How to inject objects which are not annotated Spring classes - spring

Question

Lets say I've got a JavaFx class and an ViewState class which needs to have referance of stage created in start method. How am I able to autowire such dependency? I know that Stage.class is not annotated as #Component so Spring is unable to detect duch #Bean.
#SpringBootApplication
#ComponentScan({"controller","service","dao","javafx.stage.Stage"})
#EntityScan( basePackages = {"Model"})
#Import({ SpringConfig.class})
public class JavaFXandSpringBootTestApplication extends Application{
private ApplicationContext ctx;
public static void main(String[] args) {
launch();
}
#Override
public void start(Stage stage) throws Exception {
ViewState viewState = ctx.getBean(ViewState.class);
}
ViewState class:
#Componenet
public class ViewState {
#Autowired
private ApplicationContext ctx;
private Stage stage;
#Autowired
public ViewState(Stage stage)
{
this.stage = stage;
}
}
Compiler massage:
Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'javafx.stage.Stage' available: expected at least 1

Answer 1

You probably don't want to do this at all: your ViewState class would seem to be a model class of some kind, so it should not have references to UI elements (such as Stages).
For completeness, though, here is an example that works, using ConfigurableApplicationContext.getBeanFactory().registerResolvableDependency(...). Note that, since you won't be able to create the View object until the stage is registered, you need to make the View bean #Lazy:
package example;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Lazy;
import org.springframework.stereotype.Component;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.layout.StackPane;
import javafx.stage.Stage;
#Component
#Lazy
public class View {
#Autowired
public View(Stage stage) {
Button close = new Button("Close");
close.setOnAction(e -> stage.hide());
StackPane root = new StackPane(close);
Scene scene = new Scene(root, 400, 400);
stage.setScene(scene);
stage.show();
}
}
package example;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.ConfigurableApplicationContext;
import javafx.application.Application;
import javafx.stage.Stage;
#SpringBootApplication
public class Main extends Application {
private ConfigurableApplicationContext ctx ;
#Override
public void start(Stage primaryStage) {
ctx = SpringApplication.run(Main.class);
ctx.getBeanFactory().registerResolvableDependency(Stage.class, primaryStage);
ctx.getBean(View.class);
}
#Override
public void stop() {
ctx.close();
}
public static void main(String[] args) {
launch(args);
}
}