beginner~2h
Properties, Profiles & Starters
The last foundations piece before you build anything real: how Spring Boot gets its configuration, how that configuration changes per environment, and what a "starter" dependency actually bundles.
Learning objectives
- Beginner: A single application.properties file for local development with a local database URL.
- Intermediate: Separate local/prod profile files, with secrets like DB passwords resolved from environment variables rather than committed to either file.
- Advanced: @Profile-annotated beans swapping entire implementations (e.g. a mock payment gateway in "test" vs. a real one in "prod"), combined with externalized secrets management for production credentials.
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Properties, Profiles & Starters