No serializer found for class org.json.JSONArray and no properties discovered to create BeanSerializer

Question

No serializer found for class org.json.JSONObject and no properties discovered to create BeanSerializer (to avoid exception, disable SerializationFeature.FAIL_ON_EMPTY_BEANS)

I am receiving the above error message when I'm trying to obtain a JSON array to pass into my datatable.

I followed along with this previous StackOverflow question (No serializer found for class org.json.JSONObject and no properties discovered to create BeanSerializer) to see if it would help, but I am still encountering the same issue.

@RequestMapping(value= "/loc_list", method = RequestMethod.GET)
@ResponseBody
public JSONArray getLocList(){
    List<Locations> locList = locations.findAll();
    JSONArray locArray = new JSONArray();
    for(int i = 0; i < locList.size(); i++) {
        JSONObject locObj = new JSONObject();
        locObjObj.put("id", locObjList.get(i).getId());
        locObjObj.put("name", locObjList.get(i).getName());
        locObjObj.put("coordinates", locObjList.get(i).getCoordinates());
        locObjObj.put("description", locObjList.get(i).getDescription());
        System.out.println("Target # " + i + ": " + locObjObj.toString());
        locArray.put(locObjObj);
    }
    System.out.println("JSON Array " + locArray);
    return locArray;
}

This is the output of the JSONArray (at the moment I only have one JSON Object, but would like to have multiple JSON objects in the future)

[{"name":"xxxx","coordinates":"42.3601° N, 71.0589° W","description":"city","id":3}]

I've modified my applicationContext.xml

<context:component-scan base-package="com.A21.exceptions"/>

<mvc:annotation-driven>
 <mvc:message-converters>
  <bean class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter">
          <property name="objectMapper" ref="jacksonObjectMapper" />
  </bean>
 </mvc:message-converters>
</mvc:annotation-driven>
<bean id="jacksonObjectMapper" class="com.A21.exceptions.MyJSONMapper" />

Created a new class also called MyJSONMapper.java:

package com.A21.exceptions;

import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.SerializationFeature;

public class MyJSONMapper extends ObjectMapper {
 public MyJSONMapper() {
    this.configure(SerializationFeature.FAIL_ON_EMPTY_BEANS, false);
 }
}