ParameterizedTypeReference<CollectionModel<EntityModel<>>> returns empty content from RestTemplate / WebClient about spring-data-commons HOT 2 OPEN

I found a "kind of working thing". If I set the header of the rest template request to prs.hal-forms+json via headers.add("Accept", MediaTypes.HAL_FORMS_JSON_VALUE);, then it works so long as I don't explicitly set what the endpoint produces.

If I set produces in the GetMapping to hal+json like so: @GetMapping(produces = MediaTypes.HAL_JSON_VALUE), and update the Accept header to also accept hal+json: headers.add("Accept", MediaTypes.HAL_JSON_VALUE);, then the mapping from the response breaks and I get empty content.

from spring-data-commons.

I've updated my comment above. It still looks a bit weird to me and feels like something is broken here (probably my code :D but who knows)
Would really appreciate some help on this.

It does make sense in a way that setting Accept to hal-forms actually produces

{
  "links": [...],
  "content": [...]
}

which has exactly same structure as CollectionModel, so no wonder object mapper is able to handle it automatically

The question is there an automatic way to process CollectionModel as hal+json ? Or do I need to write my own object mapper logic?
Because the controller returns CollectionModel and produces hal+json by default unless explicitly changed via @GetMapper(produces = ...).
But consuming it via ParameterizedTypeReference<CollectionModel<EntityModel<>>> doesn't seem to work in the same way.

from spring-data-commons.