Running code once at application startup.

• Category: Spring Boot Project Components — part of the Spring Boot Tutorial on GoCareerGo
• Read the short summary above, then check the linked docs for full syntax/behaviour
• Interview tip: be ready to explain "CommandLineRunner and ApplicationRunner" in one sentence, then back it up with a tiny example

// CommandLineRunner and ApplicationRunner — minimal example
// See the Spring / Spring Boot reference docs for the exact API for this topic.