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$DefaultTypeVisitor.visit(Types.java:4498)
   at com.sun.tools.javac.code.Types.isCastable(Types.java:1495)
   at com.sun.tools.javac.code.Types.isCastable(Types.java:1473)
   at org.netbeans.api.java.source.TypeUtilities.isCastable(TypeUtilities.java:104)
   at org.netbeans.modules.java.hints.suggestions.TooStrongCast.broadTypeCast(TooStrongCast.java:201)
   at sun.reflect.GeneratedMethodAccessor171.invoke(GeneratedMethodAccessor171.java:0)
   at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
   at java.lang.reflect.Method.invoke(Method.java:498)
   at org.netbeans.modules.java.hints.providers.code.CodeHintProviderImpl$WorkerImpl.createErrors(CodeHintProviderImpl.java:339)
   at org.netbeans.modules.java.hints.spiimpl.hints.HintsInvoker.runHint(HintsInvoker.java:810)
   at org.netbeans.modules.java.hints.spiimpl.hints.HintsInvoker.doComputeHints(HintsInvoker.java:575)
   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:183)
   at org.netbeans.modules.java.hints.spiimpl.hints.HintsInvoker.computeHints(HintsInvoker.java:150)
   at org.netbeans.modules.java.hints.spiimpl.hints.HintsTask.run(HintsTask.java:137)
   at org.netbeans.modules.java.hints.spiimpl.hints.HintsTask.run(HintsTask.java:88)
   at org.netbeans.modules.java.source.JavaSourceAccessor$CancelableTaskWrapper.run(JavaSourceAccessor.java:298)
   at org.netbeans.modules.parsing.impl.TaskProcessor.callParserResultTask(TaskProcessor.java:584)
   at org.netbeans.modules.parsing.impl.TaskProcessor$RequestPerformer.run(TaskProcessor.java:809)
   at org.openide.util.lookup.Lookups.executeWith(Lookups.java:304)
   at org.netbeans.modules.parsing.impl.TaskProcessor$RequestPerformer.execute(TaskProcessor.java:725)
   at org.netbeans.modules.parsing.impl.TaskProcessor$CompilationJob.run(TaskProcessor.java:686)
   at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
   at java.util.concurrent.FutureTask.run(FutureTask.java:266)
   at org.openide.util.RequestProcessor$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)