Let’s say I’m given the below endpoint:

GET /hello/{id}?idType={idType}

where the allowed values of idType are [“loginId”, “contactId”]

I have to consume this service using:

@HttpExchange("/hello")
public interface HelloClient {
    @GetExchange("/{id}")
    String hello(@PathVariable String id, @RequestParam IdType idType);
}

where IdType is an enum:

public enum IdType {
    LOGIN_ID("loginId"),
    CONTACT_ID("contactId");
    String idType;
    IdType(String idType) { this.idType = idType; }
}

normally one could define a Converter<IdType, String> bean I guess and spring would use that to do it’s magic and send the correct request:

GET /hello/xyz?idType=loginId

How can I do the same with HttpInterfaces?

helloClient.hello("xyz", IdType.LOGIN_ID);
expected: GET /hello/xyz?idType=loginId
actual: GET /hello/xyz?idType=LOGIN_ID

I don’t want to have this code:

helloClient.hello("xyz", IdType.LOGIN_ID.getIdType());

Is something like this possible? Converter doesn’t seem to be used.