Java project not found

[jav-ed]

It is a gradle project and gradle is able to execute (run, debug, build,..) it. IntelliJ IDEA is also able to get the code running. However, as soon as I come over to VSCode, it says

ConfigError:The porject 'First_Proj' is not a valid project

The link : https://github.com/Microsoft/vscode-java-debug/blob/main/Troubleshooting.md#failed-to-resolve-classpath did not help to resolve the issue

Environment

➜  bin lsb_release -a
LSB Version:	core-2.0-noarch:core-3.2-noarch:core-4.0-noarch:core-2.0-x86_64:core-3.2-x86_64:core-4.0-x86_64:desktop-4.0.fake-amd64:desktop-4.0.fake-noarch:graphics-2.0-amd64:graphics-2.0-noarch:graphics-3.2-amd64:graphics-3.2-noarch:graphics-4.0.fake-amd64:graphics-4.0.fake-noarch
Distributor ID:	openSUSE
Description:	openSUSE Leap 15.5
Release:	15.5
Codename:	n/a
➜  bin java -version
openjdk version "17.0.3" 2022-04-19
OpenJDK Runtime Environment Temurin-17.0.3+7 (build 17.0.3+7)
OpenJDK 64-Bit Server VM Temurin-17.0.3+7 (build 17.0.3+7, mixed mode, sharing)

• VSCode
  Version: 1.85.2
  Commit: 8b3775030ed1a69b13e4f4c628c612102e30a681
  Date: 2024-01-18T06:40:19.222Z
  Electron: 25.9.7
  ElectronBuildId: 26354273
  Chromium: 114.0.5735.289
  Node.js: 18.15.0
  V8: 11.4.183.29-electron.0
  OS: Linux x64 5.14.21-150500.55.39-default

• Java extension version: Language Support for Java(TM) by Red Hat
  v1.26.0

• Java Debugger extension version: v0.55.0

Steps To Reproduce

Unfortunately, I am working on a project, that I cannot share. However, maybe you have some ideas, you want me to check and I inshallah can give you my outcome

Current Result

Project is not detected as valid project --> code does not run at all using the vscode debugger

Expected Result

The code should be executable

Additional Informations

content of: settings.gradle:
rootProject.name = 'First_Proj'

content of : launch.json

{
    "version": "0.2.0",
    "configurations": [
        {
            "type": "java",
            "name": "Launch Current File",
            "request": "launch",
            "mainClass": "${file}"
        },
        
        {
            "type": "java",
            "name": "Main",
            "request": "launch",
            "mainClass": "Main",
            "projectName": "First_Proj"
        }
    ]
}

[testforstephen]

What project name do you see in Java Projects view?

[jav-ed]

now adapting the project name, the project is found and the initial issue is resolved (great):

        {
            "type": "java",
            "name": "Main",
            "request": "launch",
            "mainClass": "Main",
            "projectName": "1_Tank_Modeler"
        }

While the project is found and it can be run with the debugger, there is still another issue that does not occur with IntelliJ:

Working Directory = /masked/1_Tank_Modeler
Exception in thread "main" java.lang.NullPointerException
        at java.base/java.io.Reader.<init>(Reader.java:168)
        at java.base/java.io.InputStreamReader.<init>(InputStreamReader.java:76)
        at tubestruct.geometrylibrary.GeoDatReader.inputGeoDat(GeoDatReader.java:41)
        at tubestruct.geometrylibrary.GeoDatReader.<init>(GeoDatReader.java:21)
        at tubestruct.Tubestruct.<init>(Tubestruct.java:132)
        at Main.main(Main.java:58)

[jav-ed]

So, the problem is that a file is not found. The following code shows where I try to open the file.

    private double[][] inputGeoDat (String geoDatName) {
        double[][] geoDat = null;
        
        String fileName   = "data/" + geoDatName + ".dat";
        // String fileName   = "./tubestruct/geometrylibrary/data/fx73k170_WKW80_RadDat.dat";
        
        System.out.println("Working Directory = " + System.getProperty("user.dir"));
                
        ArrayList<double[]> data = new ArrayList<>();

        int nData = 0;

        BufferedReader reader = new BufferedReader(
            new InputStreamReader(this.getClass().getResourceAsStream(fileName)));

The following image shows that the file I am trying to access is found in the "JAVA PROJECTS" view