Scheduled tasks with @Scheduled in Spring Boot - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to schedule a method to run every 5 seconds.

Spring Boot

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

@Component
public class TaskScheduler {

    @Scheduled(fixedRate = [1])
    public void runTask() {
        System.out.println("Task executed");
    }
}

Drag options to blanks, or click blank then click option'

A"5s"

B5

C5000

D1000

Attempts:

3 left

💡 Hint

Common Mistakes

Using seconds instead of milliseconds

Using string values instead of numbers

The fixedRate attribute expects milliseconds. To run every 5 seconds, use 5000.

2fill in blank

medium

Complete the code to schedule a method to run every day at 2:30 AM.

Spring Boot

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

@Component
public class DailyTask {

    @Scheduled(cron = [1])
    public void runDaily() {
        System.out.println("Daily task executed");
    }
}

Drag options to blanks, or click blank then click option'

A"0 30 2 * * ?"

B"0 2 30 * * ?"

C"30 2 * * *"

D"0 0 2 * * ?"

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing up minute and hour positions

Omitting seconds field

The cron expression "0 30 2 * * ?" means at second 0, minute 30, hour 2 every day.

3fill in blank

hard

Fix the error in the code to enable scheduling in the Spring Boot application.

Spring Boot

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

@SpringBootApplication
[1]
public class MyApp {

    public static void main(String[] args) {
        SpringApplication.run(MyApp.class, args);
    }
}

Drag options to blanks, or click blank then click option'

A@EnableScheduling

B@Scheduled

C@Component

D@Configuration

Attempts:

3 left

💡 Hint

Common Mistakes

Using @Scheduled on the main class

Forgetting to enable scheduling

The @EnableScheduling annotation enables Spring's scheduled task execution capability.

4fill in blank

hard

Fill both blanks to create a scheduled method that runs every minute and logs the current time.

Spring Boot

import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.stereotype.Component;
import java.time.LocalTime;

@Component
public class ClockTask {

    @Scheduled(cron = [1])
    public void logTime() {
        System.out.println("Current time: " + LocalTime.[2]());
    }
}

Drag options to blanks, or click blank then click option'

A"0 * * * * ?"

B"fixedRate = 60000"

Cnow

Attempts:

3 left

💡 Hint

Common Mistakes

Using fixedRate with wrong value

Using incorrect LocalTime method

The cron expression '0 * * * * ?' runs the method every minute at second 0. The LocalTime.now() method gets the current time.

5fill in blank

hard

Fill all three blanks to create a scheduled task that runs every 10 seconds, prints a message, and uses a component annotation.

Spring Boot

import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.[1].Component;

@[2]
public class MessageTask {

    @Scheduled(fixedRate = [3])
    public void printMessage() {
        System.out.println("Hello every 10 seconds");
    }
}

Drag options to blanks, or click blank then click option'

Astereotype

BComponent

C10000

DConfiguration

Attempts:

3 left

💡 Hint

Common Mistakes

Wrong import package

Using @Configuration instead of @Component

Wrong fixedRate value

The @Component annotation marks the class as a Spring bean. It is imported from org.springframework.stereotype.Component. The fixedRate is set to 10000 milliseconds for 10 seconds.