Timeouts from bloop-rifle and watch mode issues since 1.5.x.

[keynmol]

Version(s)
1.5.4

Describe the bug
Very frequent timeouts from bloop-rifle, and watch mode occasionally refusing to pick up changes - only restarting helps, but then it crashes again

https://discord.com/channels/632150470000902164/901153021638082660/1312768811602284617

To Reproduce

I get it constantly when working on https://github.com/keynmol/cue4s-xterm-demo but I've seen it in all projects that I have that use --watch mode.

Just run scala-cli --power package . -w -f -o scalajs-frontend.js --js-module-kind es and edit files for a bit - eventually it will crash.

Expected behaviour

Doesn't crash or times out

[Gedochao]

Yeah... I can reproduce it alright.
Not sure what's going on here just yet, but thanks for raising the issue.
I suspect that whatever is happening is something introduced by #3218.

[Gedochao]

So... to reproduce it, it's enough to just run:

@main def main(): Unit = println("Hello")

with

scala-cli run . --watch

and then modify the file 5 times.

Here's the stacktrace:

java.lang.Exception: Timeout while waiting for buildInitialize response
  bloop.rifle.BloopServer$.buildServer(BloopServer.scala:223)
  scala.build.compiler.BloopCompilerMaker.$anonfun$1(BloopCompilerMaker.scala:48)
  scala.build.compiler.BloopCompiler.<init>(BloopCompiler.scala:15)
  scala.build.compiler.BloopCompilerMaker.$anonfun$2(BloopCompilerMaker.scala:51)
  scala.util.Try$.apply(Try.scala:217)
  scala.build.compiler.BloopCompilerMaker.create(BloopCompilerMaker.scala:51)
  scala.build.Build$.info$1$$anonfun$1(Build.scala:697)
  scala.build.EitherCps$Helper.apply(EitherCps.scala:19)
  scala.build.Build$.info$1(Build.scala:687)
  scala.build.Build$.run$1(Build.scala:715)
  scala.build.Build$.$anonfun$24(Build.scala:748)
  scala.build.Build$.$anonfun$adapted$1(Build.scala:748)
  scala.Function0.apply$mcV$sp(Function0.scala:42)
  scala.build.Build$Watcher.$init$$$anonfun$1(Build.scala:1274)
  java.base@17.0.6/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:539)
  java.base@17.0.6/java.util.concurrent.FutureTask.run(FutureTask.java:264)
  java.base@17.0.6/java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:304)
  java.base@17.0.6/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136)
  java.base@17.0.6/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)
  java.base@17.0.6/java.lang.Thread.run(Thread.java:833)
  com.oracle.svm.core.thread.PlatformThreads.threadStartRoutine(PlatformThreads.java:775)
  com.oracle.svm.core.posix.thread.PosixPlatformThreads.pthreadStartRoutine(PosixPlatformThreads.java:203)
java.util.concurrent.TimeoutException
  java.base@17.0.6/java.util.concurrent.CompletableFuture.timedGet(CompletableFuture.java:1960)
  java.base@17.0.6/java.util.concurrent.CompletableFuture.get(CompletableFuture.java:2095)
  bloop.rifle.BloopServer$.buildServer(BloopServer.scala:220)
  scala.build.compiler.BloopCompilerMaker.$anonfun$1(BloopCompilerMaker.scala:48)
  scala.build.compiler.BloopCompiler.<init>(BloopCompiler.scala:15)
  scala.build.compiler.BloopCompilerMaker.$anonfun$2(BloopCompilerMaker.scala:51)
  scala.util.Try$.apply(Try.scala:217)
  scala.build.compiler.BloopCompilerMaker.create(BloopCompilerMaker.scala:51)
  scala.build.Build$.info$1$$anonfun$1(Build.scala:697)
  scala.build.EitherCps$Helper.apply(EitherCps.scala:19)
  scala.build.Build$.info$1(Build.scala:687)
  scala.build.Build$.run$1(Build.scala:715)
  scala.build.Build$.$anonfun$24(Build.scala:748)
  scala.build.Build$.$anonfun$adapted$1(Build.scala:748)
  scala.Function0.apply$mcV$sp(Function0.scala:42)
  scala.build.Build$Watcher.$init$$$anonfun$1(Build.scala:1274)
  java.base@17.0.6/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:539)
  java.base@17.0.6/java.util.concurrent.FutureTask.run(FutureTask.java:264)
  java.base@17.0.6/java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:304)
  java.base@17.0.6/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136)
  java.base@17.0.6/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)
  java.base@17.0.6/java.lang.Thread.run(Thread.java:833)
  com.oracle.svm.core.thread.PlatformThreads.threadStartRoutine(PlatformThreads.java:775)
  com.oracle.svm.core.posix.thread.PosixPlatformThreads.pthreadStartRoutine(PosixPlatformThreads.java:203)

cc @tgodzik

[tgodzik]

For sure we should not need to reconnect every time and looks like Bloop is no handling that very well. I am not sure however why is that happening, but we can add similar tests in the bloop repo to se if it reproduces.