Logging in Spring Boot 4 | JDK 25 | by Mr Kiran Jadhav

What is Logging?
It means recording application information like: Errors, Warnings, Info messages, Debugging details
Spring Boot uses SLF4J as the logging implementation.

Why Logging is Important?
Helps find bugs
Helps monitor application behavior
Useful in production
Better than System.out.println()/IO.println()

Log Levels in Spring Boot
Level Purpose
TRACE Very detailed (developer-only)
DEBUG Debugging information
INFO Application flow messages
WARN Something unusual, not error
ERROR Something failed
FATAL Critical failure (not used often)

Yaml File-
logging:
level:
root: TRACE

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