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

org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'deptController': Unsatisfied dependency expressed through field 'departmentMapper'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'departmentMapper' defined in file 

出现什么对象都不能创建是因为

问题所在:
在springboot的application.yml或者application.properties不能同时使用以下两个配置,换句话说,两者配置方式只能取其一.
mybatis:
config-location: classpath:mybatis/mybatis-config.xml
configuration:
map-underscore-to-camel-case: true
解决：注释掉