Reload Templates without Restarting the Container

https://docs.spring.io/spring-boot/docs/current/reference/htmlsingle/#howto-hotswapping

Thymeleaf Templates

If you use Thymeleaf, set spring.thymeleaf.cache to false. See ThymeleafAutoConfiguration for other Thymeleaf customization options.

FreeMarker Templates

If you use FreeMarker, set spring.freemarker.cache to false. See FreeMarkerAutoConfiguration for other FreeMarker customization options.

Groovy Templates

If you use Groovy templates, set spring.groovy.template.cache to false. See GroovyTemplateAutoConfiguration for other Groovy customization options.

DEMO:
https://github.com/imrexhuang/Spring-Boot-Security-Thymeleaf-Demo