java.lang.NullPointerException
   at org.netbeans.modules.java.source.usages.ClassFileUtil.encodeType(ClassFileUtil.java:247)
   at org.netbeans.modules.java.source.usages.ClassFileUtil.createExecutableDescriptor(ClassFileUtil.java:198)
   at org.netbeans.api.java.source.ElementHandle.createImpl(ElementHandle.java:449)
   at org.netbeans.api.java.source.ElementHandle.create(ElementHandle.java:388)
   at org.netbeans.modules.java.navigation.CaretListeningTask.run(CaretListeningTask.java:184)
   at org.netbeans.modules.java.navigation.CaretListeningTask.run(CaretListeningTask.java:71)
   at org.netbeans.modules.java.source.JavaSourceAccessor$CancelableTaskWrapper.run(JavaSourceAccessor.java:298)
   at org.netbeans.modules.parsing.impl.TaskProcessor.callParserResultTask(TaskProcessor.java:559)
   at org.netbeans.modules.parsing.impl.TaskProcessor$CompilationJob.run(TaskProcessor.java:735)
   at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
   at java.util.concurrent.FutureTask.run(FutureTask.java:262)
   at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
   at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
   at java.lang.Thread.run(Thread.java:722)