[SOLVED] Task assign to multiple leads in salesforce using rest api

Task assign to multiple leads in salesforce using rest api

I am new in Salesforce.Below code working fine,Its created task "Call LeadTest" sucessfully and assignd to only one lead/contact (WhoId). But i wanted to assign same task to multiple leads/contacts.

DefaultHttpClient HttpClient = new DefaultHttpClient();
HttpParams params = HttpClient.getParams();
Date dNow = new Date( );
SimpleDateFormat ft = new SimpleDateFormat ("MM/dd/YYYY hh:mm a");
Instant instant = Instant.now();
String dueDate=instant.toString();
JSONObject json = new JSONObject();
json.put("Subject", "Call LeadTest");
json.put("Status", "Not Started");
json.put("Priority", "Low");
json.put("OwnerId", "xxxxxxxxx");
json.put("WhoId", "xxxxxxxxx");
json.put("ActivityDate", dueDate);
json.put("Description", "this is test Task");
String baseUrl = instanceUrl + "/services/data/v49.0/sobjects/Task/";
oAuthHeader = new BasicHeader("Authorization", "OAuth " + accesstoken);
HttpPost schemaHttpGet = new HttpPost(baseUrl);
schemaHttpGet.addHeader(oAuthHeader);
schemaHttpGet.addHeader(printHeader);
StringEntity params2 = new StringEntity(json.toString());
schemaHttpGet.addHeader("content-type", "application/json");
schemaHttpGet.setEntity(params2);
HttpResponse response = HttpClient.execute(schemaHttpGet);
int iStatusCode = response.getStatusLine().getStatusCode();

So please help me to find out, how to assignd created task to multiple leads/contacts. Thank you for your answer in advance.

Solution

You must enable the Shared Activities feature. Once enabled, you will be able to assign either up to 50 Contacts or exactly one Lead to a Task.

With shared activities, users can relate up to 50 contacts (but only 1 lead) to an event or a task.

It is not possible to associate multiple Leads to a Task, or a Lead and a Contact.

You can use the TaskWhoIds field or directly manipulate the TaskRelation junction records between Task and Contact or Lead to control these assignments.