Multiple @RequestPart (MultipartFile and DTO class) throws encoding error

[wen-dell]

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Hi, below is my technology stack:

Spring Boot: 2.7.3 spring-cloud-starter-openfeign --> 3.1.4 feign-form-spring --> 3.8.0 feign-form --> 3.8.0 feign-core --> 10.12

Here is my feign interface:

@PostMapping(value = "/v1/reservas-atuariais/upload")
Long upload(@RequestPart("dto") CreateReservaAtuarialDto dto, @RequestPart("file") MultipartFile file);

As you can see, I have one DTO class and a MultipartFile at the same time. Whenever I request this endpoint it gives this error: error converting request body.

I have tried many solutions and encoder implementations but none of them work. It seems like a bug I think. Can you guys give some help?