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scalameta / metals

Scala language server with rich IDE features 🚀
https://scalameta.org/metals/
Apache License 2.0
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NoSuchElementException on lsp-ui-imenu #760

Closed iravid closed 5 years ago

iravid commented 5 years ago

Describe the bug Getting the following exception when calling lsp-ui-imenu in Emacs on ZIO.scala in https://github.com/zio/zio/blob/master/core/shared/src/main/scala/zio/ZIO.scala:

SEVERE: Internal error: java.util.NoSuchElementException
java.util.concurrent.CompletionException: java.util.NoSuchElementException
    at java.util.concurrent.CompletableFuture.encodeThrowable(CompletableFuture.java:292)
    at java.util.concurrent.CompletableFuture.completeThrowable(CompletableFuture.java:308)
    at java.util.concurrent.CompletableFuture.uniAccept(CompletableFuture.java:647)
    at java.util.concurrent.CompletableFuture$UniAccept.tryFire(CompletableFuture.java:632)
    at java.util.concurrent.CompletableFuture.postComplete(CompletableFuture.java:474)
    at java.util.concurrent.CompletableFuture.completeExceptionally(CompletableFuture.java:1977)
    at scala.meta.internal.metals.CancelTokens$.$anonfun$future$1(CancelTokens.scala:38)
    at scala.meta.internal.metals.CancelTokens$.$anonfun$future$1$adapted(CancelTokens.scala:36)
    at scala.concurrent.impl.CallbackRunnable.run(Promise.scala:64)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
    at java.lang.Thread.run(Thread.java:748)
Caused by: java.util.NoSuchElementException
    at java.util.ArrayList$Itr.next(ArrayList.java:862)
    at scala.collection.convert.Wrappers$JIteratorWrapper.next(Wrappers.scala:44)
    at scala.collection.IterableLike.head(IterableLike.scala:109)
    at scala.collection.IterableLike.head$(IterableLike.scala:108)
    at scala.collection.AbstractIterable.head(Iterable.scala:56)
    at scala.collection.TraversableLike.last(TraversableLike.scala:434)
    at scala.collection.TraversableLike.last$(TraversableLike.scala:433)
    at scala.collection.AbstractTraversable.last(Traversable.scala:108)
    at scala.meta.internal.metals.DocumentSymbolProvider$SymbolTraverser.continue$1(DocumentSymbolProvider.scala:85)
    at scala.meta.internal.metals.DocumentSymbolProvider$SymbolTraverser.newOwner$1(DocumentSymbolProvider.scala:90)
    at scala.meta.internal.metals.DocumentSymbolProvider$SymbolTraverser.apply(DocumentSymbolProvider.scala:169)
    at scala.meta.transversers.SimpleTraverser.$anonfun$apply$1(SimpleTraverser.scala:5)
    at scala.meta.transversers.SimpleTraverser.$anonfun$apply$1$adapted(SimpleTraverser.scala:5)
    at scala.collection.immutable.List.foreach(List.scala:392)
    at scala.meta.transversers.SimpleTraverser.apply(SimpleTraverser.scala:5)
    at scala.meta.internal.metals.DocumentSymbolProvider$SymbolTraverser.continue$1(DocumentSymbolProvider.scala:86)
    at scala.meta.internal.metals.DocumentSymbolProvider$SymbolTraverser.apply(DocumentSymbolProvider.scala:107)
    at scala.meta.transversers.SimpleTraverser.$anonfun$apply$1(SimpleTraverser.scala:5)
    at scala.meta.transversers.SimpleTraverser.$anonfun$apply$1$adapted(SimpleTraverser.scala:5)
    at scala.collection.immutable.List.foreach(List.scala:392)
    at scala.meta.transversers.SimpleTraverser.apply(SimpleTraverser.scala:5)
    at scala.meta.internal.metals.DocumentSymbolProvider$SymbolTraverser.continue$1(DocumentSymbolProvider.scala:86)
    at scala.meta.internal.metals.DocumentSymbolProvider$SymbolTraverser.newOwner$1(DocumentSymbolProvider.scala:90)
    at scala.meta.internal.metals.DocumentSymbolProvider$SymbolTraverser.apply(DocumentSymbolProvider.scala:152)
    at scala.meta.transversers.SimpleTraverser.$anonfun$apply$1(SimpleTraverser.scala:5)
    at scala.meta.transversers.SimpleTraverser.$anonfun$apply$1$adapted(SimpleTraverser.scala:5)
    at scala.collection.immutable.List.foreach(List.scala:392)
    at scala.meta.transversers.SimpleTraverser.apply(SimpleTraverser.scala:5)
    at scala.meta.internal.metals.DocumentSymbolProvider$SymbolTraverser.continue$1(DocumentSymbolProvider.scala:86)
    at scala.meta.internal.metals.DocumentSymbolProvider$SymbolTraverser.apply(DocumentSymbolProvider.scala:107)
