Context initialization failed

Context initialization failed
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'userController': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: private edu.scramjet.service.AppUserService edu.scramjet.controller.UserController.appUserService; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [edu.scramjet.service.AppUserService] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}

Solution :
If you look at stack. Spring container is unable to create bean. for userController. unable to autowire the appUserService.

ex :  public class void UserController {
 
       @Autowired
private AppUserService appUserService;     ///  interface object

      @RequestMapping(value="/create",method=RequestMethod.POST,
produces=MediaType.APPLICATION_JSON_VALUE,
consumes=MediaType.APPLICATION_JSON_VALUE)
public User createAppUser(@RequestBody User user ){
System.out.println(user);

appUserService.createUser();



return user;
}

   
     }

If AppUserService  is object  interface and its autowired. We need to provide Implementation class for bean creation.


public interface AppUserService {

public void createUser();
}

@Service
public interface AppUserService implements  AppUserServiceImpl {

public void createUser() {

}

}