JavaFX 11: How to Fix the \'IllegalAccessError\' When Creating a Label?

JavaFX 11: How to Address the IllegalAccessError When Creating a Label

JavaFX 11 has transitioned away from being part of the JDK, leaving developers to integrate it as a separate SDK. While this provides greater flexibility, it also introduces additional configuration requirements.

To overcome the IllegalAccessError that arises when attempting to add a label to a Scene, you must:

1. Add the JavaFX SDK: Ensure that the JavaFX SDK has been correctly installed and added as a library in your development environment (e.g., IntelliJ IDEA).

2. Set VM Options: Crucially, you should configure the Virtual Machine (VM) options for your project. This includes:

   • Adding Modules to the Module Path (-p): Specify the path to the JavaFX modules that are required for your application, in this case, the javafx.controls module. Use the -p option followed by the module path, e.g., -p /usr/lib/jvm/javafx-sdk-11.0.2/lib/javafx.controls.
   • Granting Permissions (add-reads): Allow the necessary modules to access each other. In this scenario, use --add-reads javafx.controls=ALL-UNNAMED, which grants the javafx.controls module access to other modules that have not explicitly granted it permission.
   • Granting Permissions (add-modules): Specify which modules to add to your project. Example: --add-modules javafx.base,javafx.graphics.

By following these steps, you can configure the JavaFX runtime environment appropriately and resolve the IllegalAccessError issue. Remember to refer to the official JavaFX documentation for the latest instructions and best practices.

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