Java Records + Spring configuration properties

Application.java

// @EnableConfigurationProperties(AppSettings.class)
@ConfigurationPropertiesScan
public class Application {

  public static void main(String[] args) {
    SpringApplication.run(Application.class, args);
  }
}

application.yml

app:
  operation-hours:
    monday:
      start-time: '8:00'
      end-time: '17:00'
    tuesday:
      // ...

ConfigurationProperties.java

@ConfigurationProperties(prefix = "app")
public record AppSettings(
    Map<DayOfWeek, OperationHours> operationHours
) {

  public enum DayOfWeek {
    MONDAY, TUESDAY // ...
  }
  
  @ConstructorBinding
  public AppSettings {
  }

  /**
   * Required explicit constructor for records + @ConfigurationProperties.
   */
  public record OperationHours(
      LocalTime startTime,
      LocalTime endTime
  ) {

  }

  /**
   * Validate properties before startup.
   */
  @Service
  static final class OperationHoursChecker {

    OperationHoursChecker(AppSettings appSettings) {
      appSettings.operationHours().values().stream()
        .filter(oh -> oh.startTime().isAfter(oh.endTime()))
        .findAny()
        .ifPresent(oh -> throw new ApplicationContextException("Operation hour %s invalid".formatted(oh)));
    }
  }
}