com-lihaoyi
Crash in IntelliJ BSP import
I get this in the Build tool window in the Sync tab:
request failed: buildTarget/scalacOptions
bsp error: Internal error. (-32603)
I found IntelliJ's BSP trace logs, which includes the response object. It looks like this:
[Trace - 01:05:29 AM] Received response 'buildTarget/scalacOptions - (29)' in 387ms
Result: null
Error: {
"code": -32603,
"message": "Internal error.",
"data": "java.util.concurrent.CompletionException: [...]
It was a long string with a lot of \ns in it. I unescaped it to make it legible:
java.util.concurrent.CompletionException: java.lang.Exception: Failure during task evaluation: app_common.test.compile scala.reflect.internal.MissingRequirementError: object java.lang.Object in compiler mirror not found.
scala.reflect.internal.MissingRequirementError$.notFound(MissingRequirementError.scala:24)
scala.reflect.internal.Mirrors$RootsBase.$anonfun$getModuleOrClass$6(Mirrors.scala:63)
scala.reflect.internal.Mirrors$RootsBase.getModuleOrClass(Mirrors.scala:63)
scala.reflect.internal.Mirrors$RootsBase.getModuleOrClass(Mirrors.scala:55)
scala.reflect.internal.Mirrors$RootsBase.getRequiredClass(Mirrors.scala:55)
scala.reflect.internal.Definitions$DefinitionsClass.ObjectClass$lzycompute(Definitions.scala:289)
scala.reflect.internal.Definitions$DefinitionsClass.ObjectClass(Definitions.scala:289)
scala.reflect.internal.Definitions$DefinitionsClass.init(Definitions.scala:1650)
scala.tools.nsc.Global$Run.<init>(Global.scala:1236)
xsbt.ZincCompiler$ZincRun.<init>(CallbackGlobal.scala:80)
xsbt.CachedCompiler0.run(CompilerBridge.scala:161)
xsbt.CachedCompiler0.run(CompilerBridge.scala:134)
xsbt.CompilerBridge.run(CompilerBridge.scala:39)
sbt.internal.inc.AnalyzingCompiler.compile(AnalyzingCompiler.scala:91)
sbt.internal.inc.MixedAnalyzingCompiler.$anonfun$compile$7(MixedAnalyzingCompiler.scala:193)
scala.runtime.java8.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.scala:18)
sbt.internal.inc.MixedAnalyzingCompiler.timed(MixedAnalyzingCompiler.scala:248)
sbt.internal.inc.MixedAnalyzingCompiler.$anonfun$compile$4(MixedAnalyzingCompiler.scala:183)
sbt.internal.inc.MixedAnalyzingCompiler.$anonfun$compile$4$adapted(MixedAnalyzingCompiler.scala:163)
sbt.internal.inc.JarUtils$.withPreviousJar(JarUtils.scala:239)
sbt.internal.inc.MixedAnalyzingCompiler.compileScala$1(MixedAnalyzingCompiler.scala:163)
sbt.internal.inc.MixedAnalyzingCompiler.compile(MixedAnalyzingCompiler.scala:211)
sbt.internal.inc.IncrementalCompilerImpl.$anonfun$compileInternal$1(IncrementalCompilerImpl.scala:534)
sbt.internal.inc.IncrementalCompilerImpl.$anonfun$compileInternal$1$adapted(IncrementalCompilerImpl.scala:534)
sbt.internal.inc.Incremental$.$anonfun$apply$5(Incremental.scala:179)
sbt.internal.inc.Incremental$.$anonfun$apply$5$adapted(Incremental.scala:177)
sbt.internal.inc.Incremental$$anon$2.run(Incremental.scala:463)
sbt.internal.inc.IncrementalCommon$CycleState.next(IncrementalCommon.scala:116)
sbt.internal.inc.IncrementalCommon$$anon$1.next(IncrementalCommon.scala:56)
sbt.internal.inc.IncrementalCommon$$anon$1.next(IncrementalCommon.scala:52)
sbt.internal.inc.IncrementalCommon.cycle(IncrementalCommon.scala:263)
sbt.internal.inc.Incremental$.$anonfun$incrementalCompile$8(Incremental.scala:418)
sbt.internal.inc.Incremental$.withClassfileManager(Incremental.scala:506)
sbt.internal.inc.Incremental$.incrementalCompile(Incremental.scala:405)
sbt.internal.inc.Incremental$.apply(Incremental.scala:171)
sbt.internal.inc.IncrementalCompilerImpl.compileInternal(IncrementalCompilerImpl.scala:534)
sbt.internal.inc.IncrementalCompilerImpl.$anonfun$compileIncrementally$1(IncrementalCompilerImpl.scala:488)
sbt.internal.inc.IncrementalCompilerImpl.handleCompilationError(IncrementalCompilerImpl.scala:332)
sbt.internal.inc.IncrementalCompilerImpl.compileIncrementally(IncrementalCompilerImpl.scala:425)
sbt.internal.inc.IncrementalCompilerImpl.compile(IncrementalCompilerImpl.scala:137)
mill.scalalib.worker.ZincWorkerImpl.compileInternal(ZincWorkerImpl.scala:561)
mill.scalalib.worker.ZincWorkerImpl.$anonfun$compileMixed0$1(ZincWorkerImpl.scala:339)
mill.api.FixSizedCache.withCachedValue(FixSizedCache.scala:66)
mill.scalalib.worker.ZincWorkerImpl.withCompilers(ZincWorkerImpl.scala:421)
