Multiple Spring boot CommandLineRunner based on command line argument

Question

I have created spring boot application with spring cloud task which should executes a few commands(tasks). Each task/command is shorted-lived task, and all tasks are start

Answer 1

Similar to this answer https://stackoverflow.com/a/44482525/986160 but using injection and less configuration.

Having a similar requirement, what has worked for me is to have one CommandLineApps class implementing CommandLineRunner, then inject all my other command line runners as @Component and use the first argument to delegate to one of the injected runners. Please note that the injected ones should not extend CommandLineRunner and not be annotated as @SpringBootAppplication.

Important: be careful though if you put the call in a crontab one call will destroy the previous one if it is not done.

Here is an example:

@SpringBootApplication
public class CommandLineApps implements CommandLineRunner {

    @Autowired
    private FetchSmsStatusCmd fetchSmsStatusCmd;

    @Autowired
    private OffersFolderSyncCmd offersFolderSyncCmd;

    public static void main(String[] args) {
        ConfigurableApplicationContext ctx = SpringApplication.run(CommandLineApps.class,  args);
        ctx.close();
    }

    @Override
    public void run(String... args) {

        if (args.length == 0) {
            return;
        }

        List restOfArgs = Arrays.asList(args).subList(1, args.length);

        switch (args[0]) {
            case "fetch-sms-status":
                fetchSmsStatusCmd.run(restOfArgs.toArray(new String[restOfArgs.size()]));
                break;
            case "offers-folder-sync":
                offersFolderSyncCmd.run(restOfArgs.toArray(new String[restOfArgs.size()]));
                break;
        }
    }
}

@Component
public class FetchSmsStatusCmd {

    [...] @Autowired dependencies    

    public void run(String[] args) {

        if (args.length != 1) {
            logger.error("Wrong number of arguments");
            return;
        }
        [...]
    }
 }