Java 9 no class definition exception

So i want to try the http client

package com.company;

import jdk.incubator.http.HttpClient;

public class Main {

public static void main(String[] args) {
    HttpClient client =  HttpClient.newHttpClient();

  }
}

And my module info looks like this

module com.company {
    requires jdk.incubator.httpclient;
}

But i get java.lang.NoClassDefFoundError: jdk/incubator/http/HttpClient

And I don't really understand why. My java version is "build 9-ea+ 169" and I use the latest version of IntelliJ idea (2017.1.3). I looked into this answer and it looks like I have to just add requirement into a file, but it doesn't work for some reason.

Java 9 no class definition exception

3 Answers