Enabling Task Scheduling

To utilize scheduled tasks in Spring Boot, enable scheduling support by adding the @EnableScheduling annotation to your main application class.

@SpringBootApplication
@EnableScheduling
public class Application {
    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }
}

Creating Scheduled Tasks

Scheduled tasks must be defined with in Spring-managed beans. Create a component class and anontate methods with @Scheduled to define execution patterns.

@Component
@Slf4j
public class TaskScheduler {
    
    private final DateTimeFormatter timeFormat = DateTimeFormatter.ofPattern("HH:mm:ss");
    
    @Scheduled(fixedRate = 3000)
    public void executePeriodically() {
        log.info("Fixed rate execution: {}", LocalDateTime.now().format(timeFormat));
    }
    
    @Scheduled(fixedDelay = 3000)
    public void executeWithDelay() {
        log.info("Fixed delay execution: {}", LocalDateTime.now().format(timeFormat));
    }
    
    @Scheduled(initialDelay = 2000, fixedRate = 3000)
    public void delayedExecution() {
        log.info("Delayed periodic execution: {}", LocalDateTime.now().format(timeFormat));
    }
    
    @Scheduled(cron = "*/3 * * * * ?")
    public void cronBasedExecution() {
        log.info("Cron-based execution: {}", LocalDateTime.now().format(timeFormat));
    }
}

The @Scheduled annottaion supports multiple configuration options:

• fixedRate: Executes tasks at fixed time intervals
• fixedDelay: Waits for a specified delay after completion before next execution
• initialDelay: Sets the delay before the first execution
• cron: Defines complex schedules using cron expressions