Answer by rascio for SpringBoot application doesn't autowire field

Spring is not so smart :)

You should annotate your bean like:

@RequiredArgsConstructor
public class ServiceAImpl {
     @Value("${fieldA}")
     private final String something;
...

But I'm not sure it will work with the @RequiredFieldsConstructor, it would be simpler for you write down the constructor annotated with @Autowired and using the @Value annotation for the String parameter:

@Autowired
public ServiceAImpl(@Value("${aProp}") String string) {