What is @ConfigurationProperties and how does it differ from @Value? | Interview Question | TechyTalkWithDev

Spring Boot Interview Questions

254 Questions

What is the difference between application.properties and application.yml?

What is @ConfigurationProperties and how does it differ from @Value?

What is the precedence order of Spring Boot property sources?

How do you validate @ConfigurationProperties values?

What is the difference between @PropertySource and Spring Boot's automatic application.properties loading?

How do you externalize sensitive configuration like database passwords in Spring Boot?

What is the difference between @ConditionalOnProperty's matchIfMissing and having a default value in @Value?

How does Spring Boot support type-safe configuration for lists and nested objects?

Interview questions

Question 71 of 254

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What is @ConfigurationProperties and how does it differ from @Value?

Spring Boot Configuration & Properties

@ConfigurationProperties binds an entire group of related, hierarchically-prefixed properties onto a strongly-typed Java class (with fields matching each property name) in one step, supporting nested objects, lists, and maps, and integrating with Bean Validation. @Value injects a single property value into a single field via a SpEL expression — simple for one-off values, but unwieldy and repetitive for anything with more than a few related settings.

Intermediate5 min

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#@ConfigurationProperties#@Value

What is @ConfigurationProperties and how does it differ from @Value?

@ConfigurationProperties Supports Relaxed Binding

It automatically matches property keys across different naming conventions — `app.mail-host`, `app.mailHost`, and `APP_MAIL_HOST` (as an environment variable) all bind to the same `mailHost` field — which is what makes it painless to override config via environment variables in containerized deployments without needing an exact-case match to the Java field name.

@Value: one field, one property, no validation · @ConfigurationProperties: whole prefixed group, type-safe, validatable

@ConfigurationProperties Binding

java

@ConfigurationProperties(prefix = "app.mail")
record MailProperties(String host, int port, String username) {}

// application.yml:
// app:
//   mail:
//     host: smtp.example.com
//     port: 587