java.lang.NullPointerException
   at com.sun.tools.javac.comp.MemberEnter$Synthesizer.visit(MemberEnter.java:1707)
   at com.sun.tools.javac.comp.MemberEnter$9.getModelType(MemberEnter.java:1689)
   at com.sun.tools.javac.code.Symbol$ClassSymbol.getSuperclass(Symbol.java:1074)
   at com.sun.tools.javac.code.Symbol$ClassSymbol.getSuperclass(Symbol.java:906)
   at org.netbeans.modules.java.navigation.ElementScanningTask.createHtmlHeader(ElementScanningTask.java:411)
   at org.netbeans.modules.java.navigation.ElementScanningTask.element2description(ElementScanningTask.java:257)
   at org.netbeans.modules.java.navigation.ElementScanningTask.runImpl(ElementScanningTask.java:141)
   at org.netbeans.modules.java.navigation.ElementScanningTask.run(ElementScanningTask.java:104)
   at org.netbeans.modules.java.navigation.ElementScanningTask.run(ElementScanningTask.java:85)
   at org.netbeans.modules.java.source.JavaSourceAccessor$CancelableTaskWrapper.run(JavaSourceAccessor.java:298)
   at org.netbeans.modules.parsing.impl.TaskProcessor.callParserResultTask(TaskProcessor.java:573)
   at org.netbeans.modules.parsing.impl.TaskProcessor$CompilationJob.run(TaskProcessor.java:744)
   at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
   at java.util.concurrent.FutureTask.run(FutureTask.java:266)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1423)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2033)