Logger creation in classes in Spring Boot - Mini Project: Build & Apply

Logger Creation in Spring Boot Classes

📖 Scenario: You are building a Spring Boot application that needs to record messages for debugging and monitoring. Logging helps developers see what the app is doing behind the scenes, like a diary for the program.

🎯 Goal: Create a logger inside a Spring Boot class using the recommended pattern. This logger will allow the class to write messages to the console or log files.

📋 What You'll Learn

Create a Spring Boot class named MyService

Add a private static final logger variable named logger using LoggerFactory.getLogger()

Use the MyService.class as the argument to getLogger()

Write a method logMessage() that logs an info-level message "Logging is set up!"

💡 Why This Matters

🌍 Real World

Logging is essential in real applications to understand app behavior and troubleshoot issues.

💼 Career

Knowing how to set up and use loggers is a basic skill for Java developers working with Spring Boot.

1

Create the Spring Boot class

Create a public class named MyService in Java.

Spring Boot

// Your code here
// Create a public class named MyService

Need a hint?

Use public class MyService { } to define the class.

2

Add the logger variable

Inside the MyService class, add a private static final logger variable named logger initialized with LoggerFactory.getLogger(MyService.class). Import org.slf4j.Logger and org.slf4j.LoggerFactory.

Spring Boot

public class MyService {
    // Your code here
    // Add private static final Logger logger = LoggerFactory.getLogger(MyService.class);
}

Need a hint?

Use private static final Logger logger = LoggerFactory.getLogger(MyService.class); inside the class.

3

Create the logMessage method

Add a public method named logMessage inside MyService that calls logger.info("Logging is set up!").

Spring Boot

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class MyService {
    private static final Logger logger = LoggerFactory.getLogger(MyService.class);
    // Your code here
    // Add public void logMessage() method that calls logger.info("Logging is set up!")
}

Need a hint?

Define public void logMessage() { logger.info("Logging is set up!"); } inside the class.

4

Complete the class with imports and method

Ensure the MyService class includes the imports for Logger and LoggerFactory, the private static final logger variable, and the logMessage() method.

Spring Boot

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class MyService {
    private static final Logger logger = LoggerFactory.getLogger(MyService.class);

    public void logMessage() {
        logger.info("Logging is set up!");
    }
    // Your code here if needed
}

Need a hint?

Check that all parts are present: imports, logger variable, and method.