Beginner Spring framework no qualifying bean exception

[worldly cradle]

I'm taking a Spring framework course and I'm having a lot of trouble with this as it seems to be correct from what the course is showing me. I keep getting a exception saying

Exception in thread "main" org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'com.in28minutes.spring.learnspringframework.GameRunner' available"

Main class

@SpringBootApplication
public class LearnSpringFrameworkApplication {

    public static void main(String[] args) {
        ConfigurableApplicationContext context;
        context = SpringApplication.run(LearnSpringFrameworkApplication.class, args);

        //MarioGame game = new MarioGame();
        //PacmanGame pac = new PacmanGame();

        //GameRunner runner2 = new GameRunner(game);
        GameRunner runner = context.getBean(GameRunner.class);
        runner.run();
    }
}

Game Runner class, the one that is considered "not a qualifying bean"

@Component
public class GameRunner {

    @Autowired
    private GamingConsole game;

    public GameRunner(GamingConsole game) {
        this.game = game;
    }

    public void run() {
        game.up();
        game.down();
        game.left();
        game.right();
    }
}

Gaming Console Interface

@Component
public interface GamingConsole {
    void up();
    void down();
    void left();
    void right();
}

[dapper thicket]

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[worldly cradle]

Beginner Spring framework no qualifying bean exception

[molten fulcrum]

An interface can't be a component. Beside the automatic data CRUD repositories, what would that even mean?

[worldly cradle]

I was mostly just trying things to see if they worked

doesn't work with or without the component on the interface anyway

The mariogame and pacman game classes commented out implement the game console interface

[molten fulcrum]

You do need an implementation that ca, be autowired

It's juste the interface itself isn't an implementation

You could make MarioGame a component, if it implements it

[worldly cradle]

here's the mariogame class

@Component
public class MarioGame implements GamingConsole {
    public void up() {
        System.out.println("up");
    }
    public void down() {
        System.out.println("down");
    }
    public void left() {
        System.out.println("left");
    }
    public void right() {
        System.out.println("right");
    }
}

I did give it a component annotation

[molten fulcrum]

okay, apparently the error is that it doesn't find GameRunner itself. Dang

Where are the classes?

[worldly cradle]

I did move them around trying to fix the exception, but originally the MarioGame, GameRunner, and GameConsole classes were in a package next to the main class

here's a screengrab

[molten fulcrum]

this shouldn't provoke that error. I wonder if you can actually use the context given by run() this way

[worldly cradle]

I thought maybe it was a problem with my configuration maybe but it was all set up using spring initializer

[worldly cradle]

do you mean that the context object is messed up somehow?

[molten fulcrum]

I mean you don't typically get a spring context object and demand beans out of it

So maybe the context given by run() isn't meant to be used that way

[worldly cradle]

That was what the guy in the course did at least
what would I do if I wanted to get the GameRunner bean then?

[molten fulcrum]

No idea, because you wouldn't want the GameRunner bean. You would want it to be used by your application as it runs

Think about when you make a REST server with Spring Boot, it's just made of controllers that respond to HTTP requests. The controllers autowire what they need and are run by Spring Boot itself. You never ask for the beans in any way

Usually that's how Spring Boot works

[worldly cradle]

Hmm

[molten fulcrum]

What does it do when you do something like that: https://www.baeldung.com/spring-boot-console-app ?

[worldly cradle]

it seems to work with no problem, log statements get output to console

[molten fulcrum]

Guess that context isn't meant to be used that way

[worldly cradle]

dang

I have no idea what this guy in the course is doing then

this is what he's getting

console statements from mario class

[molten fulcrum]

A very different version, maybe...

I guess I could try if I had the original material

[worldly cradle]

Thanks for the help

[dapper thicket]

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[worldly cradle]

hope you have a good one