Domänenspezifische Wertobjekte mittels Records und Spring-Converter

public record IsoCurrencyCode(String code) {
    public IsoCurrencyCode {
        if (code == null || !code.matches("^[A-Z]{3}$")) {
            throw new IllegalArgumentException("Invalid ISO currency: " + code);
        }
    }
}
 
@Component
public class StringToIsoCurrencyConverter implements Converter<String, IsoCurrencyCode> {
    @Override
    public IsoCurrencyCode convert(String source) {
        return new IsoCurrencyCode(source.trim().toUpperCase());
    }
}