All possible ways to run code on application startup in Spring boot

ApplicationStartupConfiguration.java

package com.springhow.examples.springboot.startupcode;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.SmartInitializingSingleton;
import org.springframework.boot.ApplicationArguments;
import org.springframework.boot.ApplicationRunner;
import org.springframework.boot.CommandLineRunner;
import org.springframework.boot.context.event.ApplicationStartedEvent;
import org.springframework.boot.context.event.ApplicationStartingEvent;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.event.EventListener;

@Configuration
public class ApplicationStartupConfiguration {

  private static final Logger log = LoggerFactory.getLogger(ApplicationStartupConfiguration.class);

  @Bean
  CommandLineRunner commandLineRunner() {
    return new CommandLineRunner() {
      @Override
      public void run(String... args) throws Exception {
        log.info("~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~");
        log.info("These Lines will get printed on application startup");
        log.info("~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~");
      }
    };
  }

  @Bean
  ApplicationRunner applicationRunner() {
    return new ApplicationRunner() {
      @Override
      public void run(ApplicationArguments args) throws Exception {
        log.info("~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~");
        log.info("These Lines will get printed on application startup too");
        log.info("~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~");
      }
    };
  }

  @EventListener
  public void executeOnStartup(ApplicationStartedEvent event) {
    log.info("~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~");
    log.info("Another way to run something on application startup with event {}", event);
    log.info("~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~");
  }


  @Bean
  SmartInitializingSingleton smartInitializingSingleton(ApplicationContext context) {
    return () -> {
      log.info("This runs on startup too... {}", context);
    };
  }
}