CODEWITHSUNDEEP
javaspringspring-boot
ERR0
ERR0

Reputation: 57

Spring Boot defining bean in configuration problem

I'm working on a project on my sparetime, on this project I have been asked to work with Spring Boot. I'm not familiar with Spring Boot from before, and I have tried searching here on stackoverflow and Google, but I can't seem to understand how the different solutions for my problem works.

First of all, this is my error message:

Parameter 0 of constructor in com.project.example.controller.VerverController required a bean of type 'com.project.example.dao.VerverDao' that could not be found.

Action:

Consider defining a bean of type 'com.project.example.dao.VerverDao' in your configuration.

After some reading, I understood that this could be because of Spring Boot don't scan this class / interface. So I tried to add ComponentScan, with no luck.

I tried to convert VerverDao from interface to class and register a bean with bean annotation. Still no luck. I tried to move the VerverDao from the dao package to the root package (the same as the Main class) and still no luck.

So if someone could please help me understand the error message, it would make my day.

This is my structure:

project structure

This is my code:

Probably some of the annotation is wrong as well, since I'm not used to Spring Boot, in advance thanks for correcting me on the use of these It is also worth mentioning that I'm using Lombok as well on this project.

Main.java

@ComponentScan("com.gambinomafia")
@SpringBootApplication
public class Main extends SpringBootServletInitializer {
    public static void main(String[] args) {
        new Main().configure(new SpringApplicationBuilder(Main.class)).run(args);
        }
    }

Configuration.java

@Component
public class Configuration extends ResourceConfig {
    public Configuration() {
        register(VerverResourceImpl.class, VerverResource.class);
        register(VerverController.class);
        register(VerverDao.class);
    }
}

VerverResource.java

@Resource
@Path("verver")
public interface VerverResource {
    @GET
    @Path("/{userid}")
    @Produces(MediaType.APPLICATION_JSON)
    String getRefferingUrl(@PathParam("userid") int userid);
}

VerverResourceImpl.java

@AllArgsConstructor(onConstructor = @__({@Inject}))
public class VerverResourceImpl implements VerverResource {
    private VerverController controller;

    @Override
    public String getRefferingUrl(int userid) {
        log.info("Collection reciever url for user id: {}", userid);
        return controller.getRefferingUrl(userid);
    }
}

VerverController.java

@Controller
@AllArgsConstructor
public class VerverController {
    private VerverDao ververDao;

    public String getRefferingUrl(int userid) {
        User user = ververDao.getUsername(userid);

        if (user.getUsername().isEmpty()) {
            throw new NotFoundException("Did not find any user with id " + userid);
        }

        return "<url-to-site>/?verv=" + user.getUsername();
    }
}

VerverDao.java

@AllArgsConstructor
public class VerverDao {
    @Value("spring.datasource.url")
    private String dbcon;

    public User getUsername(int userid) {
        Jdbi jdbi = Jdbi.create(dbcon);

        return jdbi.withHandle(handle -> handle.createQuery(
                "SELECT id, brukernavn FROM t_user WHERE id = :id")
                .bind("id", userid)
                .mapToBean(User.class)
                .findOnly());
    }
}

Feel free to ask for more information, if there is missing some information in the topic. I will try to answer as fast as possible.

Upvotes: 1

Views: 1628

Answers (2)

Cata
Cata

Reputation: 585

First at all, you're setting a @ComponentScan with a wrong package in your Application class.

@ComponentScan("com.gambinomafia")
@SpringBootApplication

And, according to the picture, it has to be:

@ComponentScan("com.project.example")
@SpringBootApplication

EDIT: the use of @ComponentScan by @M.Deinum

Because of the Application Class is in the root package and @SpringBootApplication already contains @ComponentScan, It isn't needed to declare @ComponentScan.

Second, instead of use a DAO you can use Repositories. There is more information here: Spring Boot Repositories.

Third, to inject your objects you can use @Autowired over the constructor.

@Controller
public class VerverController
    private VerverDao ververDao;

    @Autowired
    public VerverController(VerverDao ververDao) {
        this.ververDao = ververDao;
    }
}

There is more information here.

Upvotes: 4

Barath
Barath

Reputation: 5283

Log clearly says

VerverController required a bean of type 'com.project.example.dao.VerverDao' that could not be found.

It means there is no bean of type com.project.example.dao.VerverDao

Add @Repository on top of VerverDao to resolve the issue.

@Repository
@AllArgsConstructor
public class VerverDao {

}

Note: Ensure VerverDao is in component scanning path as per your package structure.

Upvotes: 1

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