November 12, 2023
      No Comments
      Armando Marques

There are two ways of configure CommandLineRunner.

Table of Contents

Extension

https://www.baeldung.com/spring-boot-console-app

@SpringBootApplication
public class SpringBootConsoleApplication 
  implements CommandLineRunner {

    private static Logger LOG = LoggerFactory
      .getLogger(SpringBootConsoleApplication.class);

    public static void main(String[] args) {
        LOG.info("STARTING THE APPLICATION");
        SpringApplication.run(SpringBootConsoleApplication.class, args);
        LOG.info("APPLICATION FINISHED");
    }
 
    @Override
    public void run(String... args) {
        LOG.info("EXECUTING : command line runner");
 
        for (int i = 0; i < args.length; ++i) {
            LOG.info("args[{}]: {}", i, args[i]);
        }
    }
}

Bean definition

@SpringBootApplication
public class HelloWordApplication {

	public static void main(String[] args) {
		SpringApplication.run(HelloWordApplication.class, args);
	}


	@Bean
	public CommandLineRunner commandLineRunner(ApplicationContext ctx) {
		return args -> {

			System.out.println("Hello World.");

			System.out.println("Let's inspect the beans provided by Spring Boot:");

			String[] beanNames = ctx.getBeanDefinitionNames();
			Arrays.sort(beanNames);
			for (String beanName : beanNames) {
				System.out.println(beanName);
			}

		};
	}

}