Sending multipart data with Spring WebClient using PartEvent throws error: MultipartFile resource cannot be resolved to absolute file path

Question

Using Spring Boot 3.0.2 I'm doing this request similar to example in Spring docs

    public Mono<String> createNode(@PathVariable String id,
                                 @RequestParam MultipartFile fileData,
                                 @RequestParam String name) {

        return webClient.post()
                .uri("/nodes/{id}", id)
                .header(HttpHeaders.CONTENT_TYPE, MediaType.MULTIPART_FORM_DATA_VALUE)
                .body(Flux.concat(
                        FormPartEvent.create("name", name),
                        FilePartEvent.create("fileData", fileData.getResource())
                ), PartEvent.class)
                .retrieve()
                .bodyToMono(String.class);
    }

but i got following error:

ERROR 7704 --- [nio-8081-exec-9] o.a.c.c.C.[.[.[/].[dispatcherServlet]    : Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed: org.springframework.web.reactive.function.client.WebClientRequestException: MultipartFile resource [fileData] cannot be resolved to absolute file path] with root cause

java.io.FileNotFoundException: MultipartFile resource [fileData] cannot be resolved to absolute file path
    at org.springframework.core.io.AbstractResource.getFile(AbstractResource.java:132) ~[spring-core-6.0.4.jar:6.0.4]
    at org.springframework.http.codec.multipart.FilePartEvent.create(FilePartEvent.java:97) ~[spring-web-6.0.4.jar:6.0.4]
    at org.springframework.http.codec.multipart.FilePartEvent.create(FilePartEvent.java:84) ~[spring-web-6.0.4.jar:6.0.4]

When I send multipart data using BodyInserters.fromMultipartData everything works correctly:

webClient.post()
                .uri("/nodes/{id}", id)
                .header(HttpHeaders.CONTENT_TYPE, MediaType.MULTIPART_FORM_DATA_VALUE)
                .body(fromMultipartData("name", name).with("fileData", fileData.getResource()))
                .retrieve()
                .bodyToMono(String.class);

Shoudln't be use of PartEvent equivalent solution? What is different and why first one doesn't work?

Sending multipart data with Spring WebClient using PartEvent throws error: MultipartFile resource cannot be resolved to absolute file path

0 Answers0