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how to use REST API to create a attachment for a task

roundmonkey

Hi,

I used following codes to upload a attachment on a task, but I always got "400: attachment name is required", I really don't know what I missed, pls help.

FileBody fb=mew FileBody(new File("d:/test.xlsx"));

HttpPost httppost = new HttpPost(url);

MultipartEntity reqEntity = new MultipartEntity();

reqEntity.addPart("name", fb);

reqEntity.addPart("name", "test.xlsx");

httppost.setEntity(reqEntity);

java.lang.Exception: createAttachmentByTaskId for task[9505] error, cause: {"errorMessage":"Attachment name is required.","statusCode":400}

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Comments

frederikherema1

Don't add the file-body as a part with name "name". Rather, use any other field-name, like:

<br>reqEntity.addPart("file", fb);<br>reqEntity.addPart("name", "test.xlsx");<br>

roundmonkey

Thank you for your quickly reply.

I tried, but it didn't work, still the same issue.

Pls kindly check my codes as followings:

File attachFile = new File("D:/test.xlsx");
respMsg = createAttachmentByTaskId(taskId, attachFile, userName, password);

FileBody fb = new FileBody(attachFile);
HttpResponse resp = JsonRequest.multipartRequest(url, fb, true, userName, password);

public static HttpResponse multipartRequest(String url, FileBody fb, boolean auth, String userName, String password)
throws Exception {
HttpResponse resp = null;
JSONObject returnResult = null;
DefaultHttpClient client = new DefaultHttpClient();
try {
HttpPost httppost = new HttpPost(url);
MultipartEntity reqEntity = new MultipartEntity();
reqEntity.addPart("file", fb);
reqEntity.addPart("name", new StringBody("test.xlsx"));
httppost.setEntity(reqEntity);
logger.info("post: " + url);
if (auth) {
   client.getCredentialsProvider().setCredentials(
     new AuthScope(AuthScope.ANY_HOST, AuthScope.ANY_PORT, AuthScope.ANY_REALM),
     new UsernamePasswordCredentials(userName, password));
   AuthCache authCache = new BasicAuthCache();
   BasicScheme basicAuth = new BasicScheme();
   String restServerAddr = PropertiesUtil.getProperty("activiti.rest.server.address");
   int restServerPort = StringUtil.getInt(PropertiesUtil.getProperty("activiti.rest.server.port"));
   authCache.put(new HttpHost(restServerAddr, restServerPort, "http"), basicAuth);
   BasicHttpContext localcontext = new BasicHttpContext();
   localcontext.setAttribute(ClientContext.AUTH_CACHE, authCache);
   httppost.addHeader(HTTP.CONTENT_TYPE, "multipart/form-data; boundary=—————————28617237579832");
   resp = client.execute(httppost, localcontext);
} else {
   resp = client.execute(httppost);
}
return resp;
} catch (Exception e) {
logger.error("multipartRequest for [" + url + "] error: " + e.getMessage(), e);
} finally {
try {
   client.getConnectionManager().shutdown();
} catch (Exception ignore) {
}
}
return resp;
}

roundmonkey

Hi frederikheremans,

It done, following is my modified codes:

HttpPost httppost = new HttpPost(url);
MultipartEntity reqEntity = new MultipartEntity(HttpMultipartMode.BROWSER_COMPATIBLE);
reqEntity.addPart("file", fb);
reqEntity.addPart("name", new StringBody("test.xlsx"));
httppost.setEntity(reqEntity);

the Key point is I must use new MultipartEntity(HttpMultipartMode.BROWSER_COMPATIBLE);

Seems the MultipartEntity reqEntity = new MultipartEntity() can not be done, that's so weird, anyway, thank you so much.

frederikherema1

Is it working now, or not?

roundmonkey

Yeah, it's working by following codes:

MultipartEntity reqEntity = new MultipartEntity(HttpMultipartMode.BROWSER_COMPATIBLE);
reqEntity.addPart("file", fb);

pkonyves

Hi,

We are trying to upload files as attachments, but using Jersey client, and did not succeed. Could you post an example HTTP POST request that works?

