2:51 p.m.
I am currently using final 6.0 and I used
<constructionHeuristicType>BEST_FIT</constructionHeuristicType> but after I
have run it propmts java.lang.NullPointerException pointing to my
PlanningVariableStrengComparator. Did I miss something? My planning variable
comparator by the way is :
public class MyVariableStrengthComparator implements Comparator<MyVariable>,
Serializable {
public int compare(MyVariable a, MyVariable b) {
return new CompareToBuilder()
.append(a.getId(), b.getId())
.toComparison();
}
}
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1:46 a.m.
Can you copy-paste the whole stacktrace?
On 25-11-13 21:51, newbie wrote:
I am currently using final 6.0 and I used
<constructionHeuristicType>BEST_FIT</constructionHeuristicType> but after I
have run it propmts java.lang.NullPointerException pointing to my
PlanningVariableStrengComparator. Did I miss something? My planning variable
comparator by the way is :
public class MyVariableStrengthComparator implements Comparator<MyVariable>,
Serializable {
public int compare(MyVariable a, MyVariable b) {
return new CompareToBuilder()
.append(a.getId(), b.getId())
.toComparison();
}
}
--
View this message in context:
http://drools.46999.n3.nabble.com/BEST-FIT-Null-Pointer-Exception-tp40269...
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6:32 a.m.
Exception in thread "main" java.lang.NullPointerException
at
com.example.domain.solver.MyVariableStrengthComparator.compare(MyVariableStrengthComparator.java:30)
at
com.example.domain.solver.MyVariableStrengthComparator.compare(MyVariableStrengthComparator.java:1)
at java.util.Arrays.mergeSort(Arrays.java:1270)
at java.util.Arrays.mergeSort(Arrays.java:1282)
at java.util.Arrays.mergeSort(Arrays.java:1282)
at java.util.Arrays.mergeSort(Arrays.java:1282)
at java.util.Arrays.mergeSort(Arrays.java:1282)
at java.util.Arrays.sort(Arrays.java:1210)
at java.util.Collections.sort(Collections.java:159)
at
org.optaplanner.core.impl.heuristic.selector.common.decorator.ComparatorSelectionSorter.sort(ComparatorSelectionSorter.java:28)
at
org.optaplanner.core.impl.heuristic.selector.value.decorator.SortingValueSelector.constructCache(SortingValueSelector.java:43)
at
org.optaplanner.core.impl.heuristic.selector.common.SelectionCacheLifecycleBridge.phaseStarted(SelectionCacheLifecycleBridge.java:48)
at
org.optaplanner.core.impl.phase.event.SolverPhaseLifecycleSupport.firePhaseStarted(SolverPhaseLifecycleSupport.java:41)
at
org.optaplanner.core.impl.heuristic.selector.AbstractSelector.phaseStarted(AbstractSelector.java:47)
at
org.optaplanner.core.impl.phase.event.SolverPhaseLifecycleSupport.firePhaseStarted(SolverPhaseLifecycleSupport.java:41)
at
org.optaplanner.core.impl.heuristic.selector.AbstractSelector.phaseStarted(AbstractSelector.java:47)
at
org.optaplanner.core.impl.heuristic.selector.value.decorator.ReinitializeVariableValueSelector.phaseStarted(ReinitializeVariableValueSelector.java:52)
at
org.optaplanner.core.impl.phase.event.SolverPhaseLifecycleSupport.firePhaseStarted(SolverPhaseLifecycleSupport.java:41)
at
org.optaplanner.core.impl.heuristic.selector.AbstractSelector.phaseStarted(AbstractSelector.java:47)
at
org.optaplanner.core.impl.phase.event.SolverPhaseLifecycleSupport.firePhaseStarted(SolverPhaseLifecycleSupport.java:41)
at
org.optaplanner.core.impl.heuristic.selector.AbstractSelector.phaseStarted(AbstractSelector.java:47)
at
org.optaplanner.core.impl.phase.event.SolverPhaseLifecycleSupport.firePhaseStarted(SolverPhaseLifecycleSupport.java:41)
at
org.optaplanner.core.impl.constructionheuristic.placer.AbstractEntityPlacer.phaseStarted(AbstractEntityPlacer.java:41)
at
org.optaplanner.core.impl.constructionheuristic.DefaultConstructionHeuristicSolverPhase.phaseStarted(DefaultConstructionHeuristicSolverPhase.java:120)
at
org.optaplanner.core.impl.constructionheuristic.DefaultConstructionHeuristicSolverPhase.solve(DefaultConstructionHeuristicSolverPhase.java:62)
at
org.optaplanner.core.impl.solver.DefaultSolver.runSolverPhases(DefaultSolver.java:190)
at
org.optaplanner.core.impl.solver.DefaultSolver.solve(DefaultSolver.java:155)
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2:58 a.m.
