $shiftType),
>              count($assignmentEmployee)
>          )
>          
>          //count arbeidsbreuken van alle medewerkers
>          $arbeidsbreukTotal : Number() from accumulate(
>              //Employee($breuk : arbeidsbreuk),
>              ShiftAssignment(employee == $employee, shiftType == $shiftType),
>              sum($employee.getArbeidsbreuk())
>          )
> $assignmentTotalEmployee.intValue())
>      then
>      	System.out.println("Arbeidsbreuk drools: " +
> $employee.getArbeidsbreuk() + " - " + $assignmentTotal.intValue() + " - " +
> $assignmentTotalEmployee.intValue() + " - " + $arbeidsbreukTotal);
>          scoreHolder.addSoftConstraintMatch(kcontext,
> -(Math.abs(($employee.getArbeidsbreuk() * $assignmentTotal.intValue()) -
> $assignmentTotalEmployee.intValue()) *
> (Math.abs(($employee.getArbeidsbreuk() * $assignmentTotal.intValue()) -
> $assignmentTotalEmployee.intValue()))) );
> end
>
> I get the following error:
>
> Exception in thread "main" org.drools.core.RuntimeDroolsException:
> java.lang.NullPointerException
> 	at org.drools.core.rule.Accumulate.accumulate(Accumulate.java:182)
> 	at
> org.drools.core.phreak.PhreakAccumulateNode.addMatch(PhreakAccumulateNode.java:756)
> 	at
> org.drools.core.phreak.PhreakAccumulateNode.doLeftInserts(PhreakAccumulateNode.java:164)
> 	at
> org.drools.core.phreak.PhreakAccumulateNode.doNode(PhreakAccumulateNode.java:81)
> 	at
> org.drools.core.phreak.RuleNetworkEvaluator.switchOnDoBetaNode(RuleNetworkEvaluator.java:524)
> 	at
> org.drools.core.phreak.RuleNetworkEvaluator.evalBetaNode(RuleNetworkEvaluator.java:494)
> 	at
> org.drools.core.phreak.RuleNetworkEvaluator.innerEval(RuleNetworkEvaluator.java:277)
> 	at
> org.drools.core.phreak.RuleNetworkEvaluator.outerEval(RuleNetworkEvaluator.java:161)
> 	at
> org.drools.core.phreak.RuleNetworkEvaluator.evaluateNetwork(RuleNetworkEvaluator.java:116)
> 	at
> org.drools.core.phreak.RuleExecutor.reEvaluateNetwork(RuleExecutor.java:205)
> 	at
> org.drools.core.phreak.RuleExecutor.evaluateNetworkAndFire(RuleExecutor.java:65)
> 	at
> org.drools.core.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:936)
> 	at
> org.drools.core.common.DefaultAgenda.fireAllRules(DefaultAgenda.java:1183)
> 	at
> org.drools.core.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:935)
> 	at
> org.drools.core.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:909)
> 	at
> org.drools.core.impl.StatefulKnowledgeSessionImpl.fireAllRules(StatefulKnowledgeSessionImpl.java:233)
> 	at
> org.optaplanner.core.impl.score.director.drools.DroolsScoreDirector.calculateScore(DroolsScoreDirector.java:98)
> 	at
> org.optaplanner.core.impl.solver.scope.DefaultSolverScope.calculateScore(DefaultSolverScope.java:101)
> 	at
> org.optaplanner.core.impl.bestsolution.BestSolutionRecaller.solvingStarted(BestSolutionRecaller.java:58)
> 	at
> org.optaplanner.core.impl.solver.DefaultSolver.solvingStarted(DefaultSolver.java:177)
> 	at
> org.optaplanner.core.impl.solver.DefaultSolver.solve(DefaultSolver.java:154)
> 	at be.ocmwturnhout.permanenties.Main.main(Main.java:495)
> Caused by: java.lang.NullPointerException
> 	at
> be.ocmwturnhout.permanenties.solver.Rule_arbeidsbreuk654888368.accumulateExpression2(Rule_arbeidsbreuk654888368.java:23)
> 	at
> be.ocmwturnhout.permanenties.solver.Rule_arbeidsbreuk654888368AccumulateExpression2Invoker.evaluate(Rule_arbeidsbreuk654888368AccumulateExpression2Invoker.java:25)
> 	at
> org.drools.core.base.accumulators.JavaAccumulatorFunctionExecutor.accumulate(JavaAccumulatorFunctionExecutor.java:107)
> 	at org.drools.core.rule.Accumulate.accumulate(Accumulate.java:173)
> 	... 21 more
>
> Any idea how I can solve this? Thanks.
>
> Kind regards,
>
> Nick
>
>
>
> --
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