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<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,

BaseDictMapper在mapper文件下并在相关的mapper.xml进行相关配置,BaseDictService在service文件下并做了相关的spring配置文件做了对应的配置。Service实现具有相同申明方法的mapper接口(而spring并不能扫描到mapper文件夹下的接口和类),因此BeanFactory在Spring Context中没有找到bean的实例,最终导致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); }
public interface BaseDictService {
//根据类别代码查询
List<BaseDict> queryBaseDictByDictTypeCode(String dictTypeCode);
}
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;
}
}

5.是否确实与注入相关便签的依赖。比如dubbo服务下,添加了spring的相关依赖但是服务端并不需要Spring的@Service标签,而是dubbo的@Service标签。检查maven依赖是否正确,修改完毕记得Install,report下

简单代码:

pom.xml

<dependencies>
<!-- Spring -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-beans</artifactId>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-aspects</artifactId>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jms</artifactId>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context-support</artifactId>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-test</artifactId>
</dependency>
<!-- dubbo相关 -->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>dubbo</artifactId>
</dependency>
<dependency>
<groupId>org.apache.zookeeper</groupId>
<artifactId>zookeeper</artifactId>
</dependency>
<dependency>
<groupId>com.github.sgroschupf</groupId>
<artifactId>zkclient</artifactId>
</dependency>
...
</dependencies>

service:

import com.alibaba.dubbo.config.annotation.Service;
import com.chunxiansheng.mapper.TbBrandMapper;
import com.chunxiansheng.pojo.TbBrand;
import com.chunxiansheng.service.BrandService;
import org.springframework.beans.factory.annotation.Autowired; import java.util.List; @Service
public class BrandServiceImpl implements BrandService { @Autowired
private TbBrandMapper brandMapper;
...
}

6.检查数据源,JDBC等有没有配置错误。

例如具体查看mapper,dao下的spring配置文件和db.properties的配置。

7.推荐使用SpringBoot,可以减少很多配置的操作,适合开发。

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