Java Error: Could not find or load main class Test

Question

Searched and can't find a reason why this doesn't work. I get this error when trying to run a simple program:

public class Test {
    public static void main( String[] args) {
        System.out.println("Hello");
    }
}

I have used the gear to automatically generate the launch.json file. I have also never really done anything before. I'm using VSCode with the redhat java and java debugger extensions. I have java 1.8.0 installed (+jdk)

launch.json code:

{
"version": "0.2.0",
"configurations": [
    {
        "type": "java",
        "name": "Debug (Launch)-Test",
        "request": "launch",
        "cwd": "${workspaceFolder}",
        "stopOnEntry": false,
        "mainClass": "Test",
        "args": ""
    },
    {
        "type": "java",
        "name": "Debug (Attach)",
        "request": "attach",
        "hostName": "localhost",
        "port": 0
    }
]
}

Solution 1

I installed java 9 and openjdk 9.0.1 and it now works. No idea why Java 8u151 didn't work, but this does now.

Solution 2

Deleting .vscode/launch.json worked for me.

https://github.com/Microsoft/vscode-java-debug/blob/master/Troubleshooting.md#reason-7