java.lang.Throwable
	at org.netbeans.modules.parsing.lucene.LuceneIndex$DirCache.doClose(LuceneIndex.java:806)
	at org.netbeans.modules.parsing.lucene.LuceneIndex$DirCache.close(LuceneIndex.java:772)
	at org.netbeans.modules.parsing.lucene.LuceneIndex.close(LuceneIndex.java:526)
	at org.netbeans.modules.java.source.usages.PersistentClassIndex.close(PersistentClassIndex.java:426)
	at org.netbeans.modules.java.source.usages.ClassIndexManager.close(ClassIndexManager.java:225)
	at org.netbeans.modules.java.source.JBrowseModule.close(JBrowseModule.java:68)
	at org.netbeans.core.startup.NbInstaller.closeAsync(NbInstaller.java:743)
	at org.netbeans.ModuleManager.shutDownAsync(ModuleManager.java:1981)
	at org.netbeans.core.startup.ModuleSystem.shutDownAsync(ModuleSystem.java:349)
	at org.netbeans.core.NbLifeExit.doExit(NbLifeExit.java:137)
	at org.netbeans.core.NbLifeExit.run(NbLifeExit.java:94)
	at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:251)
	at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:733)
	at java.awt.EventQueue.access$200(EventQueue.java:103)
	at java.awt.EventQueue$3.run(EventQueue.java:694)
	at java.awt.EventQueue$3.run(EventQueue.java:692)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
	at java.awt.EventQueue.dispatchEvent(EventQueue.java:703)
	at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:159)
	at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:242)
	at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:161)
	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:146)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:138)
	at java.awt.EventDispatchThread.run(EventDispatchThread.java:91)
Caused: org.netbeans.modules.parsing.lucene.support.Index$IndexClosedException
	at org.netbeans.modules.parsing.lucene.LuceneIndex$DirCache.checkPreconditions(LuceneIndex.java:1094)
	at org.netbeans.modules.parsing.lucene.LuceneIndex$DirCache.doClear(LuceneIndex.java:678)
	at org.netbeans.modules.parsing.lucene.LuceneIndex$DirCache.clear(LuceneIndex.java:661)
	at org.netbeans.modules.parsing.lucene.LuceneIndex.clear(LuceneIndex.java:515)
	at org.netbeans.modules.java.source.usages.PersistentClassIndex$PIWriter.clear(PersistentClassIndex.java:457)
	at org.netbeans.modules.java.source.usages.PersistentIndexTransaction.handleBrokenRoot(PersistentIndexTransaction.java:142)
	at org.netbeans.modules.java.source.usages.PersistentIndexTransaction.rollBack(PersistentIndexTransaction.java:114)
	at org.netbeans.modules.java.source.indexing.TransactionContext.rollBack(TransactionContext.java:128)
Caused: java.io.IOException
	at org.netbeans.modules.java.source.indexing.TransactionContext.rollBack(TransactionContext.java:138)
[catch] at org.netbeans.modules.java.source.indexing.JavaCustomIndexer$Factory.scanFinished(JavaCustomIndexer.java:1000)
	at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Work.scanFinished(RepositoryUpdater.java:2417)
	at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Work.scanFiles(RepositoryUpdater.java:3095)
	at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$FileListWork.getDone(RepositoryUpdater.java:3544)
	at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Work.doTheWork(RepositoryUpdater.java:3205)
	at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Task._run(RepositoryUpdater.java:5643)
	at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Task.access$4900(RepositoryUpdater.java:5309)
	at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Task$3$1.run(RepositoryUpdater.java:5568)
	at org.netbeans.modules.parsing.impl.RunWhenScanFinishedSupport.performScan(RunWhenScanFinishedSupport.java:96)
	at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Task$3.call(RepositoryUpdater.java:5564)
	at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Task$3.call(RepositoryUpdater.java:5560)
	at org.netbeans.modules.masterfs.filebasedfs.utils.FileChangedManager.priorityIO(FileChangedManager.java:176)
	at org.netbeans.modules.masterfs.providers.ProvidedExtensions.priorityIO(ProvidedExtensions.java:360)
	at org.netbeans.modules.parsing.impl.Utilities.runPriorityIO(Utilities.java:74)
	at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Task.run(RepositoryUpdater.java:5560)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
	at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
	at java.util.concurrent.FutureTask.run(FutureTask.java:166)
	at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1432)
	at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2042)