如何自动连接@service类？ 找不到依赖类型的合格Bean

Question

What are the prerequisites to auto-wired any class without implementing any interface?

Class Diagrams

1. MainClass -> Annotation used : @SpringBootApplication @EnableTransactionalManagement

2. DatabaseConfig -> @Configuration @EnableTransactionalManagement

3. UserRepository -> @Repository

4. UserService -> @Service and @Autowired UserRepository

When I am writing test class with @Autowired userRepository it is working, but when I use @Autowired UserService and trying to call userRepository methods.

I am getting this error:

Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: 
No qualifying bean of type [sm.services.AgendaService] found for dependency:
expected at least 1 bean which qualifies as autowire candidate for this dependency. 
Dependency annotations: {@javax.inject.Inject()}

Project Structure

Answer 1

I was implementing an extra interface in "public class UserService implements SomeClass ", when i switch to interface to abstract class SomeClass its start working.

public class UserService extends SomeClass