[FIXED] Spring Boot bean creation/injection issue

Issue

I have spring boot application where I am stuck not sure what's wrong in my code. It gives me error of beans creation. I have used @Autowired, but not sure what's wrong.

Main.Java

@SpringBootApplication
public class Application
{
    public static void main(String[] args)
    {
        SpringApplication.run(Application.class, args);
    }
}

UserWS.java

@Controller
public class UserWS
{

    @Autowired
    UserService userService;

    @RequestMapping(value = URLConstants.ADD, method = RequestMethod.POST)
    @ResponseBody
    public ResponseEntity<Status> add(@RequestBody User user) throws PeerRateException
    {
        try
        {
            userService.addUser(user);
            Status status = PeerUtils.getSuccessStatus();
            status.setObject(null);
            return new ResponseEntity<>(status, HttpStatus.OK);
        }
        catch (Throwable t)
        {
            throw new PeerRateException(ExceptionConstants.USER_CREATE_CODE, ExceptionConstants.USER_CREATE, t);
        }
    }
}

UserService.Java

@Component
public class UserService
{

    @Autowired
    private UserDao userDao;

    public void addUser(User user)
    {
        userDao.save(user);
    }

}

UserDao.java

@Transactional
public interface UserDao extends CrudRepository<User, Long>
{

}

EDIT

com.hk.peerrate.main
    Main.java
com.hk.peerrate.service
    UserService.java
com.hk.peerrate.ws
    UserWS.java

Solution

Since you haven't displayed the package where all above class resides, I can only assume that the problem is with your Project structure.

The UserService class could be outside of the @ComponentScan.

Now @SpringBootApplication is same as @Configuration @EnableAutoConfiguration @ComponentScan together, so make sure that the UserService.java is under the same package or sub-package of your Application.java.

Have a look at the this Spring Boot doc.

Answered By - Sanjay Rawat
Answer Checked By - David Goodson (JavaFixing Volunteer)