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?

spring boot 報錯：
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不支持熱部署，不支持devtool。

解決方法：在pom.xml屏蔽掉熱部署就OK了。

<!-- 熱啟動配置  -->
 <dependency>
     <groupId>org.springframework.boot</groupId>
     <artifactId>spring-boot-devtools</artifactId>
     <optional>true</optional>
 </dependency>