Custom BackendIdConverter example for LocalDate as an Entity primary key (@id) for Spring Data REST

DateIdConverter.java

public class DateIdConverter implements BackendIdConverter {
    @Override
    public Serializable fromRequestId(String id, Class<?> aClass) {
        if(supports(aClass)) {
            return id == null ? LocalDate.now() : LocalDate.parse(id);
        } else {
            return id;
        }
    }

    @Override
    public String toRequestId(Serializable id, Class<?> aClass) {
        if(supports(aClass)) {
            return ((LocalDate) id).format(DateTimeFormatter.ofPattern("yyyy-MM-dd"));
        } else {
            return id.toString();
        }
    }

    @Override
    public boolean supports(Class<?> aClass) {
        return DateId.class.isAssignableFrom(aClass);
    }
}

// An example of using this converter (maybe RepositoryRestMvcConfiguration is a wrong place for this)
// @Configuration
// public class ApplicationConfig extends RepositoryRestMvcConfiguration {
//     @Override
//     public PluginRegistry<BackendIdConverter, Class<?>> backendIdConverterRegistry() {

//         List<BackendIdConverter> converters = new ArrayList<BackendIdConverter>();
//         converters.add(new DateIdConverter());
//         converters.add(BackendIdConverter.DefaultIdConverter.INSTANCE);
//         return OrderAwarePluginRegistry.create(converters);
//     }
// }