Sbt --client "java.io.IOException: Stream Closed" exception for Play app

[dkovalenko]

steps

1. Take play framework project
2. Have sbt server running
3. Try to "run" in --client mode

problem

sbt --client app/run                                          
[info] entering *experimental* thin client - BEEP WHIRR
[info] terminate the server with `shutdown`
> app/run
[warn] javaOptions will be ignored, fork is set to false

--- (Running the application, auto-reloading is enabled) ---
[info] p.c.s.NettyServer - Listening for HTTP on /0:0:0:0:0:0:0:0:9000

(Server started, use Enter to stop and go back to the console...)
[error] java.io.IOException: Stream Closed
[error]         at java.base/java.io.FileInputStream.available0(Native Method)
[error]         at java.base/java.io.FileInputStream.available(FileInputStream.java:330)
[error]         at play.sbt.PlayConsoleInteractionMode$InputStreamWrapper.read(PlayInteractionMode.scala:64)
[error]         at jline.internal.NonBlockingInputStream.read(NonBlockingInputStream.java:245)
[error]         at jline.internal.InputStreamReader.read(InputStreamReader.java:258)
[error]         at jline.internal.InputStreamReader.read(InputStreamReader.java:195)
[error]         at jline.console.ConsoleReader.readCharacter(ConsoleReader.java:2180)
[error]         at jline.console.ConsoleReader.readCharacter(ConsoleReader.java:2170)
[error]         at play.sbt.PlayConsoleInteractionMode$.waitEOF$1(PlayInteractionMode.scala:99)
[error]         at play.sbt.PlayConsoleInteractionMode$.$anonfun$waitForKey$2(PlayInteractionMode.scala:110)
[error]         at play.sbt.PlayConsoleInteractionMode$.$anonfun$doWithoutEcho$1(PlayInteractionMode.scala:117)
[error]         at play.sbt.PlayConsoleInteractionMode$.$anonfun$doWithoutEcho$1$adapted(PlayInteractionMode.scala:114)
[error]         at play.sbt.PlayConsoleInteractionMode$.withConsoleReader(PlayInteractionMode.scala:93)
[error]         at play.sbt.PlayConsoleInteractionMode$.doWithoutEcho(PlayInteractionMode.scala:114)
[error]         at play.sbt.PlayConsoleInteractionMode$.$anonfun$waitForKey$1(PlayInteractionMode.scala:110)
[error]         at play.sbt.PlayConsoleInteractionMode$.$anonfun$waitForKey$1$adapted(PlayInteractionMode.scala:97)
[error]         at play.sbt.PlayConsoleInteractionMode$.withConsoleReader(PlayInteractionMode.scala:93)
[error]         at play.sbt.PlayConsoleInteractionMode$.waitForKey(PlayInteractionMode.scala:97)
[error]         at play.sbt.PlayConsoleInteractionMode$.waitForCancel(PlayInteractionMode.scala:121)
[error]         at play.sbt.run.PlayRun$.$anonfun$playRunTask$3(PlayRun.scala:121)
[error]         at play.sbt.run.PlayRun$.$anonfun$playRunTask$3$adapted(PlayRun.scala:67)
[error]         at scala.Function1.$anonfun$compose$1(Function1.scala:49)
[error] stack trace is suppressed; run last app / Compile / run for the full output
[error] (app / Compile / run) java.io.IOException: Stream Closed
[error] Total time: 4 s, completed 18 May 2021, 12:29:13

After this sbt server continues to run play application, but I can't see any output from it and can't stop it other than killing parent sbt process.

expectation

Play server is running properly in sbt --client mode, I can see the output of the server in my console, I can stop the application with Ctrl+C.

notes

Sbt version: 1.5.2
Play framework version: 2.7.9

[eed3si9n]

@dkovalenko Thanks for the report. Could you tell us which version of sbt and Play you're using?

If I remember correctly, there was an issue in sbt's input handling as well because JLine does its own input reading instead of the assigned System.in so we forked JLine 2 to respect it - sbt/jline2#1. Not sure if it's the same issue, but could be related.

[eatkins]

Yeah, play is using a FileInputStream for some reason. That will definitely not work with client mode: https://github.com/playframework/playframework/blob/53e55f017f508f0dcdf2a70327bd73153fe87e5e/dev-mode/sbt-plugin/src/main/scala/play/sbt/PlayInteractionMode.scala#L84-L87. This should probably be a play issue. They shouldn't need to create a non blocking input stream reader because sbt makes System.in non-blocking starting with 1.4.0.

[dkovalenko]

@dkovalenko Thanks for the report. Could you tell us which version of sbt and Play you're using?

If I remember correctly, there was an issue in sbt's input handling as well because JLine does its own input reading instead of the assigned System.in so we forked JLine 2 to respect it - sbt/jline2#1. Not sure if it's the same issue, but could be related.

Sbt version: 1.5.2
Play framework version: 2.7.9

[dkovalenko]

Yeah, play is using a FileInputStream for some reason. That will definitely not work with client mode: https://github.com/playframework/playframework/blob/53e55f017f508f0dcdf2a70327bd73153fe87e5e/dev-mode/sbt-plugin/src/main/scala/play/sbt/PlayInteractionMode.scala#L84-L87. This should probably be a play issue. They shouldn't need to create a non blocking input stream reader because sbt makes System.in non-blocking starting with 1.4.0.

Can we somehow create an issue for the play framework maintainers to fix that? I can do that but I lack some technical details and don't want to be a secondhand source.

[eed3si9n]

@dkovalenko here you go - playframework/playframework#10864

[mkurz]

@eed3si9n You can close this issue here, I am taking care of it in the Play repo: playframework/playframework#11061

[eed3si9n]

Sounds good