java.lang.NullPointerException
        at org.netbeans.modules.java.source.usages.RepositoryUpdater.dumpTopLevel(RepositoryUpdater.java:2918)
        at org.netbeans.modules.java.source.usages.RepositoryUpdater.dumpClasses(RepositoryUpdater.java:2897)
        at org.netbeans.modules.java.source.usages.RepositoryUpdater.access$4600(RepositoryUpdater.java:164)
        at org.netbeans.modules.java.source.usages.RepositoryUpdater$CompileWorker.updateFile(RepositoryUpdater.java:2057)
        at org.netbeans.modules.java.source.usages.RepositoryUpdater$CompileWorker.compileWithDeps(RepositoryUpdater.java:2280)
        at org.netbeans.modules.java.source.usages.RepositoryUpdater$CompileWorker.access$3000(RepositoryUpdater.java:1187)
        at org.netbeans.modules.java.source.usages.RepositoryUpdater$CompileWorker$1.run(RepositoryUpdater.java:1454)
        at org.netbeans.modules.java.source.usages.RepositoryUpdater$CompileWorker$1.run(RepositoryUpdater.java:1225)
        at org.netbeans.modules.java.source.usages.ClassIndexManager.writeLock(ClassIndexManager.java:100)
        at org.netbeans.modules.java.source.usages.RepositoryUpdater$CompileWorker.run(RepositoryUpdater.java:1222)
        at org.netbeans.modules.java.source.usages.RepositoryUpdater$CompileWorker.run(RepositoryUpdater.java:1187)
        at org.netbeans.api.java.source.JavaSource$CompilationJob.run(JavaSource.java:1457)
        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$Worker.runTask(ThreadPoolExecutor.java:885)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:907)
        at java.lang.Thread.run(Thread.java:619)