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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