How Can I Start Multiple Standalone Java Applications Within the Same Package?

Starting Standalone Applications within the Same Package in Java

Starting standalone applications from within a parent application can be a common requirement in various scenarios. However, it poses a challenge when the standalone applications are all part of the same package.

The traditional approach of using myClass2.launch("") to launch myClass2 from myClass1 will result in an error, as launch is intended to be called once at the start of an application.

To overcome this issue, a more suitable approach is to refactor the design by creating separate classes for each module, rather than extending the Application class. These classes can be instantiated and managed as needed.

Refactoring the Application Design

Create regular classes, such as FirstModule and SecondModule, to encapsulate the functionality of each standalone application.

public class FirstModule {
    private BorderPane view;

    public FirstModule() {
        // Create and configure the view
    }

    public Parent getView() {
        return view;
    }
}

Instantiating and Managing Modules

Modules can be instantiated and managed directly within the main application.

FirstModule firstModule = new FirstModule();
Scene scene = new Scene(firstModule.getView());
Stage stage = new Stage();
stage.setScene(scene);
stage.show();

Creating Standalone Applications

For modules that need to run as standalone applications, separate Application subclasses can be created.

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

Integrating Modules into a Composite Application

Modules can also be integrated into a larger composite application.

public class CompositeModule {
    private HBox view;

    public CompositeModule() {
        // Create buttons to launch individual modules
    }

    public Parent getView() {
        return view;
    }
}

public class CompositeApplication extends Application {
    @Override
    public void start(Stage primaryStage) {
        Scene scene = new Scene(new CompositeModule().getView());
        primaryStage.setScene(scene);
        primaryStage.show();
    }
}

This approach allows you to have multiple standalone applications within the same package and seamlessly start them from within other modules or applications.

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