Installing Java and JavaFX

Install Java 21 JDK

Download Windows/x64 .msi build from here (be sure to click on the Java 21 tab to ensure you are getting the correct version)
Open the .msi file to install JDK21

Figure 1: Java Download)

Install JavaFX 21

Download x64 JavaFX 21 Windows SDK from here and unzip the file
- Select Windows for the Operating System
- Select x64 for the Architecture
- Select SDK for the Type
Copy the javafx-sdk-21.0.2¹ folder from the .zip file to C:\Program Files\Java\

Figure 2: JavaFX Download)

Install Scene Builder 21.0.0

Download Scene Builder Windows Installer from here
Open the .msi file to install Scene Builder

Configure IntelliJ

Set the Project SDK

Go to File -> New Projects Setup -> Structure
Select Project under Project Settings on the left side
Set SDK to 21 (if available); otherwise:
- Click Add SDK
- Select JDK and browse to C:\Program Files\Java\jdk-21²
Under Project language level select SDK default
Click OK

Add JavaFX to Global Library

Go to File -> New Projects Setup -> Structure
Select Global Libraries under Platform Settings on the left side
Click the + (plus symbol) in the upper left of the second column
Select Java from the menu
Browse to C:\Program Files\Java\javafx-sdk-21.0.2\lib (adjust to match version)
Change Name from lib to javafx
Click OK twice

Set Run Configuration Template for Application

Go to File -> New Projects Setup -> Run Configuration Templates...
Select Application
Click Modify options (or type Alt+M) and ensure Add VM options is checked
Paste the following in VM options:

--module-path "C:\Program Files\Java\javafx-sdk-21.0.2\lib" --add-modules=javafx.controls,javafx.fxml

Here too, ensure that the version number matches what you downloaded
Click OK

New IntelliJ Project

All of the steps above must be implemented once, but you'll need to do the following for each new IntelliJ project.

Create a Java (not JavaFX) project, if you create a JavaFX project, you will need to set the run configuration (as described above).

Add the JavaFX SDK library

Go to File -> Project Structure... (CTRL+ALT+SHIFT+S)
Select Modules
Open the Dependencies tab and click +
Select Library...
Within your JavaFX installation, select the javafx folder.
Click Add Selected and then OK

You may need to update the version number on the javafx-sdk in a similar way to a JDK version change.

If the version of the JDK is different, you will need to use the new version number in the rest of the instructions. E.g., if the version of JDK is 21.0.2, you should replace jdk-21 with jdk-21.0.2.