Why am I getting an IllegalAccessError when creating a Label in JavaFX 11?

JavaFX 11: IllegalAccessError when creating Label

JavaFX 11 introduced significant changes to the framework, separating it from the JDK. This change has led to a common issue where users encounter an IllegalAccessError when creating a Label or other control.

Cause of the Issue

The error is caused by a conflict between the JavaFX modules and the project's module path. JavaFX 11 uses a modular system, where libraries are packaged as modules that can be added to your project as needed. However, by default, IntelliJ IDEA does not correctly configure the module path for JavaFX.

Solution

To resolve this issue, you need to manually add the JavaFX modules to your project's module path and specify which modules you want to use.

1. Add JavaFX SDK as a Library:

   • In IntelliJ IDEA, right-click on your project in the Project Explorer and select "Add Framework Support."
   • Select "JavaFX" from the list and choose the appropriate version (11.0.2 in this case).

2. Configure VM Options:

   • Go to Run > Edit Configurations.

   • In the VM Options field, add the following:

3. Specify Module Dependency:

   • In the pom.xml file, add the following dependency:

     • <dependency>
           <groupId>org.openjfx</groupId>
           <artifactId>javafx-controls</artifactId>
           <version>11</version>

Additional Notes

• Replace "/path/to/javafx-sdk/lib" with the actual path to the JavaFX SDK library directory.
• If you need to use additional JavaFX modules, specify them in the --add-modules argument (e.g., --add-modules javafx.fxml).
• You can confirm that the correct modules are being used by adding the --list-modules flag to the VM Options.

By following these steps, you should be able to resolve the IllegalAccessError when creating a Label or other control in JavaFX 11.

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