Spring Boot，不创建beans@controller，@service

Question

这是我的项目目录结构。

所有controller和其他类以及bean目录都在“WebPortalApplication”类下，正如Spring Boot doc所述，我们没有明确指定要扫描bean的包，只要这些包位于“main”类目录下，对吗？因此，当我运行“WebPortalApplication”文件时，它会生成，但有这样的例外。

org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'userRestController': Unsatisfied dependency expressed through field 'userService'; 

Caused by: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'userService': Unsatisfied dependency expressed through field 'roleRepository'; 

Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'roleRepository': Invocation of init method failed; nested exception is java.lang.IllegalArgumentException:

Caused by: java.lang.IllegalArgumentException: Not a managed type: class com.epam.webPortal.model.Role

@RestController公共类

@Autowired
UserService userService;
private static final Logger LOGGER = LoggerFactory.getLogger(UserRestController.class);

//-------------------Retrieve All Users--------------------------------------------------------
@RequestMapping(value = "/user/", method = RequestMethod.GET)
public String listAllUsers() {
    String userAsJson = "";
    List<User> users = userService.findAllUsers();
    try {
        userAsJson = JsonConvertor.toJson(users);
    } catch (Exception ex) {
        LOGGER.error("Something went wrong during converting json format");
    }
    LOGGER.info("displaying all users in json format");
    return userAsJson;

}

 package com.epam.webPortal.service.user;

import com.epam.webPortal.model.User;
import com.epam.webPortal.repository.role.RoleRepository;
import com.epam.webPortal.repository.user.UserRepository;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional

import java.util.Date;
import java.util.HashSet;
import java.util.List;

@Service("userService")
@Transactional
public class UserServiceImpl implements UserService {

    private static final Logger LOGGER = LoggerFactory.getLogger(UserServiceImpl.class);

    @Autowired
    private UserRepository userRepository;
    @Autowired
    private RoleRepository roleRepository;
    @Autowired
    private BCryptPasswordEncoder bCryptPasswordEncoder;

    @Override
    public void saveUser(User user) {
        user.setPassword(bCryptPasswordEncoder.encode(user.getPassword()));
        user.setRoles(new HashSet<>(roleRepository.findAll()));
        user.setDateRegistered(new Date());
        userRepository.save(user);
        LOGGER.info("user with username {} successfully saved", user.getUsername());
    }

    @Override
    public User findByUsername(String username) {
        return userRepository.findByUsername(username);
    }

    @Override
    public List<User> findAllUsers() {
        return userRepository.findAllUsers();
    }

    @Override
    public User findById(Long Id) {
        return userRepository.findById(Id);
    }

    @Override
    public void updateUser(User user) {
        final User entity = userRepository.findById(user.getId());
        if (entity != null) {
            entity.setFirstName(user.getFirstName());
            entity.setLastName(user.getLastName());
            entity.setEmail(user.getEmail());
            entity.setSkypeID(user.getSkypeID());
            entity.setDateRegistered(new Date());
            entity.setPassword(bCryptPasswordEncoder.encode(user.getPassword()));
            userRepository.save(entity);
            LOGGER.info("user with id {} successfully updated", user.getId());
        }
    }

    @Override
    public void deleteUserById(Long id) {
        userRepository.deleteById(id);
        LOGGER.info("user with id {} successfully deleted", id);
    }
}

package com.epam.webPortal.model;

import javax.persistence.*;
import java.util.Set;

@Entity
@Table(name = "role")
public class Role {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;
    private String name;

    @ManyToMany(mappedBy = "roles", fetch = FetchType.EAGER)
    private Set<User> users;

    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Set<User> getUsers() {
        return users;
    }

    public void setUsers(Set<User> users) {
        this.users = users;
    }
}

Answer 1

看起来您使用的是JPA。所有JPA实体都必须用@Entity注释。

Caused by: java.lang.IllegalArgumentException: Not a managed type: class com.epam.webPortal.model.Role

意味着，Role类缺少@Entity注释。