How do I create a Jersey FormDataContentDisposition object?

I have the following method in a service:

public interface MyService {    
    @POST
    @Path("/upload-file")
    @Consumes(MediaType.MULTIPART_FORM_DATA)
    void uploadFile(@FormDataParam("file") InputStream inputStream,
                    @FormDataParam("file") FormDataContentDisposition contentDisposition);
}

and I create an instance of this interface using WebResourceFactory:

final MyService buildProxy() {
    final ClientBuilder clientBuidler = ClientBuilder.newBuilder();
    // register components, trust manager, etc.
    final WebTarget target = clientBuilder.build().target("http://myservice.example.com");
    return WebResourceFactory.newResource(
            MyService.class, target, false, ImmutableMultivaluedMap.empty(), 
            Collections.emptyList(), new Form());
}

I want to call my method using this proxy, but I can't find a convenient way to create a FormDataContentDisposition. Is my best bet really going to be to create the header string, and then pass that into new FormDataContentDisposition(String header)? Can I relax my types somewhere to get access to a more convenient constructor? Is there a different, more convenient interface I can use in a file-upload? I'm mainly including the content-disposition in my interface so I can reject a file that is too large before I save the entire thing to disk.