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

最新推荐文章于 2024-11-07 22:28:38 发布

转载最新推荐文章于 2024-11-07 22:28:38 发布 · 458 阅读

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原文链接：https://juejin.im/post/5cc4fa4151882525130163dd

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#java

本文详细解析了Spring框架中因依赖注入失败导致的BeanCreationException异常，主要聚焦于BaseDictService实现类的问题。提供了检查服务实现注解、XML配置、扫描包路径以及避免Service与Mapper接口混淆的解决方案。

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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)} 严重: StandardWrapper.Throwable 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等）。

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

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：

public interface BaseDictMapper {
     //根据类别代码查询数据
      List<BaseDict> queryBaseDictByDictTypeCode(String dictTypeCode);
 
}
根据类别代码查询数据
      List<BaseDict> queryBaseDictByDictTypeCode(String dictTypeCode);

}
复制代码

根据类别代码查询数据 List queryBaseDictByDictTypeCode(String dictTypeCode);

}

public interface BaseDictService {
      //根据类别代码查询
      List<BaseDict> queryBaseDictByDictTypeCode(String dictTypeCode);
}
复制代码

public class BaseDictServiceImpl implements BaseDictMapper {//错误：应该实现为BaseDictService
      @Autowired
      private BaseDictMapper baseDictMapper;
      @Override
      public List<BaseDict> queryBaseDictByDictTypeCode(String  dictTypeCode)  {
            List<BaseDict> list =  this.baseDictMapper.queryBaseDictByDictTypeCode(dictTypeCode);
            return list;
      }
}
``复制代码

转载于:https://juejin.im/post/5cc4fa4151882525130163dd