Running a modular Java application built by Gradle from IntelliJ IDEA

Question

How to run a Java class with a main method from Idea in project managed by Gradle in a modular way?

For class like

package org.example.moduledemo;

public class Main {
    public static void main(String[] args) {
        System.out.printf("Main module %s%n", System.getProperty("jdk.module.main"));
        System.out.printf("Main module class %s%n", System.getProperty("jdk.module.main.class"));
        System.out.printf("Module name %s%n", Main.class.getModule().getName());
    }
}

when run in modular way using java --module-path '.\build\classes\java\main' --module org.example.moduledemo/org.example.moduledemo.Main, it prints

Main module org.example.moduledemo
Main module class org.example.moduledemo.Main
Module name org.example.moduledemo

However when a "Run 'Main.main()'" is selected from Idea editor context menu

,

it creates a Run configuration with class-path

.

Even when the "Use classpath of module" option is unchecked, and the configuration looks like

,

it still invokes the app using command-line

"C:\Program Files\Java\jdk-23\bin\java.exe" -Dfile.encoding=UTF-8 -Duser.country=US -Duser.language=en -Duser.variant -cp C:\moduledemo-gradle\build\classes\java\main;C:\moduledemo-gradle\build\resources\main org.example.moduledemo.Main

and the application output shows that it's not run in modular way:

Main module null
Main module class null
Module name null

Project layout

Invoking context menu "Run ...main()" action starts the application in modular way when the project is built by Idea itself (i.e. not managed by Gradle).

I'd like to keep using the Idea "Run ...main()" action for it's simplicity. I'm aware of workarounds like Gradle application plugin or Gradle exec task.