private void write(JsonGenerator jg, TwitterEntry entry) throws IOException {
   jg.writeStartObject();
   // can either do "jg.writeFieldName(...) + jg.writeNumber()", or this:
   jg.writeNumberField("id", entry.getId());
   jg.writeStringField("text", entry.getText());
   jg.writeNumberField("fromUserId", entry.getFromUserId());
   jg.writeNumberField("toUserId", entry.getToUserId());
   jg.writeStringField("langugeCode", entry.getLanguageCode());
   jg.writeEndObject();
   jg.close();
 }