Jackson POJO Mapping ArrayList<Class> Unrecognized Field

I'm having trouble mapping a JSON response with an arraylist of custom class. The problem is it cannot recognize "userswithdistance" field in JSON response even I made it an ArrayList in JSONResponse class. Error was: ``` com.fasterxml.jackson.databind.exc.UnrecognizedPropertyException: Unrecognized field "userswithdistance" (class com.az.d.classes.models.JSONResponse), not marked as ignorable (4 known properties: "success", "usersWithDistance", "action", "error"]) ``` Here is JSON response ``` { "action": "get_users", "success": 1, "error": 0, "userswithdistance": [ { "usr_id": "4", "distance": 9896.348 }, { "usr_id": "5", "distance": 11536.063 } ] } ``` This is JSONResponse class to wrap the JSON response. ``` public class JSONResponse { private String _action; private int _success; private int _error; private ArrayList<UsersWithDistance> _userswithdistance; public String getAction() { return _action; } public int getSuccess() { return _success; } public int getError() { return _error; } public ArrayList<UsersWithDistance> getUsersWithDistance() { return _userswithdistance; } public void setAction(String value) { _action = value; } public void setSuccess(int value) { _success = value; } public void setError(int value) { _error = value; } public void setUsersWithDistance(ArrayList<UsersWithDistance> value) { _userswithdistance = value; } } ``` Here is UsersWithDistance class. ``` public class UsersWithDistance { private String _usr_id; private double _distance; public String getUsr_id() { return _usr_id; } public double getDistance() { return _distance; } public void setUsr_id(String value) { _usr_id = value; } public void setDistance(double value) { _distance = value; } } ``` The code I used in Java was: ``` JSONResponse result = mapper.readValue(URL, JSONResponse.class); ```