@RequestPart with mixed multipart request, Spring MVC 3.2

Question

I\'m developing a RESTful service based on Spring 3.2. I\'m facing a problem with a controller handling mixed multipart HTTP request, with a Second part with XMLor JSON form

Answer 1

I have managed to solve the problem

Endpoint example:

@PostMapping("/")
public Document create(@RequestPart Document document,
                       @RequestPart(required = false) MultipartFile file) {
    log.debug("#create: document({}), file({})", delegation, file);
    //custom logic
    return document;
}

Exception:

"error_message": "Content type 'application/octet-stream' not supported"

Exception is thrown from the next method:

org.springframework.web.servlet.mvc.method.annotation.AbstractMessageConverterMethodArgumentResolver.readWithMessageConverters(HttpInputMessage,MethodParameter,Type)

Solution:

We have to create custom converter @Component, which implements HttpMessageConverter or HttpMessageConverter and knows about MediaType.APPLICATION_OCTET_STREAM. For simple workaround it's enough to extend AbstractJackson2HttpMessageConverter

@Component
public class MultipartJackson2HttpMessageConverter extends AbstractJackson2HttpMessageConverter {

/**
 * Converter for support http request with header Content-Type: multipart/form-data
 */
public MultipartJackson2HttpMessageConverter(ObjectMapper objectMapper) {
    super(objectMapper, MediaType.APPLICATION_OCTET_STREAM);
}

@Override
public boolean canWrite(Class clazz, MediaType mediaType) {
    return false;
}

@Override
public boolean canWrite(Type type, Class clazz, MediaType mediaType) {
    return false;
}

@Override
protected boolean canWrite(MediaType mediaType) {
    return false;
}
}