microsoft / microsoft/vscode-java-debug

Randomly Failed to lanuch debuggee in terminal: com.sun.jdi.connect.TransportTimeoutException

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ai-triaged bug
Dominant language
TypeScript
Stars
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Forks
429
Avg merge
1d 9h
Merged PRs (30d)
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Description

Randomly getting error: Failed to lanuch debuggee in terminal: com.sun.jdi.connect.TransportTimeoutException

Environment
  • Operating System: Debian GNU/Linux 12 x86_64
  • JDK version: openjdk 17.0.7
  • Visual Studio Code version: 1.79.2 (vscodium)
  • Java extension version: v0.25.2023042006
  • Java Debugger extension version: v0.51.0
Steps To Reproduce

It occurs completely randomly, and can be for any java code.

I managed to reproduce it:

  1. Create a simple Test.java.
sample project 
package com;

import java.util.Scanner;

public class Test {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int i = scanner.nextInt();
    }
}
  1. Start the program, enter 1 in the terminal, press Enter.
  2. Repeat step 2 until error occurs. (10 ~ 30 repeats)
  3. After randomly repeating, from now on the program freezes every time, and after 20 seconds later a message always pops up, saying Failed to lanuch debuggee in terminal. Reason: com.sun.jdi.connect.TransportTimeoutException
screenshot

2023-06-22_11-55

launch.json 
{
    "version": "0.2.0",
    "configurations": [
        {
            "type": "java",
            "name": "Test",
            "request": "launch",
            "mainClass": "com.Test",
            "projectName": "temp_43be885e"
        },
        {
            "type": "java",
            "name": "Current File",
            "request": "launch",
            "mainClass": "${file}"
        },
        {
            "type": "java",
            "name": "App",
            "request": "launch",
            "mainClass": "App",
            "projectName": "temp_43be885e"
        },
        {
            "type": "java",
            "name": "Main",
            "request": "launch",
            "mainClass": "com.Main",
            "projectName": "temp_43be885e"
        }
    ]
}

It doesn't happens a lot when I try to reproduce it.

Java Language Server Log 
!ENTRY java-debug 4 0 2023-06-22 18:15:38.087
!MESSAGE [error response][launch]: Failed to launch debuggee in terminal. Reason: com.sun.jdi.connect.TransportTimeoutException
!STACK 0
com.microsoft.java.debug.core.DebugException: Failed to launch debuggee in terminal. Reason: com.sun.jdi.connect.TransportTimeoutException
	at com.microsoft.java.debug.core.adapter.handler.LaunchWithDebuggingDelegate.lambda$launchInTerminal$0(LaunchWithDebuggingDelegate.java:147)
	at java.base/java.util.concurrent.CompletableFuture.uniWhenComplete(Unknown Source)
	at java.base/java.util.concurrent.CompletableFuture$UniWhenComplete.tryFire(Unknown Source)
	at java.base/java.util.concurrent.CompletableFuture.postComplete(Unknown Source)
	at java.base/java.util.concurrent.CompletableFuture.complete(Unknown Source)
	at com.microsoft.java.debug.core.protocol.AbstractProtocolServer.lambda$sendRequest$2(AbstractProtocolServer.java:178)
	at io.reactivex.internal.observers.LambdaObserver.onNext(LambdaObserver.java:63)
	at io.reactivex.internal.operators.observable.ObservableObserveOn$ObserveOnObserver.drainNormal(ObservableObserveOn.java:201)
	at io.reactivex.internal.operators.observable.ObservableObserveOn$ObserveOnObserver.run(ObservableObserveOn.java:255)
	at io.reactivex.internal.schedulers.ScheduledRunnable.run(ScheduledRunnable.java:66)
	at io.reactivex.internal.schedulers.ScheduledRunnable.call(ScheduledRunnable.java:57)
	at java.base/java.util.concurrent.FutureTask.run(Unknown Source)
	at java.base/java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(Unknown Source)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
	at java.base/java.lang.Thread.run(Unknown Source)
Additional Informations
  • It occurs completely randomly, and can be for any java code.
  • Cleaning java workspace could temporarily fix.
  • Downgrading the extension to 0.50.0 doesn't fix it. It didn't occur to me in the few months ago.
  • Downgrading the extension to 0.49.0 and 0.46.0, doesn't seem to be able to reproduce (but it's hard to tell because it is random).
  • Adding "java.debug.settings.console":"internalConcole" in User/settings.json seems to fix it, but I cannot use the terminal to enter inputs now. reference
### Tasks

Contributor guide

Open the contributing guide

First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start with LaunchWithDebuggingDelegate.java at line 147, where the stack trace reports the terminal launch failure. Reproduce with the shown Test.java program by repeatedly entering 1, and compare behavior with the terminal console setting enabled or disabled. Done means repeated launches no longer freeze or end in TransportTimeoutException.

Written by the indexing model from the issue text.

Assessment

Tech stack
java, typescript, vscode
Domain
devtools
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Needs clarification
Newbie friendliness
35/100

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