Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Jump to bottom

sporadic reflect error calling .tpe on compiler-generated type tag #9530

Closed
scabug opened this issue Oct 22, 2015 · 3 comments
Closed

sporadic reflect error calling .tpe on compiler-generated type tag #9530

scabug opened this issue Oct 22, 2015 · 3 comments
Assignees
@retronym
Labels
reflection

Comments

@scabug
Copy link

scabug commented Oct 22, 2015

In a unit test that has run hundreds of times, exactly once so far there was a runtime exception when accessing .tpe on a compiler-inserted type tag. Whatever it is, it's nondeterministic and low-probability (which is just what you want from your runtime).

Can't reproduce. But as a curiosity here's the stacktrace.

[error] 
[error] scala.reflect.runtime.ReflectError: value org is not a package
[error] 
[error] STACKTRACE
[error]   scala.reflect.runtime.JavaMirrors$JavaMirror.scala$reflect$runtime$JavaMirrors$$makeScalaPackage(JavaMirrors.scala:915)
[error]   scala.reflect.runtime.JavaMirrors$JavaMirror.packageNameToScala(JavaMirrors.scala:891)
[error]   scala.reflect.runtime.JavaMirrors$JavaMirror.scala$reflect$runtime$JavaMirrors$$makeScalaPackage(JavaMirrors.scala:902)
[error]   scala.reflect.runtime.JavaMirrors$class.missingHook(JavaMirrors.scala:1299)
[error]   scala.reflect.runtime.JavaUniverse.missingHook(JavaUniverse.scala:12)
[error]   scala.reflect.internal.Mirrors$RootsBase.universeMissingHook(Mirrors.scala:77)
[error]   scala.reflect.internal.Mirrors$RootsBase.missingHook(Mirrors.scala:79)
[error]   scala.reflect.internal.pickling.UnPickler$Scan.readExtSymbol$1(UnPickler.scala:226)
[error]   scala.reflect.internal.pickling.UnPickler$Scan.readSymbol(UnPickler.scala:250)
[error]   scala.reflect.internal.pickling.UnPickler$Scan.readSymbolRef(UnPickler.scala:783)
[error]   scala.reflect.internal.pickling.UnPickler$Scan.readExtSymbol$1(UnPickler.scala:200)
[error]   scala.reflect.internal.pickling.UnPickler$Scan.readSymbol(UnPickler.scala:250)
[error]   scala.reflect.internal.pickling.UnPickler$Scan.readSymbolRef(UnPickler.scala:783)
[error]   scala.reflect.internal.pickling.UnPickler$Scan.readType(UnPickler.scala:335)
[error]   scala.reflect.internal.pickling.UnPickler$Scan$$anonfun$readTypeRef$1.apply(UnPickler.scala:792)
[error]   scala.reflect.internal.pickling.UnPickler$Scan$$anonfun$readTypeRef$1.apply(UnPickler.scala:792)
[error]   scala.reflect.internal.pickling.UnPickler$Scan.at(UnPickler.scala:171)
[error]   scala.reflect.internal.pickling.UnPickler$Scan.readTypeRef(UnPickler.scala:792)
[error]   scala.reflect.internal.pickling.UnPickler$Scan.readType(UnPickler.scala:345)
[error]   scala.reflect.internal.pickling.UnPickler$Scan$$anonfun$readTypeRef$1.apply(UnPickler.scala:792)
[error]   scala.reflect.internal.pickling.UnPickler$Scan$$anonfun$readTypeRef$1.apply(UnPickler.scala:792)
[error]   scala.reflect.internal.pickling.UnPickler$Scan.at(UnPickler.scala:171)
[error]   scala.reflect.internal.pickling.UnPickler$Scan.readTypeRef(UnPickler.scala:792)
[error]   scala.reflect.internal.pickling.UnPickler$Scan$$anonfun$readType$2.apply(UnPickler.scala:356)
[error]   scala.reflect.internal.pickling.UnPickler$Scan$$anonfun$readType$2.apply(UnPickler.scala:356)
[error]   scala.reflect.internal.pickling.PickleBuffer.until(PickleBuffer.scala:163)
[error]   scala.reflect.internal.pickling.UnPickler$Scan.readType(UnPickler.scala:356)
[error]   scala.reflect.internal.pickling.UnPickler$Scan$LazyTypeRef$$anonfun$34.apply(UnPickler.scala:855)
[error]   scala.reflect.internal.pickling.UnPickler$Scan$LazyTypeRef$$anonfun$34.apply(UnPickler.scala:855)
[error]   scala.reflect.internal.pickling.UnPickler$Scan.at(UnPickler.scala:171)
[error]   scala.reflect.internal.pickling.UnPickler$Scan$LazyTypeRef.complete(UnPickler.scala:855)
[error]   scala.reflect.internal.Symbols$Symbol.info(Symbols.scala:1231)
[error]   scala.reflect.internal.Types$TypeRef.thisInfo(Types.scala:2407)
[error]   scala.reflect.internal.Types$TypeRef.baseClasses(Types.scala:2412)
[error]   scala.reflect.internal.Types$Type.findMember(Types.scala:1173)
[error]   scala.reflect.internal.Types$Type.memberBasedOnName(Types.scala:722)
[error]   scala.reflect.internal.Types$Type.member(Types.scala:680)
[error]   scala.reflect.internal.Mirrors$RootsBase.getModuleOrClass(Mirrors.scala:43)
[error]   scala.reflect.internal.Mirrors$RootsBase.getModuleOrClass(Mirrors.scala:61)
[error]   scala.reflect.internal.Mirrors$RootsBase.staticModuleOrClass(Mirrors.scala:72)
[error]   scala.reflect.internal.Mirrors$RootsBase.staticClass(Mirrors.scala:119)
[error]   scala.reflect.internal.Mirrors$RootsBase.staticClass(Mirrors.scala:21)
[error]   doobie.util.compositespec$LenStr2$$typecreator2$1.apply(composite.scala:16)
[error]   scala.reflect.api.TypeTags$WeakTypeTagImpl.tpe$lzycompute(TypeTags.scala:231)
[error]   scala.reflect.api.TypeTags$WeakTypeTagImpl.tpe(TypeTags.scala:231)
[error]   doobie.util.meta$Meta$$anon$1.<init>(meta.scala:195)



