@RequestLine("GET /?Action=GetUser&Version=2010-05-08") GetUserResponse userResponse();
}
public static void main(String... args) {
IAM iam = Feign.builder()
.decoder(new JAXBDecoder(new JAXBContextFactory.Builder().build()))
.target(new IAMTarget(args[0], args[1]));
GetUserResponse response = iam.userResponse();
System.out.println("UserId: " + response.getUserResult().getUser().getUserId());
System.out.println("UserName: " + response.getUserResult().getUser().getUsername());