Snippet

Reading Typed Application Properties via Value Annotation

The @Value annotation injects configuration values from application.properties or application.yml into Spring bean fields. Spring automatically converts string property values into target primitive types like int or boolean and supports fallback default values using a colon separator.

snippet.java

java

import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;
 
@Component
public class AppConfigHolder {
 
    @Value("${app.timeout:30}")
    private int connectionTimeout;
 
    @Value("${app.feature.enabled:false}")
    private boolean isFeatureEnabled;
 
    public int getConnectionTimeout() {
        return connectionTimeout;
    }
}

spring

Breakdown

@Value("${app.timeout:30}")

Injects the property 'app.timeout' as an integer, defaulting to 30 if the key is not defined.

private int connectionTimeout;

Holds the injected primitive integer value after automatic type conversion.

@Value("${app.feature.enabled:false}")

Injects a boolean configuration flag, defaulting to false if omitted.

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Reading Typed Application Properties via Value Annotation

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