`@ConfigurationProperties` vs `@Value`: when should you prefer `@ConfigurationProperties`?

Deep dive

Expanding on the short answer — what usually matters in practice:

• Context (tags): spring-boot, configuration, properties, validation
• Lifecycle: what happens at runtime (render/build, request/response, background jobs).
• Caching: where cache lives, cache keys, how to invalidate without chaos.
• Security: authn/authz, secrets, attack surface (SSRF/CSRF).
• Explain the "why", not just the "what" (intuition + consequences).
• Trade-offs: what you gain/lose (time, memory, complexity, risk).
• Edge cases: empty inputs, large inputs, invalid inputs, concurrency.

Examples

Here’s an additional example (building on the short answer):

@ConfigurationProperties(prefix = "app")
public class AppProps {
  private String name;
  public String getName() { return name; }
  public void setName(String name) { this.name = name; }
}

Common pitfalls

• Too generic: no concrete trade-offs or examples.
• Mixing average-case and worst-case (e.g., complexity).
• Ignoring constraints: memory, concurrency, network/disk costs.

Interview follow-ups

• When would you choose an alternative and why?
• What production issues show up and how do you diagnose them?
• How would you test edge cases?