scala.reflect.internal.FatalError: class Object does not have a method getClass

[tgodzik]

I am raising it here because I have no idea how this can happen. Restarting the presentation compiler doesn't help only restarting the whole JVM does. It's also not possible to reproduce it reliably.

What is more when debugging I managed at some point to find that getClass did exist, but it had no flags at all. Anyone has any idea how it's possible? Any hints or debugging advice would be welcome

Reproduction steps

I can't reproduce it reliably and it seems to happen more often a time especially on latests metals with 2.13.15.

Problem

Presentation compiler stops being possible to use

Error stacktrace:

scala.reflect.internal.Definitions$DefinitionsClass.fatalMissingSymbol(Definitions.scala:1422)
	scala.reflect.internal.Definitions$DefinitionsClass.miss$1(Definitions.scala:1475)
	scala.reflect.internal.Definitions$DefinitionsClass.$anonfun$getMemberMethod$2(Definitions.scala:1477)
	scala.reflect.internal.Definitions$DefinitionsClass.getMemberMethod(Definitions.scala:1477)
	scala.reflect.internal.Definitions$DefinitionsClass.Any_getClass$lzycompute(Definitions.scala:1181)
	scala.reflect.internal.Definitions$DefinitionsClass.Any_getClass(Definitions.scala:1181)
	scala.reflect.internal.Definitions$DefinitionsClass.syntheticCoreMethods$lzycompute(Definitions.scala:1589)
	scala.reflect.internal.Definitions$DefinitionsClass.syntheticCoreMethods(Definitions.scala:1583)
	scala.reflect.internal.Definitions$DefinitionsClass.symbolsNotPresentInBytecode$lzycompute(Definitions.scala:1614)
	scala.reflect.internal.Definitions$DefinitionsClass.symbolsNotPresentInBytecode(Definitions.scala:1614)
	scala.reflect.internal.Definitions$DefinitionsClass.init(Definitions.scala:1669)
	scala.tools.nsc.Global$Run.<init>(Global.scala:1263)
	scala.tools.nsc.interactive.Global$TyperRun.<init>(Global.scala:1351)
	scala.tools.nsc.interactive.Global.newTyperRun(Global.scala:1374)
	scala.tools.nsc.interactive.Global.<init>(Global.scala:294)
	scala.meta.internal.pc.MetalsGlobal.<init>(MetalsGlobal.scala:44)
	scala.meta.internal.pc.ScalaPresentationCompiler.newCompiler(ScalaPresentationCompiler.scala:522)

scalac options

-Yrangepos -Wunused -Xsource:3 -Wconf:msg=in anonymous function is never used:silent -Wconf:src=*.BasePCSuite.scala&msg=parameter (scalaVersion|classpath) in method (extraDependencies|scalacOptions):silent -Wconf:src=*.CodeLens.scala&msg=parameter (textDocumentWithPath|path) in method codeLenses is never used:silent -Wconf:src=*.Completions.scala&msg=parameter (member|m) in method (isCandidate|isPrioritized):silent -Wconf:src=*.JavaMtags.scala&msg=parameter (ctor|method) in method (visitConstructor|visitMethod):silent -Wconf:src=*.MtagsIndexer.scala&msg=parameter owner in method visitOccurrence:silent -Wconf:src=*.ScaladocParser.scala&msg=parameter (pos|message) in method reportError:silent -Wconf:src=*.TreeViewProvider.scala&msg=parameter params in method (children|parent) is never used:silent -Wconf:src=*.InheritanceContext.scala&msg=parameter ec in method getLocations is never used:silent -Wconf:src=*.CompilerWrapper.scala&msg=parameter params in method compiler is never used:silent -Wconf:src=.*(CompletionProvider|ArgCompletions|Completions|Keywords|IndentOnPaste).scala&msg=The outer reference:silent -Xplugin-require:semanticdb -release 17

