解决异常Error creating bean with name ‘xxxxxController‘: Unsatisfied dependency expressed through field

以你之姓@ 2024-03-31 02:31 68阅读 0赞

解决异常Error creating bean with name ‘xxxxxController‘: Unsatisfied dependency expressed through field

## 错误信息如下： ##

Error creating bean with name 'dataInteractionController': Unsatisfied dependency expressed through field 'busiSysInfoService'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'busiSysInfoServiceImpl': Unsatisfied dependency expressed through field 'baseMapper'; nested exception is org.springframework.beans.factory.**NoSuchBeanDefinitionException: No qualifying bean of type 'com.example.demo.mapper.BusiSysInfoMapper' available**: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}

### 分析 ###

创建dataInteractionController这个bean出错，嵌套异常是busiSysInfoService不满足依赖，容器里面没有com.example.demo.mapper.BusiSysInfoMapper 的 实例，也就是说我们的busiSysInfoService对象不存在,导致注入失败，然后抛出了Error creating bean with name 'dataInteractionController这个异常，既然是busiSysInfoService这个对象的问题，那么我们就首先来分析，busiSysInfoService对象如何添加到容器，所以我们要看一下  
1、busiSysInfoServiceImpl 是否加上@Service注解  
2、busiSysInfoMapper 是否加上@Repository注解

如果以上都没有问题，考虑BusiSysInfo实体中各字段类型是否错误，如果都不存在，*请一定考虑以下问题*  
![在这里插入图片描述][94b26bc7a34e41ad8eaf121bb5cdbdc0.png_pic_center]  
沒有符合的bean可用

### 解决办法 ###

这种情况在DemoApplication中添加@MapperScan(basePackages = \{“com.example.demo.mapper”\})，我的问题是这样解决的。  
![在这里插入图片描述][4736e2b3ebee4890ba16147df44d77bc.png_pic_center]  
希望对大家有用

[94b26bc7a34e41ad8eaf121bb5cdbdc0.png_pic_center]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/31/cfcb05cf14684026ab7645806bb7aefa.png
[4736e2b3ebee4890ba16147df44d77bc.png_pic_center]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/31/942ad0d75d08461f80035e9dfec79396.png

解决异常Error creating bean with name ‘xxxxxController‘: Unsatisfied dependency expressed through field

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