That's the business up there ... remainder of stacktrace below, if it matters.



[error]   doobie.util.meta$Meta$.basic(meta.scala:194)
[error]   doobie.util.meta$Meta$$anon$1.xmap(meta.scala:202)
[error]   doobie.util.meta$Meta$class.nxmap(meta.scala:71)
[error]   doobie.util.meta$Meta$$anon$1.nxmap(meta.scala:194)
[error]   doobie.util.compositespec$LenStr2$.<init>(composite.scala:16)
[error]   doobie.util.compositespec$LenStr2$.<clinit>(composite.scala)
[error]   doobie.util.compositespec$$anonfun$3$$anonfun$apply$10$$anonfun$apply$5.apply$mcI$sp(composite.scala:52)
[error]   doobie.util.compositespec$$anonfun$3$$anonfun$apply$10$$anonfun$apply$5.apply(composite.scala:52)
[error]   doobie.util.compositespec$$anonfun$3$$anonfun$apply$10$$anonfun$apply$5.apply(composite.scala:52)
[error]   org.specs2.matcher.Expectable.value$lzycompute(Expectable.scala:20)
[error]   org.specs2.matcher.Expectable.value(Expectable.scala:20)0m
[error]   org.specs2.matcher.BeTypedEqualTo.apply(BeTypedEqualTo.scala:44)
[error]   org.specs2.matcher.Expectable.applyMatcher(Expectable.scala:50)
[error]   org.specs2.matcher.MustThrownExpectationsCreation$$anon$4.applyMatcher(MustExpectations.scala:64)
[error]   org.specs2.matcher.MustExpectable.must_$eq$eq(MustExpectable.scala:17)
[error]   doobie.util.compositespec$$anonfun$3$$anonfun$apply$10.apply(composite.scala:52)
[error]   doobie.util.compositespec$$anonfun$3$$anonfun$apply$10.apply(composite.scala:52)
[error]   org.specs2.matcher.MatchResult$$anon$12$$anonfun$asResult$1.apply(MatchResult.scala:310)
[error]   org.specs2.matcher.MatchResult$$anon$12$$anonfun$asResult$1.apply(MatchResult.scala:310)
[error]   org.specs2.execute.ResultExecution$class.execute(ResultExecution.scala:25)
[error]   org.specs2.execute.ResultExecution$.execute(ResultExecution.scala:120)
[error]   org.specs2.execute.Result$$anon$10.asResult(Result.scala:230)
[error]   org.specs2.execute.AsResult$.apply(AsResult.scala:25)
[error]   org.specs2.matcher.MatchResult$$anon$12.asResult(MatchResult.scala:310)
[error]   org.specs2.execute.AsResult$.apply(AsResult.scala:25)
[error]   org.specs2.main.CommandLineAsResult$$anon$1.asResult(CommandLineAsResult.scala:17)
[error]   org.specs2.main.CommandLineAsResult$$anonfun$apply$1.apply(CommandLineAsResult.scala:21)
[error]   org.specs2.main.CommandLineAsResult$$anonfun$apply$1.apply(CommandLineAsResult.scala:21)
[error]   org.specs2.specification.dsl.mutable.ExampleDsl1$BlockExample$$anonfun$$greater$greater$1.apply(ExampleDsl.scala:39)
[error]   org.specs2.specification.dsl.mutable.ExampleDsl1$BlockExample$$anonfun$$greater$greater$1.apply(ExampleDsl.scala:39)
[error]   org.specs2.specification.core.Execution$$anonfun$withEnv$1$$anonfun$apply$3.apply(Execution.scala:120)
[error]   org.specs2.execute.ResultExecution$class.execute(ResultExecution.scala:25)
[error]   org.specs2.execute.ResultExecution$.execute(ResultExecution.scala:120)
[error]   org.specs2.execute.Result$$anon$10.asResult(Result.scala:230)
[error]   org.specs2.execute.AsResult$.apply(AsResult.scala:25)
[error]   org.specs2.specification.core.Execution$$anonfun$withEnv$1.apply(Execution.scala:120)
[error]   org.specs2.specification.core.Execution$$anonfun$withEnv$1.apply(Execution.scala:120)
[error]   org.specs2.specification.core.Execution$$anonfun$execute$2$$anonfun$apply$2.apply(Execution.scala:70)
