final StringWriter writer = new StringWriter();
final JSONWriter jsonWriter = new JSONWriter(writer);
try {
jsonWriter.object().key("user_id").value(watcherId).endObject();
} catch (JSONException e) {
throw new RedmineInternalError("Unexpected exception", e);
}
String body = writer.toString();
setEntity(httpPost, body);
String response = getCommunicator().sendRequest(httpPost);
logger.debug(response);