IntelliJ IDEA Ultimate 2018.3 thinks my Java 9 Project is a Kotlin Project

Question

I have an IntelliJ project composing several subprojects which are all Java 9 modules. I use Maven as a build system. My project has no \"Facets\". My run configuration look

Answer 1

Update your module-info.java file

requires javafx.fxml;
requires javafx.controls;
requires javafx.graphics;
requires javafx.web;

opens sample;

opens sample.controller;

It opens the package (eg. sample) which contains your Launcher file and opens package conatinsyoyr controllers and its corresponding fxml files (eg. sample.controller)