Cron expressions for scheduling in Spring Boot - Mini Project: Build & Apply

Cron expressions for scheduling

📖 Scenario: You are building a Spring Boot application that needs to run tasks automatically at specific times. You will learn how to use cron expressions to schedule these tasks.

🎯 Goal: Create a Spring Boot component with a scheduled method that runs every minute using a cron expression.

📋 What You'll Learn

Create a Spring Boot component class named ScheduledTasks

Add a method named reportCurrentTime that prints the string "Current time reported"

Use the @Scheduled annotation with a cron expression to run the method every minute

Enable scheduling in the Spring Boot application

💡 Why This Matters

🌍 Real World

Scheduling tasks is common in real applications for things like sending emails, cleaning databases, or generating reports automatically.

💼 Career

Understanding cron expressions and scheduling in Spring Boot is essential for backend developers working on automation and timed processes.

1

Create the ScheduledTasks component

Create a class named ScheduledTasks annotated with @Component.

Spring Boot

// Your code here to create the ScheduledTasks class with @Component annotation

Need a hint?

Use @Component to make the class a Spring bean.

2

Add the reportCurrentTime method

Inside the ScheduledTasks class, add a public method named reportCurrentTime that returns void and prints the string "Current time reported".

Spring Boot

import org.springframework.stereotype.Component;

@Component
public class ScheduledTasks {
    // Add reportCurrentTime method here
}

Need a hint?

Define a method that prints the message to the console.

3

Schedule the method with a cron expression

Add the @Scheduled annotation to the reportCurrentTime method with the cron expression "0 * * * * *" to run it every minute.

Spring Boot

import org.springframework.stereotype.Component;
import org.springframework.scheduling.annotation.Scheduled;

@Component
public class ScheduledTasks {
    // Add @Scheduled annotation with cron expression here
    public void reportCurrentTime() {
        System.out.println("Current time reported");
    }
}

Need a hint?

Use @Scheduled(cron = "0 * * * * *") to run the method every minute.

4

Enable scheduling in the application

In your main Spring Boot application class, add the @EnableScheduling annotation above the class declaration.

Spring Boot

// Add @EnableScheduling annotation to your main Spring Boot application class
// Your code here

Need a hint?

Add @EnableScheduling to activate scheduled tasks in Spring Boot.