open your intellij idea IDE and create new Project
Go to File > Project Structure
Go to Project Settings > Libraries
Click on + button
Locate ..\openjfx-11.0.1_windows-x64_bin-sdk\javafx-sdk-11.0.1\lib folder from extracted zip of openJFX 11
Apply settings and click ok
Go to File > Settings
In Settings go to Appearance & Behavior > System Settings > Path Variables
Click on + and add new path variable name it PATH_TO_FX and in value field locate ..\openjfx-11.0.1_windows-x64_bin-sdk\javafx-sdk-11.0.1\lib folder
Apply settings and click ok
The go to Run > Edit Configurations
Select your Application from Application > {your application name}
Then click on Configuration tab and in VM options field write this:
--module-path ${PATH_TO_FX} --add-modules=javafx.controls,javafx.fxml
Then Click on
Edit templates button select Application in Templates and again in VM options field write this:
--module-path ${PATH_TO_FX} --add-modules=javafx.controls,javafx.fxml
Apply settings and click ok and now you are good to go
You have to do this whenever you create new project in intellij