classpath

<WORKSPACE>/tests/unit/src/test/resources [exists ], <WORKSPACE>/.bloop/unit/bloop-bsp-clients-classes/test-classes-Metals-hsGx1FlFQIGvtTBJOnsNXA== [exists ], <HOME>/.cache/bloop/semanticdb/com.sourcegraph.semanticdb-javac.0.10.3/semanticdb-javac-0.10.3.jar [exists ], <WORKSPACE>/tests/unit/target/scala-2.13/resource_managed/main [exists ], <WORKSPACE>/.bloop/unit/bloop-bsp-clients-classes/classes-Metals-hsGx1FlFQIGvtTBJOnsNXA== [exists ], <WORKSPACE>/.bloop/mtest/bloop-bsp-clients-classes/classes-Metals-hsGx1FlFQIGvtTBJOnsNXA== [exists ], <WORKSPACE>/mtags/src/main/resources [exists ], <WORKSPACE>/.bloop/mtags/bloop-bsp-clients-classes/classes-Metals-hsGx1FlFQIGvtTBJOnsNXA== [exists ], <WORKSPACE>/.bloop/mtagsShared/bloop-bsp-clients-classes/classes-Metals-hsGx1FlFQIGvtTBJOnsNXA== [exists ], <WORKSPACE>/.bloop/interfaces/bloop-bsp-clients-classes/classes-Metals-hsGx1FlFQIGvtTBJOnsNXA== [exists ], <WORKSPACE>/metals/src/main/resources [exists ], <WORKSPACE>/.bloop/metals/bloop-bsp-clients-classes/classes-Metals-hsGx1FlFQIGvtTBJOnsNXA== [exists ], <WORKSPACE>/.bloop/mtags-java/bloop-bsp-clients-classes/classes-Metals-hsGx1FlFQIGvtTBJOnsNXA== [exists ], <HOME>/.cache/coursier/v1/https/repo1.maven.org/maven2/org/scala-lang/scala-library/2.13.15/scala-library-2.13.15.jar [exists ], <HOME>/.cache/coursier/v1/https/repo1.maven.org/maven2/io/get-coursier/coursier_2.13/2.1.14/coursier_2.13-2.1.14.jar [exists ], <HOME>/.cache/coursier/v1/https/repo1.maven.org/maven2/ch/epfl/scala/bloop-config_2.13/2.0.3/bloop-config_2.13-2.0.3.jar [exists ], <HOME>/.cache/coursier/v1/https/repo1.maven.org/maven2/org/scalameta/munit_2.13/1.0.2/munit_2.13-1.0.2.jar [exists ], <HOME>/.cache/coursier/v1/https/repo1.maven.org/maven2/io/get-coursier/interface/1.0.21/interface-1.0.21.jar [exists ], <HOME>/.cache/coursier/v1/https/repo1.maven.org/maven2/org/eclipse/jdt/org.eclipse.jdt.core/3.25.0/org.eclipse.jdt.core-3.25.0.jar [exists ], <HOME>/.cache/coursier/v1/https/repo1.maven.org/maven2/org/eclipse/platform/org.eclipse.ant.core/3.5.500/org.eclipse.ant.core-3.5.500.jar [exists ], <HOME>/.cache/coursier/v1/https/repo1.maven.org/maven2/org/eclipse/platform/org.eclipse.compare.core/3.6.600/org.eclipse.compare.core-3.6.600.jar [exists ], <HOME>/.cache/coursier/v1/https/repo1.maven.org/maven2/org/eclipse/platform/org.eclipse.core.commands/3.9.500/org.eclipse.core.commands-3.9.500.jar [exists ], <HOME>/.cache/coursier/v1/https/repo1.maven.org/maven2/org/eclipse/platform/org.eclipse.core.contenttype/3.7.500/org.eclipse.core.contenttype-3.7.500.jar [exists ], <HOME>/.cache/coursier/v1/https/repo1.maven.org/maven2/org/eclipse/platform/org.eclipse.core.expressions/3.6.500/org.eclipse.core.expressions-3.6.500.jar [exists ], <HOME>/.cache/coursier/v1/https/repo1.maven.org/maven2/org/eclipse/platform/org.eclipse.core.filesystem/1.7.500/org.eclipse.core.filesystem-1.7.500.jar [exists ], 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More about it in scalameta/metals#5272

[lrytz]

So we fail in

    def getMemberMethod(owner: Symbol, name: Name): TermSymbol = {
      def miss = fatalMissingSymbol(owner, name, "method")
      getMember(owner, name.toTermName) match {
        case x: TermSymbol => x.filter(_.isMethod).orElse(miss).asInstanceOf[TermSymbol] // <<<< `miss`
        case _             => miss
      }
    }

where owner is ObjectClass, name is getClass, some x: TermSymbol is found but isMethod is false.

I have to look a bit closer how interactive.Global does things, I think it creates new a global.Run often. Symbol instances (like ObjectClass or the TermSymbol for getClass) are kept between compiler runs, but they go through adaptToNewRunMap i think. I thought maybe there's something wrong there, maybe some missing lock and a race.

But if "Restarting the presentation compiler doesn't help" that sounds like a different cause...

[tgodzik]

I started getting it more often now, so I will try and connect debugger again.

[lrytz]

Which repo..? Does it happen randomly, or only after longer sessions?

[tgodzik]

In the scalameta/metals repository, but some people reported it happen in other repositories. It seems to happen quite randomly, but at that point everything is broken.

Might be connected to regenerating bloop config or switching branches a lot, but I could not make it reliably reproduce

[tgodzik]

Ok it seems, everything in java.lang package has error type. Is it possible it's all due to using -release 17 flag ? It does seems to happen more if I have Metals running on a different version than defined for a project.

[lrytz]

Seems possible.. It still didn't reproduce for me. Being able to debug it would be great..

[tgodzik]

I am trying out to run Metals on the same version as the project version to see if the problem ever happens without -release. If it doesn't break I will try to maybe run a test case multiple times to see if I am able to force it to break.

[tgodzik]

Ok, so this is reproducible when -release flag is added, but it takes a while sometimes to happen. I will probably try some workarounds.

Btw. any idea where types might break when using -release? I can try to debug those places.

[tgodzik]

I think this only happens with -release 17 I managed to reproduce it on a smaller project even.

The way to reproduce it locally if anyone has the time would be to do:

//> using scala 2.13.15
//> using options -release:17

object O {
  implicit def aString: String = "a"
  implicit def lengthOfString(implicit s: String): Int = s.length
  implicit def toLong(implicit i: Int): Long = i.toLong

  def toDouble(implicit l: Long): Double = l.toDouble

  def hello = {
    toDouble
  }

}

though I haven't managed to do it reliably.

[tgodzik]

I did a workaround and now we remove -release flag for 17 and higher. Looks like that is the main culprit.

[lrytz]

Doesn't this lead to inconsistencies? E.g., when running on 21 with a project that uses -release 17, the presentation compiler would show API of 21 that's not there on 17.

I was hoping to take a look at this one but didn't yet manage to reproduce, and I don't have much time currenlty...

[tgodzik]

It will show inconsistencies, but it's better than not showing anything at all 😅

No worries, it's a really weird one to reproduce, if you are able to point me to a specific part of code that might be responsible I can also just try to debug it myself once it breaks

[tgodzik]

I have a suspicion that we have a similar issue in Scala 3 scala/scala3#21947

Looks like that happens especially when compiling scala CLI from command line and from Metals at the same time. Though this should not happen, but is it possible that the state gets somehow corrupted?