Spring: @Value with lombok in other class

Question

Can we use @Value with lombok?

I created a class below

@Getter
@Setter
class Hello
{

    @Value("${url}")
    private String url;

}

Is it possible to reuse the String url value in other class,Using lombok getters and setters?

Answer 1

Of course. Lombok creates the getters and setters, public by default, and therefore they are accessible by any other class using the conventional getter/setter syntax. In this case, you'd just need to invoke the function:

yourHelloObject.getUrl()

Answer 2

Yes, but it still needs to adhere to the rules of autowiring. You need to give Spring's dependency injection framework a chance to get involved.

If you just write

Hello hello = new Hello()
System.out.println(hello.getUrl()); // null

then the result will be null.

Because objects may be left in a half-initialized state, field injection is usually not a good idea.

This is nothing to do with Lombok. The object needs to be created by Spring. One way to do that is to make it a component

@Component
@Getter
@Setter
class Hello
{
    @Value("${url}")
    private String url;
}

...

@Component
public class AnotherComponent {
    public AnotherComponent(Hello hello) { //constructor injection
        System.out.println(hello.getUrl()); //not null
    }
}