mapper.readValue not honoring JSON Views - json

Question

I'm using JSONView to hide things from being shown to the API. Everything works if I want to have non-human readable JSON. The problem is, I'm also trying to prettify the json to make it look more readable. The second-to-last line in the below method does this:
#RequestMapping(path = "/questions")
public #ResponseBody List<Question> questionListRest() throws IOException {
ObjectMapper mapper = new ObjectMapper();
String result = mapper
.writerWithView(Views.Public.class)
.writeValueAsString((List<Question>) questionRepository.findAll());
List<Question> JsonList = mapper.readValue(result, new TypeReference<List<Question>>(){});
return JsonList;
}
However, it initializes 'answer' as null, even though answer should be hidden from the json completely (and it is hidden from the json string before mapper.readValue is called):
[ {
"questionId" : 6,
"questionName" : "Which of the following would you most likely eat?",
"questionType" : "checkbox",
"values" : [ "A chainsaw", "A table", "An Apple" ],
"answers" : null
}, {
"questionId" : 7,
"questionName" : "What countries have you visited",
"questionType" : "checkbox",
"values" : [ "Finland", "Sweden", "Estonia" ],
"answers" : null
}, {
"questionId" : 8,
"questionName" : "Where did you last feel unconfortable",
"questionType" : "checkbox",
"values" : [ "At a bar", "While coding spring", "While eating an unsliced long sub" ],
"answers" : null
} ]
Here is my Question class:
#Entity
public class Question {
#JsonIgnore
private static AnswerRepository answerRepository;
#JsonIgnore
private static CategoryRepository categoryRepository;
#Id
#GeneratedValue(strategy=GenerationType.AUTO)
private Long questionId;
private String questionName;
private String questionType; //text, radio, checkbox..
private String[] values;
public Question(String questionName, String questionType, Category category, String[] values) {
super();
this.questionName = questionName;
this.questionType = questionType;
this.category = category;
this.setValues(values);
}
public Question(String questionName, String questionType, Category category) {
super();
this.questionName = questionName;
this.questionType = questionType;
this.category = category;
}
#ManyToOne(cascade = {CascadeType.MERGE})
#JoinColumn(name = "categoryid")
#JsonBackReference
private Category category;
#JsonView(Views.Internal.class)
public List<Answer> getAnswers() {
return answers;
}
public void setAnswers(List<Answer> answers) {
this.answers = answers;
}
#JsonView(Views.Internal.class)
#OneToMany(cascade = CascadeType.ALL, mappedBy = "question")
#JsonManagedReference
private List<Answer> answers;
public Question() {
super();
}
... getters and setters ...
Here is the json before readValue is called on it (as in when result is logged)
[{"questionId":6,"questionName":"Which of the following would you most likely eat?","questionType":"checkbox","values":[ "A chainsaw", "A table", "An Apple" ]},{"questionId":7,"questionName":"What countries have you visited","questionType":"checkbox","values":[ "Finland", "Sweden", "Estonia" ]},{"questionId":8,"questionName":"Where did you last feel unconfortable","questionType":"checkbox","values":[ "At a bar", "While coding spring", "While eating an unsliced long sub" ]}]

Answer 1

I "fixed" this by adding #JsonInclude(JsonInclude.Include.NON_EMPTY) to the fields in said null or empty entities. NON_EMPTY hides all values, empty or null, NON_NULL only null values. I probably asked about the wrong thing in the first place.