spring boot 报错 Invalid property 'mapperHelper' of bean class [org.mybatis.spring.mapper.MapperFactor

spring boot 报错： 

Caused by: org.springframework.beans.NotWritablePropertyException: Invalid property ‘mapperHelper’ of bean class [org.mybatis.spring.mapper.MapperFactoryBean]: Bean property ‘mapperHelper’ is not writable or has an invalid setter method. Does the parameter type of the setter match the return type of the getter?

原因是：通用mapper不支持热部署，不支持devtool。

解决方法：在pom.xml屏蔽掉热部署就OK了。

org.springframework.bootspring-boot-devtoolstrue