How to solve “javafx runtime components are missing” error

what is “javafx runtime components are missing”?

The "JavaFX runtime components are missing" error occurs when the necessary JavaFX libraries and resources are not available or properly configured to run the JavaFX application.

Solution for "JavaFX runtime components are missing" error:

To resolve this error, you can follow these steps:

1.    Ensure JavaFX is included in the project dependencies:

If you are using a build tool like Maven or Gradle, make sure you have added the JavaFX dependencies in your project configuration file (e.g., pom.xml for Maven or build.gradle for Gradle). Here is an example for Maven:

<dependencies>

    <dependency>

        <groupId>org.openjfx</groupId>

        <artifactId>javafx-controls</artifactId>

        <version>{javafx-version}</version>

    </dependency>

    <!-- Add other JavaFX dependencies as needed -->

</dependencies>

Replace {javafx-version} with the appropriate version of JavaFX.


2.    Set the JavaFX runtime path:

When running the JavaFX application from the command line, you need to include the --module-path and --add-modules options to specify the path to JavaFX modules and the modules to be used. Here is an example:

java --module-path /path/to/javafx-sdk/lib --add-modules javafx.controls,javafx.fxml MainClass                                                 

 

Replace ‘/path/to/javafx-sdk’ with the actual path to the JavaFX SDK.

If you are using an IDE like Eclipse or IntelliJ IDEA, you need to configure the JavaFX runtime path in the project settings. Refer to your IDE's documentation on how to set up JavaFX runtime.

3.    Verify JavaFX installation:

Make sure you have installed the JavaFX SDK on your system. You can download it from the official Oracle website or use a package manager if available for your operating system.

JavaFX is not included by default in the Java Development Kit (JDK) starting from JDK 11. You can download the JavaFX SDK separately from the official OpenJFX website and install it on your machine.

4.    Verify JavaFX version:

Ensure that the version of JavaFX you have installed matches the version expected by your application. If you are using a pre-built JavaFX application, make sure it is compatible with the installed JavaFX version. 

5.  IDE configuration:

If you are using an Integrated Development Environment (IDE) such as Eclipse or IntelliJ IDEA, make sure to configure the IDE to use the JavaFX runtime. Set the module path and add the required modules in the project settings or run configurations.

Example:

Here's an example of running a JavaFX application from the command line:

·       Assuming the JavaFX SDK is installed in /path/to/javafx-sdk, compile the JavaFX application using the following command:

javac --module-path /path/to/javafx-sdk/lib --add-modules javafx.controls,javafx.fxml MainClass.java


·       Once the compilation is successful, run the application with the following command:

java --module-path /path/to/javafx-sdk/lib --add-modules javafx.controls,javafx.fxml MainClass


Example:

Here's an example of a JavaFX application that includes the necessary dependencies and sets the JavaFX runtime path:

import javafx.application.Application;

import javafx.scene.Scene;

import javafx.scene.control.Button;

import javafx.stage.Stage;

 

public class MainClass extends Application {

    public static void main(String[] args) {

        launch(args);

    }


    @Override

    public void start(Stage primaryStage) {

        Button button = new Button("Click Me!");

        Scene scene = new Scene(button, 200, 200);

        primaryStage.setScene(scene);

        primaryStage.show();

    }

}

Ensure that you have followed the steps above to include JavaFX dependencies and properly set up the JavaFX runtime in your project.