Support multiple urls in @RequestMapping on FeingClient

I am using Feign for requesting a MicroService route, but some params of the path variable are optional, i’m trying to define, multiple values for path value to handle with optional parameters, but when I do this I get an exception described below, i think this is a great and helpful feature when interfaces have optional parameters in path.

Spring Cloud Version: org.springframework.cloud:spring-cloud-dependencies:Brixton.SR6

Exception Recived with Mutiple paths:

Caused by: java.lang.IllegalStateException: Method createDocument can only contain at most 1 value field. Found: [/fields/{fieldName}/documents/create, grids/{gridIdentifier}/fields/{fieldName}/documents/create]

Feign client method definition:

@RequestMapping(
    method = POST,
    path = { "/fields/{fieldName}/documents/create", "grids/{gridIdentifier}/fields/{fieldName}/documents/create"},
    produces = APPLICATION_JSON_UTF8_VALUE,
    consumes = APPLICATION_JSON_UTF8_VALUE
  )
  ResponseEntity<ResourceContent<Document>> createDocument(
    @PathVariable("fieldName") String fieldName,
    @PathVariable(value = "gridIdentifier", required = false) String gridIdentifier,
    @RequestBody CreateDocument createDocument
  );

[leonardovillela]

Why you discourage sharing interfaces between server and client?

[zsalab]

There could be multiple urls with gridIdentfier in them, which to choose? This is a client, not a server. You need to make two separate methods in your feign interface.

I do not get your point, I think this is a really wise idea to map and use same controller / client for multiple URLs like if a resource mapped to multiple owners (yes I know many people thinks that bad design, but nobody had a good reason). Oh and the client can chose pretty easy which URL to call, based on the provided path parameters… those has names and all have to have unique name… so call the URL where the path parameters count and the names are same then in the URL