FeignClient converts GET method to POST

Kamil W :

I don't know what I'm doing wrong, but each time feign client converts method declared as get to post type.

@FeignClient(name = "my-service", url = "http://localhost:8114", path = "service")
public interface MyServiceClient {

    @RequestMapping(method = GET, value = "/clients")
    Client getClients(@QueryMap MyPojo pojo);
}

@Getter
@Setter
public class MyPojo {

    @NotNull
    private String someValue;
    @NotNull
    private SomeEnum someEnum;
}

This setup should be resolved to this request:
GET http://localhost:8114/service/clients?someValue=foo&someEnum=bar

But each time I'm getting this result:

{
  "timestamp": 1542378765498,
  "status": 405,
  "error": "Method Not Allowed",
  "exception": "org.springframework.web.HttpRequestMethodNotSupportedException",
  "message": "Request method 'POST' not supported",
  "path": "/service/clients"
}

However it works fine when I do it in this way:

@RequestMapping(method = GET, value = "/clients?someValue=foo&someEnum=bar")
Client getClients();

I'm working on spring-cloud-starter-feign 1.2.7.RELASE version which contains, feign-core/sl4fj/hystrix/ 9.3.1 version, but I also tested it on 10.1.0 version, with this same result.

What should I do to resolve this issue?

Kamil W :

In my project I use spring-cloud-dependencies with Camden.SR7 version which contains 9.3.1 feign version, at current time the newest version is Finchley.RELEASE which contains feign 9.7 and I see it's dedicated for spring-boot 2.x.x, but my whole infrastructure (config/eureka server) runs on 1.5.x so it produces next issues. I took a look at github documentation for feign, and I discovered @Param annotation might be helpful, but when I use it in method with 3 arguments, it throws exception Method has too many Body parameters~. Finally annotation @RequestParam from spring works as workaround, but I didn't found any source of information that we can combine these annotations.

@RequestMapping(method = GET, value = "/clients")
Client getClients(@RequestParam("someValue") String someValue, @RequestParam("someEnum") String someEnum);

I didn't found spring-cloud-dependencies version which contains 9.7 feign and it's dedicated for spring-boot 1.5.xapplications.