RESTesy client using charset for file upload

resteasy-fileupload-3.java

WebTarget target = client.target("/some-resource");
MultipartFormDataOutput formData = new MultipartFormDataOutput();
formData.addFormData("file", fileContent, MediaType.TEXT_PLAIN_TYPE.withCharset("utf-8"));
Entity<MultipartFormDataOutput> entity = Entity.entity(formData, MediaType.MULTIPART_FORM_DATA);
Response response = target.request().post(entity);