spring-boot-rest/spring-web-modules/spring-mvc-basics-3/src/main/resources/application.properties

spring.main.allow-bean-definition-overriding=true

spring.mail.host=localhost
spring.mail.port=8025

spring.thymeleaf.cache=false
spring.thymeleaf.enabled=true 
spring.thymeleaf.prefix=classpath:/templates/
spring.thymeleaf.suffix=.html