fix for the empty ref attribute of RequestBody annotation

[diuis]

When a jax-rs method parameter is annotated in this way, without the ref attribute:

  public AssetViewModel create(@RequestBody(
                                            name = "asset",
                                            description = "request body in json format",
                                            content = @Content(
                                                               mediaType = APPLICATION_JSON,
                                                               schema = @Schema(name = "Asset", 
                                                                                                  implementation = AssetViewModel.class)),
                                                               required = true) final AssetViewModel _asset) {

    _log.log(Level.INFO, "Creating {0}", _asset);

    return _asset;
  }

this code:
this._ref = _ref.startsWith("#") ? _ref : ("#/components/requestBodies/" + _ref); generates an invalid openapi json:

"/api/asset":{
      "post":{
        "deprecated":false,
        "description":"api to create a new Asset",
        "operationId":"create",
        "parameters":[
        ],
        "requestBody":{
          "$ref":"#/components/requestBodies/",

I think that isn't correct, and swagger-ui complains with the error:

Resolver error at paths./api/asset.post.requestBody.$ref
Could not resolve reference because of: Could not resolve pointer: /components/requestBodies/ does not exist in document

[diuis]

@rmannibucau please take a look at this pr

[rmannibucau]

Hi @diuis
Do you mind adding a test? Updated a oot of these issues earlier today and wonder if it was missed.
Also the fix shouldnt be in setref peobably but in the caller, wdyt?

[diuis]

Hi @rmannibucau , your abd695b commit fixed the RequestBody empty ref bug:

if (!requestBody.ref().isEmpty()) {
                impl.ref(requestBody.ref());
}

I will close my PR.
Thanx!