10:40 p.m.
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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