How would you manage and validate configuration in a Spring Boot service?

Binds typed configuration, understands property precedence, validates startup invariants, and keeps secrets outside source control.

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TL;DR

I bind related settings into typed @ConfigurationProperties classes instead of scattering @Value strings. I validate required values and ranges at startup so the service fails clearly before receiving traffic. Environment-specific values are supplied externally through supported property sources, while secrets come from a secret manager or platform injection and never from the repository.

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Externalized configuration, property source order, profiles, ConfigurationProperties, validation, secret injection, and diagnostics.

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Core answer
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Overview
Spring Boot configuration is flexible, so production safety depends on knowing which source wins and rejecting invalid combinations early.
I bind related settings into typed @ConfigurationProperties classes instead of scattering @Value strings. I validate required values and ranges at startup so the service fails clearly before receiving traffic. Environment-specific values are supplied externally through supported property sources, while secrets come from a secret manager or platform injection and never from the repository.
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Stronger answer
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Spring Boot has a defined property-source precedence, so command-line arguments, environment variables, configuration files, and defaults can override one another. Profiles select coherent environment behavior, but I avoid a large web of profile-specific beans that is hard to reason about. Validation includes cross-field rules such as a timeout being shorter than an overall deadline, and startup errors identify the property without printing its secret value.

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Details

Scattering untyped strings throughout the application.
Committing production secrets in application files.
Relying on defaults for safety-critical limits.

How would you manage and validate configuration in a Spring Boot service?

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