Spring first request very slow

Question

I have application in Spring Boot. After initialization of Spring Boot with embeded tomcat, the first response is very slow. How can I fix it? Has spring boot any warmup command/mode? I am thinking too about connection with database and I am wondering about connection database, probably spring connects with Postgres during first request.

Answer 1

You could either use ApplicationRunner or CommandlineRunner to run something on startup:

https://docs.spring.io/spring-boot/docs/current/reference/htmlsingle/#boot-features-command-line-runner