Spring-boot Api endpoint for uploading file not working after adding 'spring-boot-starter-hateoas' dependency - spring-boot

Question

I have a simple API function to upload a file similar to:
#PostMapping(value = "/documents",
consumes = {MediaType.MULTIPART_FORM_DATA_VALUE})
public Mono<ResponseEntity<String>> uploadDocument(#RequestPart Mono<FilePart> file){
return storeDocumentService
.upload(file)
.map(fileLocation->ResponseEntity.ok(fileLocation))
}
The code works ok and uploads the file. The problem comes when I want to make the response a bit better by returning the link to the uploaded file. For this I want to use HATEOAS 'org.springframework.boot:spring-boot-starter-hateoas'. As soon as I add the dependency 'org.springframework.boot:spring-boot-starter-hateoas' to my 'build.gradle' the endpoint stops working and I get a response:
{
"timestamp": "2023-02-20T04:28:10.620+00:00",
"status": 415,
"error": "Unsupported Media Type",
"path": "/documents"
}
and also I get in the logs:
2023-02-20T05:28:10.618+01:00 WARN 2993 --- [nio-8080-exec-4] .w.s.m.s.DefaultHandlerExceptionResolver : Resolved [org.springframework.web.HttpMediaTypeNotSupportedException: Content-Type 'application/pdf' is not supported]
It is important to point out that I upload a ".pdf" file with a header "Content-Type:multipart/form-data". And most important the only change in the working code and not working code is that i just add the dependency for HATEOAS 'org.springframework.boot:spring-boot-starter-hateoas'

Answer 1

For Uploading File We can easily use the type MultiPartFile , This will handles all the types of files and we can easily retrive the fileInputStream(data) from it.
The following code may helps you!..
#PostMapping("uploadExcelData")
public ResponseEntity<?> uploadExcelData(#RequestParam MultipartFile file) throws IOException {
List<...> dataList = fileHandling.convertFileAsJson(file);
if (!dataList.isEmpty()) {
return ....
} else {
return ResponseEntity.ok("No Records found !!");
}
}
I hope the above code will helps you to handle the File in the Endpoint.