I'm trying to use the new reactive web-mvc implementation in a spring boot 2.0 application. I'm trying to define a method which consume multipart file but do not succeed at making it working :( - I always get a 415 error.
On one hand I have a controller containing the following request mapping :
@RequestMapping(method = RequestMethod.POST, path = "/myPath/{param}/{param2}", consumes = MediaType.MULTIPART_FORM_DATA_VALUE)
@ResponseBody
public Mono<Void> postFile(
@RequestBody MultipartFile data,
@PathVariable("param") String param,
@PathVariable("param2") String param2,
@RequestHeader(name = HEADER_DATE, required = false) @DateTimeFormat(pattern = DATE_FORMAT) Instant instant
){
return fileService.handleData(Mono.just(data), param, param2, instant);
}
On the other hand I had to add a server on the top of the basic dependencies as it seems netty do not handle multipart files. I so added the spring-boot-starter-tomcatdependency which enabled the MultipartAutoConfiguration to be matched and satisfied on application auto configuration.
When posting something using a curl call :
curl 'Meta-Date: 20170101104532' --form "file=@file.bin" http://localhost:8082/myPath/foo/bar
while debug logs are activated (logging.level.org.springframework.web=DEBUG) I got this exception :
org.springframework.web.server.UnsupportedMediaTypeStatusException: Request failure [status: 415, reason: "Content type 'multipart/form-data;boundary=------------------------58fa43b8f1a26de4' not supported"]
This error is thrown by the RequestBodyArgumentResolver which has the the following supported media types : [*/*, text/xml, application/*+json;charset=UTF-8, application/xml, text/plain;charset=UTF-8, application/x-www-form-urlencoded, application/json;charset=UTF-8] provided by 9 DecoderHttpMessageReader.
Before posting I also took a look at :
MultipartAutoConfiguration#multipartResolver matchedContent-Transfer-Encoding: binary didn't changed anything.My understanding is that Spring web 5.0 uses a new request decoder system as I don't find these classes on a spring 4 spring boot application, and there is not yet any DecoderHttpMessageReader dealing with multipart file
Did I miss something ? Or should I wait one to be implemented ?
Okay, It seems this is just not implemented for now as it currently exists a pull request for this feature : Add reactive multipart request support #1201
Should have check this earlier...
[EDIT] : The issue has been solved and merged into Spring master branch. Should no longer be an issue.
@PutMapping(value="/{..}",consumes = MediaType.MULTIPART_FORM_DATA_VALUE)
public Mono<Void> save(@RequestPart("file") FilePart multipartFormData,@RequestParam("fileName") String fileName,@PathVariable("..") String ..) throws IOException {
List<ByteBuffer> bytesList = new LinkedList<>();
multipartFormData.content().
subscribe(item->bytesList.add(item.asByteBuffer()));
int totalBytes = bytesList.stream().mapToInt(item->item.capacity()).sum();
ByteBuffer buffer = ByteBuffer.allocate(totalBytes);
bytesList.stream().forEach(byteBuff->buffer.put(byteBuff));
baseImageHandler.saveImage(buffer, fileName, baseItemId);
return Mono.empty();
}
Please note that it is a dev verison, but this is how I have managed to do it.