How Can I Launch Multiple Standalone JavaFX Applications from the Same Package?

Starting Standalone Applications Within a Package

Background:

You have multiple standalone applications (myClass1, myClass2, etc.) within the same Java package and wish to launch them independently from each other. However, simply calling another application's launch() method results in an error due to repeated application launches being prohibited.

Solution:

While it is possible to use a direct call to start(...) on a new instance of an Application subclass, it is discouraged for several reasons:

• It goes against the intended purpose of the start(...) method, which is to replace the main method in traditional Java applications.
• Each Application subclass represents an entire running application, making multiple instances inherently non-reusable.

Re-Architecting Your Design:

To resolve this issue, consider restructuring your design so that the application modules are not Application subclasses but regular classes. This allows you to create separate standalone applications for each module or instantiate them as part of a larger application.

Standalone Application Example:

public class FirstApplication extends Application {

    @Override
    public void start(Stage primaryStage) {
        Scene scene = new Scene(new FirstModule().getView());
        primaryStage.setScene(scene);
        primaryStage.show();
    }
}

Composite Module Example:

public class CompositeModule {
    // ...

    public void showFirstModule() {
        Scene scene = new Scene(new FirstModule().getView());
        Stage stage = new Stage();
        stage.initOwner(this.getClass());  // Must use a JavaFX class, not an Application class
        stage.setScene(scene);
        stage.show();
    }

    // ...
}

By following this approach, you can create and launch multiple standalone applications within the same package, while adhering to JavaFX best practices.

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