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

Question

I get error when I run the main class.

Error:

Action: Consider defining a bean of type 'seconds47.service.TopicService' in your configuration.  Description: Field topicService in seconds47.restAPI.topics required a bean of type 'seconds47.service.TopicService' that could not be found 

TopicService interface:

public interface TopicService {      TopicBean findById(long id);      TopicBean findByName(String name);      void saveTopic(TopicBean topicBean);      void updateTopic(TopicBean topicBean);      void deleteTopicById(long id);      List<TopicBean> findAllTopics();       void deleteAllTopics();      public boolean isTopicExist(TopicBean topicBean); } 

controller:

@RestController public class topics {      @Autowired     private TopicService topicService;      @RequestMapping(path = "/new_topic2", method = RequestMethod.GET)     public void new_topic() throws Exception {         System.out.println("new topic JAVA2");     } } 

Implementation class:

public class TopicServiceImplementation implements TopicService {      @Autowired     private TopicService topicService;      @Autowired     private TopicRepository topicRepository;      @Override     public TopicBean findById(long id) {         throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.     }      @Override     public TopicBean findByName(String name) {         throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.     }      @Override     public void saveTopic(TopicBean topicBean) {         throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.     }      @Override     public void updateTopic(TopicBean topicBean) {         throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.     }      @Override     public void deleteTopicById(long id) {         throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.     }      @Override     public List<TopicBean> findAllTopics() {         throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.     }      @Override     public void deleteAllTopics() {         throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.     }      @Override     public boolean isTopicExist(TopicBean topicBean) {         throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.     } } 

Rest of the classes are defined too. I don't know why its throwing despite declaring componentScan in main class.

Main class:

@SpringBootApplication(exclude = {SecurityAutoConfiguration.class }) @ComponentScan(basePackages = {"seconds47"}) @EnableJpaRepositories("seconds47.repository") public class Application {      public static void main(String[] args) {         SpringApplication.run(Application.class, args);     } } 

I have my packages like this:

seconds47 seconds47.beans seconds47.config seconds47.repository seconds47.restAPI seconds47.service 

Answer 1

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.

Answer 2

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.