Re: [rules-users] BEST_FIT Null Pointer Exception

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.