Snippet

Executing Logic on Startup

The CommandLineRunner interface is used to run specific code immediately after the Spring application context has been fully initialized. This is ideal for one-time setup tasks or seed data generation.

snippet.java

java

@Component
public class StartupRunner implements CommandLineRunner {
    @Override
    public void run(String... args) {
        System.out.println("The Spring application has started!");
    }
}

spring

Breakdown

@Component

Registers this class as a Spring-managed bean so it can be automatically detected.

implements CommandLineRunner

The interface that grants access to the startup execution hook.

public void run(String... args)

The method where your startup logic is placed; 'args' contains any command-line arguments.

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Executing Logic on Startup

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