scala.tools.nsc.symtab.Symbols$CyclicReference: illegal cyclic reference involving method doCrawl
   at scala.tools.nsc.symtab.Symbols$Symbol$$anonfun$info$3.apply(Symbols.java:722)
   at scala.tools.nsc.symtab.Symbols$Symbol$$anonfun$info$3.apply(Symbols.java:720)
   at scala.Function0$class.apply$mcV$sp(Function0.java:34)
   at scala.runtime.AbstractFunction0.apply$mcV$sp(AbstractFunction0.java:12)
   at scala.tools.nsc.symtab.Symbols$Symbol.lock(Symbols.java:308)
   at scala.tools.nsc.symtab.Symbols$Symbol.info(Symbols.java:720)
   at scala.tools.nsc.symtab.Symbols$Symbol.tpe(Symbols.java:704)
   at org.netbeans.modules.scala.editor.ScalaVirtualSourceProvider$JavaStubGenerator$$anonfun$genMemebers$2.apply(ScalaVirtualSourceProvider.java:434)
   at org.netbeans.modules.scala.editor.ScalaVirtualSourceProvider$JavaStubGenerator$$anonfun$genMemebers$2.apply(ScalaVirtualSourceProvider.java:432)
   at scala.collection.TraversableLike$WithFilter$$anonfun$foreach$1.apply(TraversableLike.java:704)
   at scala.collection.LinearSeqOptimized$class.foreach(LinearSeqOptimized.java:59)
   at scala.collection.immutable.List.foreach(List.java:45)
   at scala.collection.TraversableLike$WithFilter.foreach(TraversableLike.java:703)
   at org.netbeans.modules.scala.editor.ScalaVirtualSourceProvider$JavaStubGenerator.genMemebers(ScalaVirtualSourceProvider.java:432)
   at org.netbeans.modules.scala.editor.ScalaVirtualSourceProvider$JavaStubGenerator.genClass(ScalaVirtualSourceProvider.java:379)
   at org.netbeans.modules.scala.editor.ScalaVirtualSourceProvider$$anon$1$$anonfun$process$7.apply(ScalaVirtualSourceProvider.java:233)
   at org.netbeans.modules.scala.editor.ScalaVirtualSourceProvider$$anon$1$$anonfun$process$7.apply(ScalaVirtualSourceProvider.java:220)
   at scala.collection.mutable.HashMap$$anonfun$foreach$1.apply(HashMap.java:93)
   at scala.collection.mutable.HashMap$$anonfun$foreach$1.apply(HashMap.java:93)
   at scala.collection.Iterator$class.foreach(Iterator.java:652)
   at scala.collection.mutable.HashTable$$anon$1.foreach(HashTable.java:157)
   at scala.collection.mutable.HashTable$class.foreachEntry(HashTable.java:190)
   at scala.collection.mutable.HashMap.foreachEntry(HashMap.java:43)
   at scala.collection.mutable.HashMap.foreach(HashMap.java:93)
   at org.netbeans.modules.scala.editor.ScalaVirtualSourceProvider$$anon$1.process(ScalaVirtualSourceProvider.java:220)
   at org.netbeans.modules.scala.editor.ScalaVirtualSourceProvider$$anon$1.run(ScalaVirtualSourceProvider.java:164)
   at org.netbeans.modules.parsing.impl.TaskProcessor.callUserTask(TaskProcessor.java:649)
   at org.netbeans.modules.parsing.api.ParserManager$UserTaskAction.run(ParserManager.java:154)
   at org.netbeans.modules.parsing.api.ParserManager$UserTaskAction.run(ParserManager.java:138)
   at org.netbeans.modules.parsing.impl.TaskProcessor$2.call(TaskProcessor.java:217)
   at org.netbeans.modules.parsing.impl.TaskProcessor$2.call(TaskProcessor.java:214)
   at org.netbeans.modules.masterfs.filebasedfs.utils.FileChangedManager.priorityIO(FileChangedManager.java:168)
   at org.netbeans.modules.masterfs.providers.ProvidedExtensions.priorityIO(ProvidedExtensions.java:356)
   at org.netbeans.modules.parsing.impl.Utilities.runPriorityIO(Utilities.java:71)
   at org.netbeans.modules.parsing.impl.TaskProcessor.runUserTask(TaskProcessor.java:214)
   at org.netbeans.modules.parsing.api.ParserManager.parse(ParserManager.java:106)
   at org.netbeans.modules.scala.editor.ScalaVirtualSourceProvider.translate(ScalaVirtualSourceProvider.java:155)
   at org.netbeans.modules.scala.editor.ScalaVirtualSourceProvider.translate(ScalaVirtualSourceProvider.java:139)
   at org.netbeans.modules.java.source.usages.VirtualSourceProviderQuery.translate(VirtualSourceProviderQuery.java:152)
   at org.netbeans.modules.java.source.indexing.JavaCustomIndexer.translateVirtualSources(JavaCustomIndexer.java:296)
   at org.netbeans.modules.java.source.indexing.JavaCustomIndexer.index(JavaCustomIndexer.java:158)
   at org.netbeans.modules.parsing.spi.indexing.Indexable$MyAccessor$2.run(Indexable.java:153)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater.runIndexer(RepositoryUpdater.java:271)
   at org.netbeans.modules.parsing.spi.indexing.Indexable$MyAccessor.index(Indexable.java:151)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$RefreshCifIndices.getDone(RepositoryUpdater.java:2645)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Work.doTheWork(RepositoryUpdater.java:2255)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Task._run(RepositoryUpdater.java:4029)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Task.run(RepositoryUpdater.java:3969)
   at org.netbeans.modules.parsing.impl.TaskProcessor.callParserResultTask(TaskProcessor.java:624)
   at org.netbeans.modules.parsing.impl.TaskProcessor$CompilationJob.run(TaskProcessor.java:734)
   at java.util.concurrent.Executors$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)