java.lang.NullPointerException
   at java.util.Collections$UnmodifiableCollection.<init>(Collections.java:1027)
   at java.util.Collections$UnmodifiableList.<init>(Collections.java:1303)
   at java.util.Collections.unmodifiableList(Collections.java:1290)
   at com.sun.tools.javac.code.Symbol$ModuleSymbol.getDirectives(Symbol.java:987)
   at org.netbeans.modules.java.navigation.ElementScanningTask$PositionVisitor.visitModule(ElementScanningTask.java:300)
   at org.netbeans.modules.java.navigation.ElementScanningTask$PositionVisitor.visitModule(ElementScanningTask.java:239)
   at com.sun.tools.javac.tree.JCTree$JCModuleDecl.accept(JCTree.java:2701)
   at com.sun.source.util.TreePathScanner.scan(TreePathScanner.java:82)
   at org.netbeans.modules.java.navigation.ElementScanningTask$PositionVisitor.scan(ElementScanningTask.java:316)
   at org.netbeans.modules.java.navigation.ElementScanningTask$PositionVisitor.scan(ElementScanningTask.java:239)
   at com.sun.source.util.TreeScanner.scan(TreeScanner.java:105)
   at com.sun.source.util.TreeScanner.scanAndReduce(TreeScanner.java:113)
   at com.sun.source.util.TreeScanner.visitCompilationUnit(TreeScanner.java:144)
   at org.netbeans.modules.java.navigation.ElementScanningTask$PositionVisitor.visitCompilationUnit(ElementScanningTask.java:262)
   at org.netbeans.modules.java.navigation.ElementScanningTask$PositionVisitor.visitCompilationUnit(ElementScanningTask.java:239)
   at com.sun.tools.javac.tree.JCTree$JCCompilationUnit.accept(JCTree.java:593)
   at com.sun.source.util.TreePathScanner.scan(TreePathScanner.java:82)
   at org.netbeans.modules.java.navigation.ElementScanningTask$PositionVisitor.scan(ElementScanningTask.java:316)
   at org.netbeans.modules.java.navigation.ElementScanningTask.runImpl(ElementScanningTask.java:149)
   at org.netbeans.modules.java.navigation.ElementScanningTask.run(ElementScanningTask.java:121)
   at org.netbeans.modules.java.navigation.ElementScanningTask.run(ElementScanningTask.java:102)
   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$RunnableAdapter.call(Executors.java:514)
   at java.util.concurrent.FutureTask.run(FutureTask.java:264)
   at org.openide.util.RequestProcessor$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)