[error]   org.specs2.specification.core.Execution$$anonfun$execute$2$$anonfun$apply$2.apply(Execution.scala:70)
[error]   org.specs2.specification.core.Execution.setResult(Execution.scala:76)
[error]   org.specs2.specification.core.Execution$$anonfun$execute$2.apply(Execution.scala:70)
[error]   org.specs2.specification.core.Execution$$anonfun$execute$2.apply(Execution.scala:70)
[error]   scala.Option.fold(Option.scala:157)
[error]   org.specs2.specification.core.Execution.execute(Execution.scala:70)
[error]   org.specs2.specification.process.DefaultExecutor$$anonfun$executeFragment$1$$anonfun$apply$6.apply(Executor.scala:132)
[error]   org.specs2.specification.process.DefaultExecutor$$anonfun$executeFragment$1$$anonfun$apply$6.apply(Executor.scala:130)
[error]   org.specs2.specification.core.Fragment.updateExecution(Fragment.scala:44)
[error]   org.specs2.specification.process.DefaultExecutor$$anonfun$executeFragment$1.apply(Executor.scala:130)
[error]   org.specs2.specification.process.DefaultExecutor$$anonfun$executeFragment$1.apply(Executor.scala:129)
[error]   org.specs2.specification.process.DefaultExecutor$$anonfun$sequencedExecution$1.executedFragment$lzycompute$1(Executor.scala:104)
[error]   org.specs2.specification.process.DefaultExecutor$$anonfun$sequencedExecution$1.org$specs2$specification$process$DefaultExecutor$class$$anonfun$$executedFragment$1(Executor.scala:104)
[error]   org.specs2.specification.process.DefaultExecutor$$anonfun$sequencedExecution$1$$anonfun$4.apply(Executor.scala:110)
[error]   org.specs2.specification.process.DefaultExecutor$$anonfun$sequencedExecution$1$$anonfun$4.apply(Executor.scala:110)
[error]   scalaz.concurrent.Task$.Try(Task.scala:386)
[error]   org.specs2.data.Processes$$anonfun$start$1.apply(Processes.scala:96)
[error]   org.specs2.data.Processes$$anonfun$start$1.apply(Processes.scala:96)
[error]   scalaz.concurrent.Future$$anonfun$apply$15$$anon$4.call(Future.scala:380)
[error]   scalaz.concurrent.Future$$anonfun$apply$15$$anon$4.call(Future.scala:380)
[error]   java.util.concurrent.FutureTask.run(FutureTask.java:262)
[error]   java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
[error]   java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
[error]   java.lang.Thread.run(Thread.java:745)
[error]
@scabug
Copy link
Author

scabug commented Oct 22, 2015

Imported From: https://issues.scala-lang.org/browse/SI-9530?orig=1
Reporter: Rob Norris (rnorris)
Affected Versions: 2.10.5

@scabug
Copy link
Author

scabug commented Oct 23, 2015

@retronym said:
Given that you've reported the issue against Scala 2.10, my hunch is that the source of the error is multi-threaded access to the reflection API. In Scala 2.11, we've added internal locks to make it threadsafe.

Perhaps you can test this hypothesis by configuring Specs to run your tests sequentially.

@scabug
Copy link
Author

scabug commented Oct 23, 2015

Rob Norris (rnorris) said:
Because it has only happened once in thousands of runs I'm not sure if that will really prove anything ... I'm just going to leave it as-is and I'll report back if it becomes reproduceable or ever happens in >= 2.11.

Thanks!

@scabug scabug closed this as completed Oct 25, 2015
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment
Assignees

@retronym retronym

Labels
reflection
Projects
None yet
Milestone
No milestone
Development

No branches or pull requests
2 participants
@retronym @scabug