launch.json

{
    // 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": "Launch CheckoutArchive",
            "request": "launch",
            "mainClass": "org.unicode.cldr.tool.CheckoutArchive",
            "projectName": "cldr-code",
            "vmArgs": [
                "-DCLDR_DIR=${workspaceFolder}"
            ]
        },
        {
            "type": "java",
            "name": "Launch Current File",
            "request": "launch",
            "mainClass": "${file}",
            "vmArgs": [
                "-DCLDR_DIR=${workspaceFolder}"
            ]
        },
        {
            "type": "java",
            "request": "attach",
            "name": "Attach cldr-apps by Process ID",
            "processId": "${command:PickJavaProcess}",
            "projectName": "cldr-apps"
        },
        {
            "type": "java",
            "request": "attach",
            "name": "Attach cldr-code by Process ID",
            "processId": "${command:PickJavaProcess}",
            "projectName": "cldr-code"
        }
    ]
}