ServiceLoader can't find my implementation

Question

I'm trying to use ServiceLoader with modules system, the same way as shown in the Deploying service providers as modules header in the documentation here - click

I have the following project:

module tester.client

package tester.client;

import tester.common.Showable;

import java.util.ServiceLoader;

public class Main {

    public static void main(String[] args) {
        ServiceLoader<Showable> loader = ServiceLoader.load(Showable.class);
        loader.findFirst().orElseThrow(); //throws Exception
    }

}

module-info.java

import tester.common.Showable;

module tester.client {
    requires tester.common;
    uses Showable;
}

module tester.common

package tester.common;

public interface Showable {
    void show();
}

module-info.java

module tester.common {
    exports tester.common;
}

module tester.gui

package tester.gui;

import tester.common.Showable;

public class Window implements Showable {
    @Override
    public void show() {

    }
}

module-info.java

module tester.gui {
    requires tester.common;
    provides tester.common.Showable with tester.gui.Window;
}

THE PROBLEM:

ServiceLoader doesn't load my implementation.

• tester.client uses Showable
• tester.common exports Showable
• tester.gui provides Showable with Window

Answer 1

It turned out the problem is IDE-specific. As my IDE (Intellij IDEA) has its own additional modules system, I needed to add tester.gui module as a dependency of tester.client module.

Solution provided by @samabcde