Annotation @Autowired

Supposed that you have a Bean, you can use @Autowired to autowire the bean.

For example:

@Component
public class MyComponent {
	...
}

@Configuration
public class MyConfiguration {
	@Autowired 
	private MyComponent myComponent;
}

[!note]
Note that in here if you're using field auto-wired, the field cannot be final.

However, it's recommended to use Constructor injection:

@Configuration
public class MyConfiguration {
	private final MyComponent myComponent;

	public MyConfiguration(MyComponent myComponent) {
		this.myComponent = myComponent;
	}
}

If we have multiple constructor, we can then use @Autowired to specify which constructor we want Spring to use

@Configuration
public class MyConfiguration {
	private final MyComponent myComponent;
	private final MyService myService;

	@Autowired
	public MyConfiguration(MyComponent myComponent) {
		this.myComponent = myComponent;
	}

	public MyConfiguration(MyComponent myComponent, MyService myService) {
		this.myComponent = myComponent;
		this.myService = myService;
	}
}