java.lang.NullPointerException
   at com.sun.tools.javac.tree.TreeInfo.getStartPos(TreeInfo.java:426)
   at com.sun.tools.javac.api.JavacTrees$1.getStartPosition(JavacTrees.java:147)
   at org.netbeans.api.java.source.TreeUtilities$1PathFinder.scan(TreeUtilities.java:274)
   at org.netbeans.api.java.source.TreeUtilities$1PathFinder.scan(TreeUtilities.java:263)
   at com.sun.source.util.TreeScanner.scanAndReduce(TreeScanner.java:80)
   at com.sun.source.util.TreeScanner.scan(TreeScanner.java:90)
   at com.sun.source.util.TreeScanner.scanAndReduce(TreeScanner.java:98)
   at com.sun.source.util.TreeScanner.visitClass(TreeScanner.java:132)
   at com.sun.tools.javac.tree.JCTree$JCClassDecl.accept(JCTree.java:674)
   at com.sun.source.util.TreePathScanner.scan(TreePathScanner.java:67)
   at org.netbeans.api.java.source.TreeUtilities$1PathFinder.scan(TreeUtilities.java:279)
   at org.netbeans.api.java.source.TreeUtilities$1PathFinder.scan(TreeUtilities.java:263)
   at com.sun.source.util.TreeScanner.scan(TreeScanner.java:90)
   at com.sun.source.util.TreeScanner.scanAndReduce(TreeScanner.java:98)
   at com.sun.source.util.TreeScanner.visitCompilationUnit(TreeScanner.java:119)
   at com.sun.tools.javac.tree.JCTree$JCCompilationUnit.accept(JCTree.java:544)
   at com.sun.source.util.TreePathScanner.scan(TreePathScanner.java:49)
   at org.netbeans.api.java.source.TreeUtilities.pathFor(TreeUtilities.java:310)
   at org.netbeans.api.java.source.TreeUtilities.pathFor(TreeUtilities.java:247)
   at org.netbeans.api.java.source.TreeUtilities.pathFor(TreeUtilities.java:241)
   at org.netbeans.modules.java.navigation.CaretListeningTask.run(CaretListeningTask.java:137)
   at org.netbeans.modules.java.navigation.CaretListeningTask.run(CaretListeningTask.java:71)
   at org.netbeans.modules.java.source.JavaSourceAccessor$CancelableTaskWrapper.run(JavaSourceAccessor.java:298)
   at org.netbeans.modules.parsing.impl.TaskProcessor.callParserResultTask(TaskProcessor.java:558)
   at org.netbeans.modules.parsing.impl.TaskProcessor$CompilationJob.run(TaskProcessor.java:734)
   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)