mill.scalalib.worker.ZincWorkerImpl.compileMixed0(ZincWorkerImpl.scala:338)
mill.scalalib.worker.ZincWorkerImpl.compileMixed(ZincWorkerImpl.scala:306)
mill.scalalib.ScalaModule.$anonfun$compile$2(ScalaModule.scala:198)
mill.define.Task$TraverseCtx.evaluate(Task.scala:380)
at java.base/java.util.concurrent.CompletableFuture.encodeThrowable(CompletableFuture.java:332)
at java.base/java.util.concurrent.CompletableFuture.completeThrowable(CompletableFuture.java:347)
at java.base/java.util.concurrent.CompletableFuture$UniAccept.tryFire(CompletableFuture.java:708)
at java.base/java.util.concurrent.CompletableFuture.postComplete(CompletableFuture.java:510)
at java.base/java.util.concurrent.CompletableFuture.completeExceptionally(CompletableFuture.java:2162)
at mill.bsp.MillBuildServer.$anonfun$completable$1(MillBuildServer.scala:734)
at mill.bsp.MillBuildServer.$anonfun$completable$1$adapted(MillBuildServer.scala:722)
at scala.concurrent.impl.Promise$Transformation.run(Promise.scala:484)
at java.base/java.util.concurrent.ForkJoinTask$RunnableExecuteAction.exec(ForkJoinTask.java:1395)
at java.base/java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:373)
at java.base/java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(ForkJoinPool.java:1182)
at java.base/java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:1655)
at java.base/java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1622)
at java.base/java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:165)
Caused by: java.lang.Exception: Failure during task evaluation: app_common.test.compile scala.reflect.internal.MissingRequirementError: object java.lang.Object in compiler mirror not found.
scala.reflect.internal.MissingRequirementError$.notFound(MissingRequirementError.scala:24)
scala.reflect.internal.Mirrors$RootsBase.$anonfun$getModuleOrClass$6(Mirrors.scala:63)
scala.reflect.internal.Mirrors$RootsBase.getModuleOrClass(Mirrors.scala:63)
scala.reflect.internal.Mirrors$RootsBase.getModuleOrClass(Mirrors.scala:55)
scala.reflect.internal.Mirrors$RootsBase.getRequiredClass(Mirrors.scala:55)
scala.reflect.internal.Definitions$DefinitionsClass.ObjectClass$lzycompute(Definitions.scala:289)
scala.reflect.internal.Definitions$DefinitionsClass.ObjectClass(Definitions.scala:289)
scala.reflect.internal.Definitions$DefinitionsClass.init(Definitions.scala:1650)
scala.tools.nsc.Global$Run.<init>(Global.scala:1236)
xsbt.ZincCompiler$ZincRun.<init>(CallbackGlobal.scala:80)
xsbt.CachedCompiler0.run(CompilerBridge.scala:161)
xsbt.CachedCompiler0.run(CompilerBridge.scala:134)
xsbt.CompilerBridge.run(CompilerBridge.scala:39)
sbt.internal.inc.AnalyzingCompiler.compile(AnalyzingCompiler.scala:91)
sbt.internal.inc.MixedAnalyzingCompiler.$anonfun$compile$7(MixedAnalyzingCompiler.scala:193)
scala.runtime.java8.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.scala:18)
sbt.internal.inc.MixedAnalyzingCompiler.timed(MixedAnalyzingCompiler.scala:248)
sbt.internal.inc.MixedAnalyzingCompiler.$anonfun$compile$4(MixedAnalyzingCompiler.scala:183)
sbt.internal.inc.MixedAnalyzingCompiler.$anonfun$compile$4$adapted(MixedAnalyzingCompiler.scala:163)
sbt.internal.inc.JarUtils$.withPreviousJar(JarUtils.scala:239)
sbt.internal.inc.MixedAnalyzingCompiler.compileScala$1(MixedAnalyzingCompiler.scala:163)
sbt.internal.inc.MixedAnalyzingCompiler.compile(MixedAnalyzingCompiler.scala:211)
sbt.internal.inc.IncrementalCompilerImpl.$anonfun$compileInternal$1(IncrementalCompilerImpl.scala:534)
sbt.internal.inc.IncrementalCompilerImpl.$anonfun$compileInternal$1$adapted(IncrementalCompilerImpl.scala:534)
sbt.internal.inc.Incremental$.$anonfun$apply$5(Incremental.scala:179)
sbt.internal.inc.Incremental$.$anonfun$apply$5$adapted(Incremental.scala:177)
sbt.internal.inc.Incremental$$anon$2.run(Incremental.scala:463)
sbt.internal.inc.IncrementalCommon$CycleState.next(IncrementalCommon.scala:116)
sbt.internal.inc.IncrementalCommon$$anon$1.next(IncrementalCommon.scala:56)
sbt.internal.inc.IncrementalCommon$$anon$1.next(IncrementalCommon.scala:52)
sbt.internal.inc.IncrementalCommon.cycle(IncrementalCommon.scala:263)
sbt.internal.inc.Incremental$.$anonfun$incrementalCompile$8(Incremental.scala:418)
sbt.internal.inc.Incremental$.withClassfileManager(Incremental.scala:506)
