'Uploading files Kotlin Spring Boot

So, I am trying to make and upload file(s) functionality, from some blog posts and stackoverflow questions I got this solution:

@PostMapping("/file/upload")
fun handleFileUpload(
    @RequestParam("files") files: List<MultipartFile>?,
): String {
    if(files == null) {
        return "File is null"
    }
    // SOME LOGIC
    return "All Good it seems"
}

But when I send request trough postman I my files are null, here is postman request: Postman

I saw some some solutions that use @RequestPart instead of @RequestParam, but when I go down that path, I get unsupported media type response.

PS: I use Java 11 and Spring Boot 2.6

UPDATE: Applied suggestions from comments and ended up with this code:

@PostMapping("/file/upload", consumes = [MediaType.MULTIPART_FORM_DATA_VALUE])
fun handleFileUpload(
    @RequestPart("files") files: List<MultipartFile>?,
): String {
    //SOME CODE
}

When I send request trough postman I get 415 Unsupported Media Type

javaspringspring-bootkotlinpostman


Solution 1:[1]

You should use @RequestPart List<MultipartFile> and directly specify Content-Type in Postman Postman screenshot

Solution 2:[2]

Adding to Revasha's response, you should also add

@PostMapping(consumes = MediaType.MULTIPART_FORM_DATA_VALUE)

on your endpoint to avoid the 415 http error

Sources

This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.

Source: Stack Overflow

Solution Source
Solution 1 Revasha
Solution 2 T. Aris

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