java.lang.NullPointerException
   at org.netbeans.modules.java.editor.overridden.ComputeOverriders.findReverseSourceRoots(ComputeOverriders.java:112)
   at org.netbeans.modules.java.editor.overridden.ComputeOverriders.reverseSourceRootsInOrder(ComputeOverriders.java:294)
   at org.netbeans.modules.java.editor.overridden.ComputeOverriders.computeUsers(ComputeOverriders.java:352)
   at org.netbeans.modules.java.editor.overridden.ComputeOverriders.processImpl(ComputeOverriders.java:217)
   at org.netbeans.modules.java.editor.overridden.ComputeOverriders.process(ComputeOverriders.java:173)
   at org.netbeans.modules.java.editor.overridden.ComputeAnnotations.computeAnnotations(ComputeAnnotations.java:114)
   at org.netbeans.modules.java.editor.overridden.ComputeAnnotations.run(ComputeAnnotations.java:99)
   at org.netbeans.modules.parsing.impl.TaskProcessor$CompilationJob.run(TaskProcessor.java:654)
   at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
   at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
   at java.util.concurrent.FutureTask.run(FutureTask.java:138)
   at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
   at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
   at java.lang.Thread.run(Thread.java:619)