[rules-users] BEST_FIT Null Pointer Exception

[newbie]

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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