Consider defining a bean of type 'service' in your configuration [Spring boot]

A class must have the @Component annotation or a derivation of that (like @Service, @Repository etc.) to be recognized as a Spring bean by the component scanning. So if you add @Component to the class, it should solve your problem.

Since TopicService is a Service class, you should annotate it with @Service, so that Spring autowires this bean for you. Like so:

@Service
public class TopicServiceImplementation implements TopicService {
    ...
}

This will solve your problem.