How to Fix the \'Unsupported JavaFX Configuration\' Warning in Java 9 and Beyond?

JavaFX Warning: "Unsupported JavaFX Configuration"

When using JavaFX, you might encounter the warning: "Unsupported JavaFX configuration: classes were loaded from 'unnamed module @...'". This warning arises due to changes introduced in Java 9's Java Platform Module System (JPMS).

Solution:

To address this issue, ensure that JavaFX is loaded as named modules, meaning it's included in the module-path. Here are several approaches:

1. Non-Modular Applications:

Use the --add-modules argument:

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

2. Modular Applications:

Launch your application with the --module argument:

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

3. Use a JDK Distribution that Includes JavaFX:

Install a JDK distribution that includes JavaFX, such as BellSoft Liberica JDK or Azul Zulu JDK.

4. Ignore the Warning (not recommended):

The warning does not currently cause any functionality issues with JavaFX. However, it's advisable to resolve it for proper module support in the future.

Deployment Options:

• Require JavaFX JRE: Ensure clients have a JRE installed that includes JavaFX.
• Self-Contained Application: Distribute an executable that includes your code, libraries, and the JRE.
• Executable JAR File: Embed JavaFX in an executable JAR file. Note that this approach is unsupported for multiple modules in a single JAR.

Main Class Note:

When JavaFX is loaded from the unnamed module, the main class should not extend javafx.application.Application. Instead, define a main class that launches the JavaFX application.

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