Adding SuppressWarnings to Spring controller generate 404 not found

Question

I'm using Spring boot to expose an API.

For the method createTransaction in TransactionController,

@RestController
@RequestMapping(value = "/Transactions")
public class TransactionController{

@PostMapping("/create")
public ResponseEntity<Transaction> createTransaction(
        @RequestParam Optional<String> name) {
    // stuff
}
}

The API works perfectly, but I have the following warning :

Warning:(29, 27) 'Optional' used as type for parameter 'name'

When I add a SuppressWarnings to avoid the compilator warning for this specefic method when I use Optional as a parameter (since I'm aware of the risk)

@SuppressWarnings("OptionalUsedAsFieldOrParameterType")

The API return 404 not found

{
"timestamp": "2020-06-05T11:32:36.053+0000",
"status": 404,
"error": "Not Found",
"message": "No message available",
"path": "/Transactions/create"
}

Any idea on what's the issue ? I want to use Optional parameter without getting warnings.