[FIXED] Java creating a JSON object results in a status 404

Issue

I am creating a JSON warning using:

String warningString = "{\"empty\":\"No YM specific lines\"}";
json = new Gson().toJson(warningString);
json = json.replaceAll("^['\"]*", "").replaceAll("['\"]*$", "").replace("\\", "");

While this works I though there would be a better way to do this and found:

import com.google.gwt.thirdparty.json.JSONObject;

JSONObject obj = new JSONObject();
try {
    obj.put("empty", "No YM specific lines");
} catch (JSONException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
}

However, this results in a status 404 when I test. I have checked the logs and can not find any errors. I am using Apache Tomcat/9.0.46.

Changed to:

import org.json.JSONException;
import org.json.JSONObject;

String json = null;
if (ymSpecificLineDetail == null) {
    //Gracefully return a warning message
        
    json = new JSONObject().put("empty", "No YM specific lines").toString();    
} else {
    json = new Gson().toJson(ymSpecificLineDetail);
}
    
response.setContentType("application/json");
response.setCharacterEncoding("UTF-8");
response.getWriter().write(json);

Solution

Change your imports to:

import org.json.JSONException;
import org.json.JSONObject;

Answered By - lkatiforis