Pré-requisitos

• Backend Development with Spring Boot

Logging is a critical part of every Spring application, helping you track events, debug issues, and maintain reliable systems. In this chapter, you will explore the fundamentals of logging, understand why it matters, and see how Spring Boot simplifies the process. By the end, you will be ready to set up effective logging and make your applications easier to monitor and troubleshoot.

Logging

Logging is the process of recording information about what happens in your application while it runs. This information can include errors, system events, user actions, and other important details. Logs are usually stored in files or displayed on the console, making it easier for you to see what your application is doing at any time.

In Spring Boot applications, logging is especially important because it helps you understand how your app behaves, find and fix errors quickly, and monitor performance. When something goes wrong, logs show you what happened and when, so you do not have to guess. Good logging practices make it easier to maintain and improve your application over time.

Here are some basic concepts you should know:

• Log levels: control the amount and type of information recorded; common levels are ERROR, WARN, INFO, DEBUG, and TRACE.
• Log messages: the actual text or data written to the log, describing events or errors;
• Log output: where the log messages are sent, such as the console, files, or external systems.

Understanding these basics will help you set up effective logging in your Spring Boot applications and make troubleshooting much easier.