intermediate~2h
Logging
print("here") doesn't survive past your laptop. This module is how a real Spring Boot service tells you what it's doing once it's running somewhere you can't attach a debugger.
Learning objectives
- Beginner: Add a logger to a class and log at the correct level (debug/info/warn/error) for a given situation.
- Intermediate: Configure logging output format and level per package in application.properties.
- Advanced: Set up structured (JSON) logging with a correlation/trace ID so a single request can be followed across log lines.
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Logging