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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<HOME>/.cache/coursier/v1/https/repo1.maven.org/maven2/org/scalameta/common_2.13/4.10.1/common_2.13-4.10.1.jar [exists ]

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.