java.lang.Throwable: Using stale writer, possibly forgotten call to store, old owner Thread Thread[Inactive RequestProcessor thread [Was:HintsController worker/org.netbeans.spi.editor.hints.HintsController$2],1,system], new owner Thread Thread[org.netbeans.modules.parsing.impl.indexing.IndexBinaryWorkPool$ConcurrentStrategy,1,system] .
   at org.netbeans.modules.parsing.lucene.LuceneIndex$DirCache$OwnerReference.assertNoModifiedWriter(LuceneIndex.java:1200)
   at org.netbeans.modules.parsing.lucene.LuceneIndex$DirCache.beginTx(LuceneIndex.java:898)
   at org.netbeans.modules.parsing.lucene.LuceneIndex.run(LuceneIndex.java:379)
   at org.netbeans.modules.java.source.usages.PersistentClassIndex$PIWriter.<init>(PersistentClassIndex.java:450)
   at org.netbeans.modules.java.source.usages.PersistentClassIndex.getBinaryAnalyser(PersistentClassIndex.java:121)
   at org.netbeans.modules.java.source.indexing.JavaBinaryIndexer.index(JavaBinaryIndexer.java:105)
   at org.netbeans.modules.parsing.spi.indexing.Indexable$MyAccessor$1.run(Indexable.java:149)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater.runIndexer(RepositoryUpdater.java:282)
   at org.netbeans.modules.parsing.spi.indexing.Indexable$MyAccessor.index(Indexable.java:147)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Work.indexBinary(RepositoryUpdater.java:2915)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$AbstractRootsWork.scanBinary(RepositoryUpdater.java:4839)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$AbstractRootsWork$1.apply(RepositoryUpdater.java:4782)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$AbstractRootsWork$1.apply(RepositoryUpdater.java:4779)
   at org.netbeans.modules.parsing.impl.indexing.IndexBinaryWorkPool$Task.call(IndexBinaryWorkPool.java:202)
   at org.netbeans.modules.parsing.impl.indexing.IndexBinaryWorkPool$Task.call(IndexBinaryWorkPool.java:185)
   at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
   at java.util.concurrent.FutureTask.run(FutureTask.java:166)
   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)