org.springframework.beans.factory.NoSuchBeanDefinitionException 的解决思路

我的是名字相似，参数以及返回类型都相同，应该是这样

借鉴自:https://blog.csdn.net/butterfly_resting/article/details/80044863

个人分类： ExceptionSpringMVC

版权声明：如笔记。一点一滴，伴我成长。可转载 https://blog.csdn.net/Butterfly_resting/article/details/80044863

1. Caused by: org.springframework.beans.factory.BeanCreationException: Could not autowire field: private cn.itcast.crm.service.BaseDictService cn.itcast.crm.controller.CustomerController.baseDictService; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [cn.itcast.crm.service.BaseDictService] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}

2.  
3.  

4. 严重: StandardWrapper.Throwable

5. org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'customerController': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: private cn.itcast.crm.service.BaseDictService cn.itcast.crm.controller.CustomerController.baseDictService; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [cn.itcast.crm.service.BaseDictService] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}

 解决问题的思路：

1.如果您使用注释进行配置，则可能会缺少cn.itcast.crm.service.BaseDictService实现的注释（@Service或@Component）。

2.如果您使用（仅）xml，您可能会错过BaseDictService实现的<bean>定义。 

3.如果您使用注释并且实现注释正确，请检查扫描实现所在的包

（检查各自组件的自动扫描组件<context：component-scan base-package = “XXXX”）

或者（Spring自动扫描<context:annotation-config/>）

4.代码有无错误：例子如下,Service类实现接口具有相同申明方法的Mapper接口，都会导致Spring无法识别相应的bean：

1. public interface BaseDictMapper {

2. //根据类别代码查询数据

3. List<BaseDict> queryBaseDictByDictTypeCode(String dictTypeCode);

4.  

5. }

1. public interface BaseDictService {

2. //根据类别代码查询

3. List<BaseDict> queryBaseDictByDictTypeCode(String dictTypeCode);

4. }

1. public class BaseDictServiceImpl implements BaseDictMapper { //错误：应该实现为BaseDictService

2. @Autowired

3. private BaseDictMapper baseDictMapper;

4. @Override

5. public List<BaseDict> queryBaseDictByDictTypeCode(String dictTypeCode) {

6. List<BaseDict> list = this.baseDictMapper.queryBaseDictByDictTypeCode(dictTypeCode);

7. return list;

8. }

9. }