Scheduled tasks with @Scheduled in Spring Boot - Mini Project: Build & Apply

Scheduled tasks with @Scheduled

📖 Scenario: You are building a simple Spring Boot application that needs to perform a task repeatedly at fixed intervals. For example, sending a reminder message every 10 seconds.

🎯 Goal: Create a Spring Boot component that uses the @Scheduled annotation to run a method every 10 seconds.

📋 What You'll Learn

Create a Spring Boot component class named ReminderService

Add a method named sendReminder inside ReminderService

Configure the method sendReminder to run every 10 seconds using @Scheduled

Enable scheduling in the Spring Boot application

💡 Why This Matters

🌍 Real World

Scheduled tasks are used in many applications to perform regular maintenance, send notifications, or update data automatically without user intervention.

💼 Career

Understanding how to use @Scheduled in Spring Boot is important for backend developers who build reliable and automated services.

1

Create the ReminderService component

Create a Spring component class named ReminderService with an empty method called sendReminder.

Spring Boot

import org.springframework.stereotype.Component;

@Component
public class ReminderService {
    
    public void sendReminder() {
        // Your code here
    }
}

Need a hint?

Use @Component to make the class a Spring bean.

2

Enable scheduling in the application

Add the @EnableScheduling annotation to your main Spring Boot application class to activate scheduled tasks.

Spring Boot

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.scheduling.annotation.EnableScheduling;

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

// ReminderService class here
@Component
public class ReminderService {
    
    public void sendReminder() {
        
    }
}

Need a hint?

Put @EnableScheduling above your main application class.

3

Add the @Scheduled annotation to the method

Add the @Scheduled(fixedRate = 10000) annotation to the sendReminder method to run it every 10 seconds.

Spring Boot

import org.springframework.scheduling.annotation.Scheduled;

@Component
public class ReminderService {
    
    @Scheduled(fixedRate = 10000)
    public void sendReminder() {
        // Your code here
    }
}

Need a hint?

Use @Scheduled(fixedRate = 10000) to run the method every 10 seconds.

4

Add a simple print statement inside the scheduled method

Inside the sendReminder method, add System.out.println("Reminder: Time to take a break!"); to show a message each time the method runs.

Spring Boot

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.scheduling.annotation.EnableScheduling;
import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.stereotype.Component;

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

@Component
public class ReminderService {
    
    @Scheduled(fixedRate = 10000)
    public void sendReminder() {
        // Your code here
    }
}

Need a hint?

Use System.out.println inside the method to print the reminder message.