Java: Unable to locate the resource file with locales

The following code

package com.my.exercise;
import java.util.Locale;
import java.util.ResourceBundle;
public class Main {
    public static void main(String[] args) {
        String language = "en";
        String country = "US";
        Locale l = new Locale(language, country);
        ResourceBundle r = ResourceBundle.getBundle("Bundle", l);
        String str = r.getString("wish"); // Prints "Happy Birthday"
        System.out.println(str);
    }
}

works for my sample application with the following folder structure when Resource Bundle 'Bundle' is located in src folder:

But the same code fails with error "Exception in thread "main" java.util.MissingResourceException: Can't find bundle for base name Bundle, locale en_US" when Resource Bundle 'Bundle' is placed inside src/main folder:

Problem: What do I need to modify in my code in order to make Resource Bundle 'Bundle' inside src/main folder to be discoverable?

Thank you very much for your advise, VGR! Indeed, there was a Maven project in the back-end. I submitted the code despite it was unable to find the resource files in my local Idea project, but it did pass the compilation on the server. I just ensured that I used the Resource Bundle location within src/main folder.