Spring No qualifying bean of type 'Resource' available while building in Docker

Affects: Spring 5.3.2.RELEASE, Spring Boot 2.2.4.RELEASE

(I'm not sure if it's a Spring issue of Spring Boot issue.) I try to inject a resource from the classpath using the following syntax and everything works like a charm:

@Configuration
@RequiredArgsConstructor
public class MyConfiguration {
  @Value("classpath:${my-file}")
  private final Resource myFile;
  // a lot of codes here;
}

But when I try to build the project (and run tests) in Docker, it fails with:

No qualifying bean of type 'org.springframework.core.io.Resource' available: expected at least 1...

I managed to resolve it by removing final keyword from the field. But just wanted to know why it fails. Thanks.

Comment From: chenqimiao

I guess this is because the property cannot be set for the final field via reflection.

Comment From: akefirad

I'm not following. When it's final, it's constructor based injection, not field based. And as I said, with final, it works just fine on the host. It fails only in Docker.

Comment From: albertocavalcante

@akefirad Did you solve it?

Comment From: akefirad

Not really, I had to make the field non-final.

Comment From: amithkumarg

The reason you are getting this exception because in the lombok generated constructor, it didn't copy the @Value annotation. For that you have to add the configuration (below file) in the project root folder. For multi module project, add it in the parent directory.

~lombok.config

lombok.copyableAnnotations += org.springframework.beans.factory.annotation.Value
lombok.copyableAnnotations += org.springframework.beans.factory.annotation.Qualifier
lombok.copyableAnnotations += org.springframework.context.annotation.Lazy

Comment From: sbrannen

If you are still facing this issue, please provide a minimal sample application (preferably a GitHub project that we can clone or a ZIP file), so that we can observe the behavior.

Comment From: akefirad

It’s been almost 3 years ago, so I might be wrong. But I think we had the Lombok config you’re suggesting from the beginning in the project. I don’t have access to the project anymore. So feel free to close the issue.