How to configure Logback in Spring boot application to print the log in the console and file?

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Understanding Spring Boot Logback Configuration

Logging is a critical part of any application. It helps developers track what is happening inside the code, especially when things go wrong. In Spring Boot, Logback is the default logging framework, and it is incredibly powerful yet simple to set up.

1. Why Use Logback?

While standard print statements (like System.out.println) work for quick tests, they aren't suitable for real-world apps. Logback allows you to:

• Control different levels of logging (Info, Debug, Error).
• Format how logs look (adding timestamps, thread names, etc.).
• Save logs to files automatically so you can read them later.

2. Console Logging

Console logging is what you see in your IDE terminal when you run your application. By default, Spring Boot logs at the INFO level. You can easily change this in your application.properties or logback-spring.xml file to see more detailed messages if you are debugging a problem.

3. File Logging

In production, you can't watch a console 24/7. File logging allows your app to write logs into a .log file on your server. You can configure "Rolling Policies," which means the system will create a new file every day or every time the file reaches a certain size, preventing your storage from filling up.

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