型...發現依賴沒有匹配的豆....預期至少1 Bean上有資格作爲候選人自動裝配

這已經回答了好幾次，但我所有的註解集，它似乎正確佈線。型...發現依賴沒有匹配的豆....預期至少1 Bean上有資格作爲候選人自動裝配

UserService接口：

public interface UserService { 

    User findUserById(Long id); 
    User findUserByName(String name); 
    List<User> findAllUsers(); 
    void saveUser(User user); 
    void updateUser(User user); 
    void deleteUserById(long id); 
    void deleteAllUsers(); 
    public boolean isUserExist(User user); 
}

UserServiceImpl

@Service 
@Transactional 
public class UserServiceImpl implements UserService { 

    private static final AtomicLong counter = new AtomicLong(); 

    private static List<User> users; 

    static { 
     users = populateDummyUsers(); 
    } 

    @Override 
    public User findUserById(Long id) { 

     for (User user : users) { 
      if (user.getId() == id) { 
       return user; 
      } 
     } 

     return null; 
    } 

    @Override 
    public User findUserByName(String name) { 
     for (User user : users) { 
      if (user.getUsername().equalsIgnoreCase(name)) { 
       return user; 
      } 
     } 
     return null; 
    }

測試用例這是失敗的：

@RunWith(SpringJUnit4ClassRunner.class) 
@SpringApplicationConfiguration(classes = SpringCrudApplication.class) 
@ComponentScan("com.service") 
public class ServiceTest { 


    private UserService userService; 

    @Autowired 
    public void setUserService(UserService userService) { 
     this.userService = userService; 
    } 

    @Test 
    public void findUserByIdTest() throws Exception { 

     long id = (long) 0; 
     User userTest = new User(id,"Mike","644 Main St", "[email protected]"); 

     User user = userService.findUserById(id); 

     assert user.getAddress() != null; 
     assert user.getEmail() != null; 
     assert user.getUsername() != null; 

    }

我曾嘗試使用componentScan在測試類上com.service和com.serviceImpl沒有運氣。

完整的錯誤：

org.springframework.beans.factory.UnsatisfiedDependencyException: 
Error creating bean with name 'com.service.test.ServiceTest': 
Unsatisfied dependency expressed through method 'setUserService' 
parameter 0: No qualifying bean of type [com.service.UserService] 
found for dependency [com.service.UserService]: expected at least 1 
bean which qualifies as autowire candidate for this dependency. 
Dependency annotations: {}; nested exception is 
org.springframework.beans.factory.NoSuchBeanDefinitionException: No 
qualifying bean of type [com.service.UserService] found for 
dependency [com.service.UserService]: expected at least 1 bean which 
qualifies as autowire candidate for this dependency. Dependency 
annotations: {}

------------------- SOLUTION ----------- --------

我不得不@ComponentScan添加到主方法：

@SpringBootApplication 
@ComponentScan("com.serviceImpl, com.service") 
public class SpringCrudApplication { 

    public static void main(String[] args) { 

     SpringApplication.run(SpringCrudApplication.class, args); 
    } 
}

來源

2016-03-09 Drew1208

實現必須通過ComnponentScan，而不是接口被發現。因此，如果您的類UserServiceImpl位於包com.serviceImpl中，則必須掃描此包。

包名稱看起來很奇怪，包名只應該是小寫。因此，請嘗試將程序包重命名爲com.service.impl並進行掃描。

由於您使用@事務，春天就會創建一個實現UserService的代理。所以你只能獲得UserService注入，但不能獲得UserServiceImpl。檢查您的代碼，可能是您正在嘗試@Autowire其他地方的UserServiceImpl。

除了你的例外'沒有匹配的類型的bean'，在堆棧跟蹤中經常會出現像'could not autowire'這樣的按摩，它精確地告訴春天試圖注入哪種類型。

來源

2016-03-10 20:36:23

我加了完整的錯誤。我在測試類和UserServiceImpl中使用了componentScan（「com.service」）。我還添加了我的目錄的屏幕截圖。 – Drew1208

型...發現依賴沒有匹配的豆....預期至少1 Bean上有資格作爲候選人自動裝配

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