项目从spring2.2.6升级到2.3.0以后
validation相关代码找不到（import javax.validation.constraints.NotBlank）
We'll do the following:
remove the spring-boot-starter-validation from spring-boot-starter-web by default change spring-boot-starter-validation to use org.glassfish:jakarta.el instead of the current choice of default implementation update all the web servers starters to use that same el implementation for all
With this change, we don't need to add a new starter and we can consistently use the same el implementation.
解决方案
在pom.xml增加
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-validation</artifactId>
</dependency>
