if (null == populator) {
throw new ActivityStreamServiceException(null,
"populator passed was null");
}
ActivityStreamTransformer transformer = new ActivityStreamTransformer();
Map<String,Object> param = new HashMap<String, Object>();
param.put(transformer.DATA_POPULATOR, populator);
String jsonPayload = transformer.transform(param);
String postUrl = ActivityStreamUrls.AS_USER_GROUP_APP.format(this, user, group, application);
return postEntry(postUrl, jsonPayload);
}