Error while fetching testClass in Scala JS project

[tgodzik]

Based on https://users.scala-lang.org/t/scalajs-error-scala-test-classes-not-supported-by-server/10488/8

INFO  Scala test classes not supported by server
org.eclipse.lsp4j.jsonrpc.ResponseErrorException: java.lang.reflect.InvocationTargetException
	at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:118)
	at java.base/java.lang.reflect.Method.invoke(Method.java:580)
	at bloop.engine.tasks.toolchains.ScalaJsToolchain.discoverTestFrameworks(ScalaJsToolchain.scala:98)
	at bloop.engine.tasks.TestTask$.$anonfun$discoverTestFrameworks$5(TestTask.scala:234)
	at bloop.task.Task.$anonfun$runAsync$7(Task.scala:265)
	at scala.Function1.$anonfun$andThen$1(Function1.scala:57)
	at monix.eval.Task$Map.apply(Task.scala:4604)
	at monix.eval.Task$Map.apply(Task.scala:4600)
	at monix.eval.internal.TaskRunLoop$.startFull(TaskRunLoop.scala:170)
	at monix.eval.internal.TaskRestartCallback.syncOnSuccess(TaskRestartCallback.scala:101)
	at monix.eval.internal.TaskRestartCallback.onSuccess(TaskRestartCallback.scala:74)
	at monix.eval.internal.TaskCreate$CallbackForCreate.run(TaskCreate.scala:252)
	at monix.execution.internal.Trampoline.monix$execution$internal$Trampoline$$immediateLoop(Trampoline.scala:66)
	at monix.execution.internal.Trampoline.startLoop(Trampoline.scala:32)
	at monix.execution.schedulers.TrampolineExecutionContext$JVMOptimalTrampoline.startLoop(TrampolineExecutionContext.scala:132)
	at monix.execution.internal.Trampoline.execute(Trampoline.scala:40)
	at monix.execution.schedulers.TrampolineExecutionContext.execute(TrampolineExecutionContext.scala:57)
	at monix.execution.schedulers.BatchingScheduler.execute(BatchingScheduler.scala:50)
	at monix.execution.schedulers.BatchingScheduler.execute$(BatchingScheduler.scala:47)
	at monix.execution.schedulers.AsyncScheduler.execute(AsyncScheduler.scala:31)
	at monix.eval.internal.TaskCreate$CallbackForCreate.startExecution(TaskCreate.scala:236)
	at monix.eval.internal.TaskCreate$CallbackForCreate.tryOnSuccess(TaskCreate.scala:202)
	at monix.eval.internal.TaskCreate$CallbackForCreate.onSuccess(TaskCreate.scala:195)
	at bloop.task.Task$.result$2(Task.scala:465)
	at bloop.task.Task$.$anonfun$parSequenceUnordered$3(Task.scala:475)
	at bloop.task.Task$.$anonfun$parSequenceUnordered$3$adapted(Task.scala:473)
	at scala.concurrent.impl.CallbackRunnable.run(Promise.scala:74)
	at java.base/java.util.concurrent.ForkJoinTask$RunnableExecuteAction.compute(ForkJoinTask.java:1726)
	at java.base/java.util.concurrent.ForkJoinTask$RunnableExecuteAction.compute(ForkJoinTask.java:1717)
	at java.base/java.util.concurrent.ForkJoinTask$InterruptibleTask.exec(ForkJoinTask.java:1641)
	at java.base/java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:507)
	at java.base/java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(ForkJoinPool.java:1458)
	at java.base/java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:2034)
	at java.base/java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:189)
Caused by: org.scalajs.testing.common.RPCCore$ClosedException: org.scalajs.testing.adapter.JSEnvRPC$RunTerminatedException
	at org.scalajs.testing.common.RPCCore.helpClose(RPCCore.scala:223)
	at org.scalajs.testing.common.RPCCore.close(RPCCore.scala:215)
	at org.scalajs.testing.adapter.JSEnvRPC.close(JSEnvRPC.scala:69)
	at org.scalajs.testing.adapter.JSEnvRPC.$anonfun$new$1(JSEnvRPC.scala:60)
	at org.scalajs.testing.adapter.JSEnvRPC.$anonfun$new$1$adapted(JSEnvRPC.scala:60)
	... 8 more
Caused by: org.scalajs.testing.adapter.JSEnvRPC$RunTerminatedException
	... 10 more
Caused by: org.scalajs.jsenv.ExternalJSRun$NonZeroExitException: exited with code 1
	at org.scalajs.jsenv.ExternalJSRun$$anon$1.run(ExternalJSRun.scala:200)

	at org.eclipse.lsp4j.jsonrpc.RemoteEndpoint.handleResponse(RemoteEndpoint.java:220)
	at org.eclipse.lsp4j.jsonrpc.RemoteEndpoint.consume(RemoteEndpoint.java:204)
	at scala.meta.internal.metals.RequestMonitorImpl$$anon$1.consume(ServerLivenessMonitor.scala:41)
	at org.eclipse.lsp4j.jsonrpc.json.StreamMessageProducer.handleMessage(StreamMessageProducer.java:185)
	at org.eclipse.lsp4j.jsonrpc.json.StreamMessageProducer.listen(StreamMessageProducer.java:97)
	at org.eclipse.lsp4j.jsonrpc.json.ConcurrentMessageProcessor.run(ConcurrentMessageProcessor.java:114)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:572)
	at java.util.concurrent.FutureTask.run(FutureTask.java:317)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1144)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:642)
	at java.lang.Thread.run(Thread.java:1575)

[dillius]

Just ran into this myself when testing out a ScalaJS project in VSCode for once instead of IntelliJ. Have no idea when/what may have changed because it was my first time using Metals.

[tgodzik]

If you ever manage to share a reproduction I would be most thankful! In the meantime I plan to add some more logging