How can a Spring Batch Job be scheduled to run automatically when the application starts up?

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To schedule a Spring Batch job to run automatically when the application starts up, you can use the @Scheduled annotation on a method in a @Configuration class.

1. First, annotate the configuration class with @EnableScheduling so that Spring knows to look for scheduled tasks.

2. Then, create a method in the configuration class and annotate it with @Scheduled to indicate that it should be run according to a fixed schedule.

3. Inside the method, use the JobLauncher to launch the Spring Batch job.

Here is an example:

@Configuration
@EnableScheduling
public class BatchConfig {

    @Autowired
    private JobLauncher jobLauncher;

    @Autowired
    private Job myJob;

    @Scheduled(fixedDelay = 1000) // run every second
    public void runJob() throws JobParametersInvalidException, JobExecutionAlreadyRunningException, JobRestartException, JobInstanceAlreadyCompleteException {
        jobLauncher.run(myJob, new JobParameters());
    }
}

In this example, the runJob() method will be automatically executed every second due to @Scheduled(fixedDelay = 1000). Inside the method, the JobLauncher launches the myJob Spring Batch job with an empty JobParameters object.

Note: If you don't want your job to be executed repeatedly, you can change fixedDelay to something like fixedRate or use a Cron expression to schedule your job according to your needs.