【问题】org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name

org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name'roleController': Unsatisfied dependency expressed through field'roleService';xxxxxxx...
This kind of error can first check mapper.xml for errors, because it is caused by a mapping error. Spring cannot find the created class (bean)