Spring Boot logging tutorial
Logging in Java is a challenging task at the best of times.
Whether it's the vast array of logging frameworks to choose from or the difficulty of configuring logging to balance reporting and performance, setting up logging in your Java applications and microservices can be complex.
Spring logging tutorial
Fortunately, Spring Boot, through its Spring logging dependency, greatly simplifies the process to efficiently and effectively generate runtime reports.
In this Spring Boot logging tutorial, programmers and developers will learn the following:
- Why developers must avoid System.out.println in favor of proper logging practices.
- How to configure a logging framework such as SLF4J in Spring Boot.
- The purpose of the static LoggerFactory.getLogger() method call.
- The difference between TRACE, DEBUG, INFO, WARN, ERROR and FATAL logging levels.
- How to control console log output via Spring's application.properties file.
- How to customize Spring's logging format for cleaner output during development.
- How to replace the default Spring Boot banner with a custom banner.txt file.
- How to use Spring profiles, including dev or preprod to isolate logging configurations.
- The purpose of debug=true to view active and inactive Spring autoconfigurations.
Learn logging in Spring Boot
When developers employ proper logging practices, the ability to debug and fix applications under development -- or monitor and troubleshoot them at runtime -- is greatly enhanced.
Built-in support for SLF4J, customizable output formats and profile-based configuration make Spring Boot logging both accessible and efficient.
Cameron McKenzie has been a Java EE software engineer for 20 years. His current specialties include Agile development; DevOps; Spring; and container-based technologies such as Docker, Swarm and Kubernetes.