... is no accessor method

Question

I'm currently learning the ropes of Spring.
I tried to autowire a method parameter like so:

@RequestMapping("/hello")
public String something(@Autowire AnInterface ai) {
    ai.doSomething();
    return "/";
}

With the following interfaces and classes:

@Component
public interface AnInterface {
    void doSomething();
}

@Component
public class Implementation implements AnInterface {
    @Autowired private AnotherInterface ai;

    public Implementation() { ; }

    public Implementation(AnotherInterface ai) {
        this.ai = ai;
    }

    public void setAi(AnotherInterface ai) {
        this.ai = ai;
    }

   @Override
   public void doSomething() {
       System.out.println(ai.hello());

   }
}

@Component
public interface AnotherInterface {
    String hello();
}

@Component
public class AnotherImplementation implements AnotherInterface {

    @Override
    public String hello() {
        return "hello";
    }

}

However, when calling the controller's method, I get an IllegalArgumentException:
Invoked method public abstract void AnInterface.doSomething() is no accessor method!

What am I doing wrong?

Thanks in advance :)

Answer 1

You cannot autowire component that way, try this:

@Autowire AnInterface ai;

@RequestMapping("/hello")
public String something() {
    ai.doSomething();
    return "/";
}