Manipulate and validate ConfigurationProperties value in Spring Boot

Question

I have a configuration property:

@ConfigurationProperties(prefix = "x.retention")
@Slf4j
@ConstructorBinding
@AllNonNullByDefault
@Validated
public class RetentionProperties {

  private String isoPeriod;

}

isoPeriod is going to be a period in iso8061 format like P1M -> 1 month duration.

I want to check if the value has a correct format on Configuration Initialisation.

Can I somehow also manipulate the value on initialisation to transform it to Duration? like this

Duration duration = Duration.parse(isoPeriod);

So that I can directly use the Duration value and not validate it later in code?

Answer 1

Just change the type to Duration, Spring Boot will convert it to the proper Duration using the StringToDurationConverter.

Don't make it more complex then that.