Java – no message body writer found for multipart body, multipart / form data

I upload XML files by calling rest URL through CXF client:

WebClient webClient = WebClient.create("some base uri")
                                .header("Authorization",createAuthorizationHeader);
webClient.encoding("UTF-8");
webClient.type(MediaType.MULTIPART_FORM_DATA);
ContentDisposition cd = new ContentDisposition("attachment;filename=abc.xml");
Attachment att = new Attachment("root",stream,cd);
Response response = webClient.post(new MultipartBody(att));

But I encountered an exception in the post call

I try to add a provider:

List providers = new ArrayList();
providers.add(new org.codehaus.jackson.jaxrs.JacksonJsonProvider());
providers.add(new org.apache.cxf.jaxrs.provider.MultipartProvider());
WebClient webClient = WebClient.create(constant.getUploadURI(),providers)
                               .header("Authorization",createAuthorizationHeader);

I still get the same exception

Solution

I tested the configuration you work here. It's the whole test file

import java.io.FileInputStream;

import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.Response;

import org.apache.cxf.jaxrs.client.WebClient;
import org.apache.cxf.jaxrs.ext.multipart.Attachment;
import org.apache.cxf.jaxrs.ext.multipart.ContentDisposition;
import org.apache.cxf.jaxrs.ext.multipart.MultipartBody;
import org.junit.Test;

public class KPUploadTest {

    @Test
    public void testUpload() {

        try (FileInputStream stream = new FileInputStream("d:\\uploadtest.txt");) {
            WebClient webClient = WebClient
                    .create("http://localhost:8080/api/kp/rest/upload");
            webClient.encoding("UTF-8");
            webClient.type(MediaType.MULTIPART_FORM_DATA);
            ContentDisposition cd = new ContentDisposition(
                    "attachment;filename=abc.xml");
            Attachment att = new Attachment("root",cd);
            Response response = webClient.post(new MultipartBody(att));
            System.out.println(response.readEntity(String.class));
        } catch (Exception ex) {
            ex.printStackTrace();
        }

    }

}

Please share its failure, server or client location? Further identify errors And the CXF jaxrs version you are using