Why Am I Getting an \"Unsupported JavaFX Configuration\" Warning Despite Compilation Success?

JavaFX Warning: Unsupported Configuration

When working with JavaFX, you may encounter a warning that reads "Unsupported JavaFX configuration: classes were loaded from 'unnamed module @...'" despite compilation success. This warning arises due to the module system introduced in Java 9 and affects how JavaFX is loaded.

Understanding the Issue

JavaFX only supports being loaded from named modules via the module-path, not the class-path. However, if the system detects that JavaFX was loaded from the class-path, it triggers this warning.

Solution

To resolve this issue, you need to ensure that JavaFX is loaded from the module-path as named modules. This can be done in several ways:

1. Non-Modular Application: Use the --module-path and --add-modules arguments:

   java --module-path <path-to-fx> --add-modules javafx.controls ...

2. Modular Application: Use the --module argument to launch your application as a module:

   java --module-path <path> --module app/com.example.app.Main [args...]

3. Use a JDK Distribution with JavaFX: Use Java versions that include JavaFX by default, such as BellSoft Liberica JDK or Azul Zulu JDK.
4. Ignore the Warning: You may choose to ignore the warning as it doesn't currently cause any functional issues. Note that this approach is not recommended.

Deployment

For deployment, you can consider the following options:

• Require JavaFX Installed JRE: Ensure clients have a compatible JRE with JavaFX installed.
• Self-Contained Application: Package your application with all necessary dependencies and a bundled JRE.
• Executable JAR: Embed JavaFX and other dependencies into an executable JAR file.

Additional Notes

• By default, JavaFX requires the main class to be a subtype of javafx.application.Application.
• If JavaFX is loaded from the unnamed module, the main class cannot be a subtype of javafx.application.Application.

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