Exception in thread "main" java.lang.NullPointerException
at
com.example.domain.solver.MyVariableStrengthComparator.compare(MyVariableStrengthComparator.java:30)
That's an NPE in your code :)
(if that doesn't make any sense, any decent Java Programming
course/tutorial should cover how to diagnose and fix that)
On 28-11-13 13:32, newbie wrote:
Exception in thread "main" java.lang.NullPointerException
at
com.example.domain.solver.MyVariableStrengthComparator.compare(MyVariableStrengthComparator.java:30)
> at
>
com.example.domain.solver.MyVariableStrengthComparator.compare(MyVariableStrengthComparator.java:1)
> at java.util.Arrays.mergeSort(Arrays.java:1270)
> at java.util.Arrays.mergeSort(Arrays.java:1282)
> at java.util.Arrays.mergeSort(Arrays.java:1282)
> at java.util.Arrays.mergeSort(Arrays.java:1282)
> at java.util.Arrays.mergeSort(Arrays.java:1282)
> at java.util.Arrays.sort(Arrays.java:1210)
> at java.util.Collections.sort(Collections.java:159)
> at
>
org.optaplanner.core.impl.heuristic.selector.common.decorator.ComparatorSelectionSorter.sort(ComparatorSelectionSorter.java:28)
> at
>
org.optaplanner.core.impl.heuristic.selector.value.decorator.SortingValueSelector.constructCache(SortingValueSelector.java:43)
> at
>
org.optaplanner.core.impl.heuristic.selector.common.SelectionCacheLifecycleBridge.phaseStarted(SelectionCacheLifecycleBridge.java:48)
> at
>
org.optaplanner.core.impl.phase.event.SolverPhaseLifecycleSupport.firePhaseStarted(SolverPhaseLifecycleSupport.java:41)
> at
>
org.optaplanner.core.impl.heuristic.selector.AbstractSelector.phaseStarted(AbstractSelector.java:47)
> at
>
org.optaplanner.core.impl.phase.event.SolverPhaseLifecycleSupport.firePhaseStarted(SolverPhaseLifecycleSupport.java:41)
> at
>
org.optaplanner.core.impl.heuristic.selector.AbstractSelector.phaseStarted(AbstractSelector.java:47)
> at
>
org.optaplanner.core.impl.heuristic.selector.value.decorator.ReinitializeVariableValueSelector.phaseStarted(ReinitializeVariableValueSelector.java:52)
> at
>
org.optaplanner.core.impl.phase.event.SolverPhaseLifecycleSupport.firePhaseStarted(SolverPhaseLifecycleSupport.java:41)
> at
>
org.optaplanner.core.impl.heuristic.selector.AbstractSelector.phaseStarted(AbstractSelector.java:47)
> at
>
org.optaplanner.core.impl.phase.event.SolverPhaseLifecycleSupport.firePhaseStarted(SolverPhaseLifecycleSupport.java:41)
> at
>
org.optaplanner.core.impl.heuristic.selector.AbstractSelector.phaseStarted(AbstractSelector.java:47)
> at
>
org.optaplanner.core.impl.phase.event.SolverPhaseLifecycleSupport.firePhaseStarted(SolverPhaseLifecycleSupport.java:41)
> at
>
org.optaplanner.core.impl.constructionheuristic.placer.AbstractEntityPlacer.phaseStarted(AbstractEntityPlacer.java:41)
> at
>
org.optaplanner.core.impl.constructionheuristic.DefaultConstructionHeuristicSolverPhase.phaseStarted(DefaultConstructionHeuristicSolverPhase.java:120)
> at
>
org.optaplanner.core.impl.constructionheuristic.DefaultConstructionHeuristicSolverPhase.solve(DefaultConstructionHeuristicSolverPhase.java:62)
> at
>
org.optaplanner.core.impl.solver.DefaultSolver.runSolverPhases(DefaultSolver.java:190)
> at
> org.optaplanner.core.impl.solver.DefaultSolver.solve(DefaultSolver.java:155)
>
>
>
> --
> View this message in context:
http://drools.46999.n3.nabble.com/BEST-FIT-Null-Pointer-Exception-tp40269...
> Sent from the Drools: User forum mailing list archive at Nabble.com.
> _______________________________________________
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>
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days inactive
4016
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3 comments
2 participants
participants (2)
-
Geoffrey De Smet -
newbie