Thymeleaf和Spring Security整合时, 发现sec:authorize="hasRole('ROOT')"标签不能被解析，在pom中添加如下依赖即可:

<dependency>
    <groupId>org.thymeleaf.extras</groupId>
    <artifactId>thymeleaf-extras-springsecurity4</artifactId>
    <version>3.0.2.RELEASE</version>
</dependency>

Env: springboot2 spring security5