    at scala.meta.transversers.SimpleTraverser.$anonfun$apply$1(SimpleTraverser.scala:5)
    at scala.meta.transversers.SimpleTraverser.$anonfun$apply$1$adapted(SimpleTraverser.scala:5)
    at scala.collection.immutable.List.foreach(List.scala:392)
    at scala.meta.transversers.SimpleTraverser.apply(SimpleTraverser.scala:5)
    at scala.meta.internal.metals.DocumentSymbolProvider$SymbolTraverser.continue$1(DocumentSymbolProvider.scala:86)
    at scala.meta.internal.metals.DocumentSymbolProvider$SymbolTraverser.newOwner$1(DocumentSymbolProvider.scala:90)
    at scala.meta.internal.metals.DocumentSymbolProvider$SymbolTraverser.apply(DocumentSymbolProvider.scala:116)
    at scala.meta.transversers.SimpleTraverser.$anonfun$apply$1(SimpleTraverser.scala:5)
    at scala.meta.transversers.SimpleTraverser.$anonfun$apply$1$adapted(SimpleTraverser.scala:5)
    at scala.collection.immutable.List.foreach(List.scala:392)
    at scala.meta.transversers.SimpleTraverser.apply(SimpleTraverser.scala:5)
    at scala.meta.internal.metals.DocumentSymbolProvider$SymbolTraverser.continue$1(DocumentSymbolProvider.scala:86)
    at scala.meta.internal.metals.DocumentSymbolProvider$SymbolTraverser.apply(DocumentSymbolProvider.scala:107)
    at scala.meta.transversers.SimpleTraverser.$anonfun$apply$1(SimpleTraverser.scala:5)
    at scala.meta.transversers.SimpleTraverser.$anonfun$apply$1$adapted(SimpleTraverser.scala:5)
    at scala.collection.immutable.List.foreach(List.scala:392)
    at scala.meta.transversers.SimpleTraverser.apply(SimpleTraverser.scala:5)
    at scala.meta.internal.metals.DocumentSymbolProvider$SymbolTraverser.continue$1(DocumentSymbolProvider.scala:86)
    at scala.meta.internal.metals.DocumentSymbolProvider$SymbolTraverser.newOwner$1(DocumentSymbolProvider.scala:90)
    at scala.meta.internal.metals.DocumentSymbolProvider$SymbolTraverser.apply(DocumentSymbolProvider.scala:134)
    at scala.meta.transversers.SimpleTraverser.$anonfun$apply$1(SimpleTraverser.scala:5)
    at scala.meta.transversers.SimpleTraverser.$anonfun$apply$1$adapted(SimpleTraverser.scala:5)
    at scala.collection.immutable.List.foreach(List.scala:392)
    at scala.meta.transversers.SimpleTraverser.apply(SimpleTraverser.scala:5)
    at scala.meta.internal.metals.DocumentSymbolProvider$SymbolTraverser.continue$1(DocumentSymbolProvider.scala:86)
    at scala.meta.internal.metals.DocumentSymbolProvider$SymbolTraverser.newOwner$1(DocumentSymbolProvider.scala:90)
    at scala.meta.internal.metals.DocumentSymbolProvider$SymbolTraverser.apply(DocumentSymbolProvider.scala:95)
    at scala.meta.transversers.SimpleTraverser.$anonfun$apply$1(SimpleTraverser.scala:5)
    at scala.meta.transversers.SimpleTraverser.$anonfun$apply$1$adapted(SimpleTraverser.scala:5)
    at scala.collection.immutable.List.foreach(List.scala:392)
    at scala.meta.transversers.SimpleTraverser.apply(SimpleTraverser.scala:5)
    at scala.meta.internal.metals.DocumentSymbolProvider$SymbolTraverser.continue$1(DocumentSymbolProvider.scala:86)
    at scala.meta.internal.metals.DocumentSymbolProvider$SymbolTraverser.apply(DocumentSymbolProvider.scala:107)
    at scala.meta.internal.metals.DocumentSymbolProvider$SymbolTraverser.symbols(DocumentSymbolProvider.scala:40)
    at scala.meta.internal.metals.DocumentSymbolProvider.documentSymbols(DocumentSymbolProvider.scala:24)
    at scala.meta.internal.metals.MetalsLanguageServer.documentSymbolResult(MetalsLanguageServer.scala:1455)
    at scala.meta.internal.metals.MetalsLanguageServer.$anonfun$documentSymbol$1(MetalsLanguageServer.scala:787)
    at scala.meta.internal.metals.CancelTokens$.$anonfun$apply$2(CancelTokens.scala:24)
    at scala.concurrent.Future$.$anonfun$apply$1(Future.scala:658)
    at scala.util.Success.$anonfun$map$1(Try.scala:255)
    at scala.util.Success.map(Try.scala:213)
    at scala.concurrent.Future.$anonfun$map$1(Future.scala:292)
    at scala.concurrent.impl.Promise.liftedTree1$1(Promise.scala:33)
    at scala.concurrent.impl.Promise.$anonfun$transform$1(Promise.scala:33)
    ... 4 more

To Reproduce Steps to reproduce the behavior:

  1. Import https://github.com/zio/zio
  2. Open ZIO.scala
  3. Call lsp-ui-imenu (or the equivalent in other editors)

Expected behavior The file overview is shown correctly.

Installation:

iravid commented 5 years ago

Thanks @tgodzik!