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Understanding Spring Boot Configuration Priority
When building Spring Boot applications, managing configurations can get tricky. Did you know that Spring Boot looks for properties in multiple places? If you have the same setting in two different locations, Spring Boot follows a specific "Priority Order" to decide which one to use.
Why Priority Matters
Imagine you have a database password set in your code, but your boss wants to change it on the server without rebuilding the entire app. Because of Configuration Priority, you can override settings using Environment Variables or Command Line arguments easily!
The Common Order (Simplified)
Spring Boot generally checks these locations from highest priority to lowest:
- Command Line Arguments: Anything you type when starting the app.
- Environment Variables: System-level settings.
- Application Properties: The files inside your project (like
application.properties).
Pro Tip for Beginners
Always remember: external configurations (outside the JAR) usually win over internal ones. This makes your application flexible and ready for production!
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