Error: "Failed to evaluate. Reason: Cannot evaluate because the thread is resumed"

[shiuchunming]

Get error message "Failed to evaluate. Reason: Cannot evaluate because the thread is resumed" after getting input from vscode debug console using BufferedReader in Java.

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class demo {
    public static void main(String args[]) throws IOException {
        int input;
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        try {
           input = br.read();
        }
        catch(IOException e) {
            e.printStackTrace();
        }
        if(br != null) br.close();
        System.out.println("123"); // would not execute using debug console in vscode.
    }
}

Here is the launch.json, which is basically a default one.

{
// Use IntelliSense to learn about possible attributes.
// Hover to view descriptions of existing attributes.
// For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
"version": "0.2.0",
"configurations": [
    {
        "type": "java",
        "name": "compile",
        "mainClass": "demo",
        "request": "launch",
        "args": ""
    }

]
}

---

Environment

• Operating System: Elementary OS 0.4.1 Loki Built on "Ubuntu 16.04.3 LTS"
• JDK version: java 9.0.1
• Visual Studio Code version: 1.18.0
• Java extension version: 0.14.0

Steps To Reproduce

1. A console Java program getting user input with BufferedReader.
2. start debugging on debug console

Current Result

Expected Result

Additional Informations

[andxu]

Hi shiuchunming, for the evaluation feature, it is required to be performed against a stopped(caused by pause) thread, if you continue the breakpoint, the evaluation functionality will be disabled, and your express will show " Cannot evaluate because the thread is resumed", if you are stopped at certain line of the code, it should be a bug when you cannot evaluate, so please tell me whether your code is stopped or not when the evaluation work cannot be continued.

[andxu]

It is by design that eval work can be only done at a the suspend JVM thread(caused by breakpoint/step)

[andxu]

#161