How to Fix Logback File Logging Issues When Switching to JSON Format

Discover how to resolve the issue of Logback not creating log files in JSON format with our comprehensive guide.
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Why Isn't My Logback Log File Being Created?

If you're using SLF4J for logging in a Spring Boot application, you may have previously enjoyed the convenience of logging to a file. However, when switching to Logback for JSON formatted logs, you might run into a problem where the log file simply isn’t being created. While the console reflects your logs in the desired JSON format, it can be frustrating if you want to have a persistent file log as well.

In this guide, we will explore how to address this issue and ensure that your logs are properly written to a file, while maintaining the JSON format you require.

Understanding the Issue

To illustrate the setup you were working with, let's break down the configurations you mentioned:

Key Configuration Files

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POM.xml Dependencies

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While everything seemed correctly set up for console logging, the absence of a file logging configuration is what led to your issue.

The Solution: Adding a File Appender

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Key Points in the Configuration

Rolling Policy: Defines how logs will be archived based on size and time. In this setup, files are compressed once they exceed 10MB.

Loggers: The root logger and specified logger need to refer to the appender you created.

Final Thoughts

By ensuring you have a correctly configured file appender in your Logback setup, you can maintain the structured logging you require while solving issues related to file creation.

If you encounter any further difficulties or have questions about your logging setup, feel free to ask!