We tried the following with Jersey, that resulted in "Attachment name is required" error:
<code>
WebResource serviceWebResource = client.resource(baseUrl + "/runtime/tasks/" + taskId + "/attachments");
ClientResponse res = null;
FormDataMultiPart fdmp = new FormDataMultiPart();
fdmp.field("name", "An attachment");
fdmp.field("description", "An attachment description");
fdmp.field("type", "myType");
fdmp.bodyPart(new FileDataBodyPart("file", new File("/tmp/Sample.txt"), MediaType.APPLICATION_OCTET_STREAM_TYPE));
res = serviceWebResource.type(MediaType.MULTIPART_FORM_DATA).post(ClientResponse.class, fdmp);
return res.getStatus();
</code>

Then tried using <blockcode>fdmp.bodyPart( new FormDataBodyPart("name", "An attachment"));</blockcode> instead of FormDataMultiPart.field, but no success: same error. Using this method, the HTTP POST request looked like this:

<code>
Content-Type: multipart/form-data
–Boundary_9_18250141_1408968937422
Content-Type: text/plain
Content-Disposition: form-data; name="name"

An attachment
–Boundary_9_18250141_1408968937422
Content-Type: text/plain
Content-Disposition: form-data; name="description"

An attachment description
–Boundary_9_18250141_1408968937422
Content-Type: text/plain
Content-Disposition: form-data; name="type"

myType
–Boundary_9_18250141_1408968937422
Content-Type: application/octet-stream
Content-Disposition: form-data; filename="Sample.txt"; modification-date="Fri, 22 Aug 2014 19:36:17 GMT"; size=40; name="file"

SAMPLE-0123456789012345678901234567890

–Boundary_9_18250141_1408968937422–
</code>

Could you give us some hints?

pkonyves

jbarrez

I'm not familiar with Jersey, but this is how it's done in our unit test:

<code>
      Task task = taskService.newTask();
      taskService.saveTask(task);

      InputStream binaryContent = new ByteArrayInputStream("This is binary content".getBytes());

      // Add name, type and scope
      Map<String, String> additionalFields = new HashMap<String, String>();
      additionalFields.put("name", "An attachment");
      additionalFields.put("description", "An attachment description");
      additionalFields.put("type", "myType");

      // Upload a valid BPMN-file using multipart-data
      Representation uploadRepresentation = new HttpMultipartRepresentation("value",
              binaryContent, additionalFields);

      ClientResource client = getAuthenticatedClient(RestUrls.createRelativeResourceUrl(RestUrls.URL_TASK_ATTACHMENT_COLLECTION,
              task.getId()));

      Representation response = client.post(uploadRepresentation);
      assertEquals(Status.SUCCESS_CREATED, client.getResponse().getStatus());
</code>

chittaranjan168

Hi
I'm converting an image like.

byte[] blobAsBytes = image.getBytes(1, blobLength);
InputStream binaryContent = new ByteArrayInputStream(blobAsBytes);

and trying to post using spring RestTemplate

                     Map<String, Object> bodyMap2 = new HashMap<String, Object>();
       bodyMap2.put("name","Blob Name");
       bodyMap2.put("description", "blobAsBytes");
       bodyMap2.put("type", "multipart/form-data");
          bodyMap2.put("value", binaryContent);

       HttpEntity<Map<String, Object>> requestEntity3 = new HttpEntity<Map<String, Object>>(bodyMap2,header);
       responseEntity=restTemplate.exchange(passTaskIdUrl, HttpMethod.POST, requestEntity3, String.class);

result: getting exceptions like
org.springframework.http.converter.HttpMessageNotWritableException: Could not write JSON: No serializer found for class java.io.ByteArrayInputStream

Please let me know the mistake i have done here.