java.lang.NullPointerException
   at com.sun.tools.javac.code.Types.isSubtype(Types.java:814)
   at com.sun.tools.javac.code.Types.isSubtypeNoCapture(Types.java:807)
   at com.sun.tools.javac.code.Types$4.visitClassType(Types.java:926)
   at com.sun.tools.javac.code.Types$4.visitClassType(Types.java:844)
   at com.sun.tools.javac.code.Type$ClassType.accept(Type.java:778)
   at com.sun.tools.javac.code.Types$DefaultTypeVisitor.visit(Types.java:4498)
   at com.sun.tools.javac.code.Types.isSubtype(Types.java:840)
   at com.sun.tools.javac.code.Types.isSubtype(Types.java:804)
   at com.sun.tools.javac.code.Types$8.visitClassType(Types.java:1552)
   at com.sun.tools.javac.code.Types$8.visitClassType(Types.java:1504)
   at com.sun.tools.javac.code.Type$ClassType.accept(Type.java:778)
   at com.sun.tools.javac.code.Types$DefaultTypeVisitor.visit(Types.java:4498)
   at com.sun.tools.javac.code.Types.isCastable(Types.java:1495)
   at com.sun.tools.javac.code.Types.isCastable(Types.java:1473)
   at org.netbeans.api.java.source.TypeUtilities.isCastable(TypeUtilities.java:104)
   at org.netbeans.modules.java.hints.suggestions.TooStrongCast.broadTypeCast(TooStrongCast.java:201)
   at sun.reflect.GeneratedMethodAccessor170.invoke(GeneratedMethodAccessor170.java:0)
   at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
   at java.lang.reflect.Method.invoke(Method.java:497)
   at org.netbeans.modules.java.hints.providers.code.CodeHintProviderImpl$WorkerImpl.createErrors(CodeHintProviderImpl.java:339)
   at org.netbeans.modules.java.hints.spiimpl.hints.HintsInvoker.runHint(HintsInvoker.java:803)
   at org.netbeans.modules.java.hints.spiimpl.hints.HintsInvoker.doComputeHints(HintsInvoker.java:568)
   at org.netbeans.modules.java.hints.spiimpl.hints.HintsInvoker.computeHintsImpl(HintsInvoker.java:295)
   at org.netbeans.modules.java.hints.spiimpl.hints.HintsInvoker.computeHints(HintsInvoker.java:240)
   at org.netbeans.modules.java.hints.spiimpl.hints.HintsInvoker.computeHints(HintsInvoker.java:210)
   at org.netbeans.modules.java.hints.spiimpl.hints.HintsInvoker.computeHints(HintsInvoker.java:200)
   at org.netbeans.modules.java.hints.spiimpl.batch.BatchSearch$3.run(BatchSearch.java:294)
   at org.netbeans.modules.java.hints.spiimpl.batch.BatchSearch$3.run(BatchSearch.java:264)
   at org.netbeans.api.java.source.JavaSource$MultiTask.run(JavaSource.java:486)
   at org.netbeans.modules.parsing.impl.TaskProcessor.callUserTask(TaskProcessor.java:609)
   at org.netbeans.modules.parsing.api.ParserManager$MultiUserTaskAction.run(ParserManager.java:189)
   at org.netbeans.modules.parsing.api.ParserManager$MultiUserTaskAction.run(ParserManager.java:161)
   at org.netbeans.modules.parsing.impl.TaskProcessor$2.call(TaskProcessor.java:204)
   at org.netbeans.modules.parsing.impl.TaskProcessor$2.call(TaskProcessor.java:201)
   at org.netbeans.modules.masterfs.filebasedfs.utils.FileChangedManager.priorityIO(FileChangedManager.java:176)
   at org.netbeans.modules.masterfs.providers.ProvidedExtensions.priorityIO(ProvidedExtensions.java:360)
   at org.netbeans.modules.parsing.nb.DataObjectEnvFactory.runPriorityIO(DataObjectEnvFactory.java:141)
   at org.netbeans.modules.parsing.impl.Utilities.runPriorityIO(Utilities.java:88)
   at org.netbeans.modules.parsing.impl.TaskProcessor.runUserTask(TaskProcessor.java:201)
   at org.netbeans.modules.parsing.api.ParserManager.parse(ParserManager.java:106)
   at org.netbeans.api.java.source.JavaSource.runUserActionTaskImpl(JavaSource.java:436)
   at org.netbeans.api.java.source.JavaSource.runUserActionTask(JavaSource.java:407)
   at org.netbeans.modules.java.hints.spiimpl.batch.BatchSearch.getLocalVerifiedSpans(BatchSearch.java:264)
   at org.netbeans.modules.java.hints.spiimpl.batch.BatchSearch.access$600(BatchSearch.java:99)
   at org.netbeans.modules.java.hints.spiimpl.batch.BatchSearch$LocalIndexEnquirer.validateResource(BatchSearch.java:574)
   at org.netbeans.modules.java.hints.spiimpl.batch.BatchSearch.getVerifiedSpans(BatchSearch.java:207)
   at org.netbeans.modules.java.hints.spiimpl.batch.BatchUtilities.applyFixes(BatchUtilities.java:192)
   at org.netbeans.modules.java.hints.spiimpl.batch.BatchUtilities.applyFixes(BatchUtilities.java:135)
   at org.netbeans.modules.java.hints.spiimpl.refactoring.AbstractApplyHintsRefactoringPlugin.performApplyPattern(AbstractApplyHintsRefactoringPlugin.java:141)
   at org.netbeans.modules.java.hints.spiimpl.refactoring.FindDuplicatesRefactoringPlugin.performApplyPattern(FindDuplicatesRefactoringPlugin.java:121)
   at org.netbeans.modules.java.hints.spiimpl.refactoring.FindDuplicatesRefactoringPlugin.prepare(FindDuplicatesRefactoringPlugin.java:86)
   at org.netbeans.modules.refactoring.api.AbstractRefactoring.pluginsPrepare2(AbstractRefactoring.java:442)
   at org.netbeans.modules.refactoring.api.AbstractRefactoring.pluginsPrepare(AbstractRefactoring.java:426)
   at org.netbeans.modules.refactoring.api.AbstractRefactoring.prepare(AbstractRefactoring.java:237)
   at org.netbeans.modules.refactoring.spi.impl.ParametersPanel$Prepare.run(ParametersPanel.java:1059)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1443)
   at org.netbeans.modules.openide.util.GlobalLookup.execute(GlobalLookup.java:68)
   at org.openide.util.lookup.Lookups.executeWith(Lookups.java:303)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2058)