sbt.internal.inc.Incremental$.incrementalCompile(Incremental.scala:405)
sbt.internal.inc.Incremental$.apply(Incremental.scala:171)
sbt.internal.inc.IncrementalCompilerImpl.compileInternal(IncrementalCompilerImpl.scala:534)
sbt.internal.inc.IncrementalCompilerImpl.$anonfun$compileIncrementally$1(IncrementalCompilerImpl.scala:488)
sbt.internal.inc.IncrementalCompilerImpl.handleCompilationError(IncrementalCompilerImpl.scala:332)
sbt.internal.inc.IncrementalCompilerImpl.compileIncrementally(IncrementalCompilerImpl.scala:425)
sbt.internal.inc.IncrementalCompilerImpl.compile(IncrementalCompilerImpl.scala:137)
mill.scalalib.worker.ZincWorkerImpl.compileInternal(ZincWorkerImpl.scala:561)
mill.scalalib.worker.ZincWorkerImpl.$anonfun$compileMixed0$1(ZincWorkerImpl.scala:339)
mill.api.FixSizedCache.withCachedValue(FixSizedCache.scala:66)
mill.scalalib.worker.ZincWorkerImpl.withCompilers(ZincWorkerImpl.scala:421)
mill.scalalib.worker.ZincWorkerImpl.compileMixed0(ZincWorkerImpl.scala:338)
mill.scalalib.worker.ZincWorkerImpl.compileMixed(ZincWorkerImpl.scala:306)
mill.scalalib.ScalaModule.$anonfun$compile$2(ScalaModule.scala:198)
mill.define.Task$TraverseCtx.evaluate(Task.scala:380)
at mill.eval.Evaluator$.$anonfun$evalOrThrow$default$2$1(Evaluator.scala:1006)
at mill.eval.Evaluator$EvalOrThrow.apply(Evaluator.scala:995)
at mill.bsp.MillBuildServer.targetTasks(MillBuildServer.scala:695)
at mill.bsp.MillScalaBuildServer.$anonfun$buildTargetScalacOptions$1(MillScalaBuildServer.scala:35)
at mill.bsp.MillBuildServer.$anonfun$completable$1(MillBuildServer.scala:725)
... 8 more
Here is the bsp file contents that IntelliJ is using:
{"name":"mill-bsp","argv":["/home/naftoli/bin/mill","--bsp","--disable-ticker","--color","false","--jobs","1", "--debug"],"millVersion":"0.10.12","bspVersion":"2.0.0","languages":["scala","java"]}
I don't know why scalacOptions has to run app_common.test.compile but invoking it manually works:
❯ mill -i app_common.test.compile
[1259/1277] app_common.test.resources
Wait, so then I did another import and checked the last occurence in the logs and it was the same error on a different module (selenium_tests.test.compile), and when I invoked that manually it succeeded, and then I ran import again, and it worked!
Could be also IJ, which is in heavy refactoring regarding BSP. What version do you use? Could you cross-check how Metals behaves, e.g. with vscode? You can also inspect .bsp/mill-bsp.stderr to see what Mill reports.
It wasn't generating the stderr file. But this is what intellij says mill actually returned in its response to intellij.
That can't be right. If there is no .bsp/mill-bsp.stderr file, IJ is likely not running the Mill BSP server (version 0.10.12) at all. At least, I can't believe right now, that a Mill process is generating the BSP response you posted above. It's more likely the error message comes from IJ directly, but ended in the .trace file. Mill is also writing a BSP trace file to .bsp/mill-bsp.trace. If this isn't there, too, it's an issue in IJ and you should report it there to get it fixed or acknowledged.
I don't remember the exact sequence of events. It was a few days ago, and even after the workaround I described Ctrl-F9 was using the IDEA builder, and it was tedious to do the workaround every time I reimported, so I went back to sbt. So my memory is a little hazy.
However, there sometimes were those files but maybe I had to add --debug for them to get new content. Initially they were there and I deleted them and they didn't come back when I imported, but it's possible it just took a number of tries until IntelliJ was calling it with --debug. Anyway I see those files now and they're huge but I found what seems like the same error in mill-bsp.stderr. I extracted part of it to a gist:
https://gist.github.com/nafg/9ed02e141f5f70ecacadffeb1c9b0f43
If you start Mill with the --bsp option, it's using STDIN/OUT to speak the Build Server Protocol (BSP) which is based on JSON-RPC. You can then interact with it. Of course you can use nc (netcat) if you know what you're doing.
Hi, sorry for not responding earlier -- I had to switch back to sbt and have been very busy.
Here are the relevant build files: https://gist.github.com/nafg/8bf78893a54fa8ead7d61586cd499880