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

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