Caused by: java.lang.ClassNotFoundException: org.springframework.boot.bind.RelaxedPropertyResolver

Caused by: java.lang.ClassNotFoundException: org.springframework.boot.bind.RelaxedPropertyResolver

这个错误是由于没有添加：

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.1.1.RELEASE</version>
</parent>

从而找不到RelaxedPropertyResolver这个类