How to ignore @JsonProperty while converting object to map by Jackson

Question

For example, I have a class User which has only 2 fields - name and identification which annotated by @JsonProperty respectively. And I use Jackson to convert this object to a Map , but the result is not what I expected. I want to the all the keys in the result map to be what I declared in User , not the value in @JsonProperty .

Class User

class User {
    @JsonProperty("username")
    private String name;

    @JsonProperty("id")
    private int identification;

    //constructor, getters, setters and toString
}

Code snippet

ObjectMapper mapper = new ObjectMapper();
User user = new User("Bob", 123);
System.out.println(user.toString());

Map<String, Object> result = mapper.convertValue(user, Map.class);
System.out.println(result.toString());

Console output

User [name=Bob, identification=123]
{username=Bob, id=123}

But what I expected output for map is as follows. The field name should be the same defined in class User , not the value specified in @JsonProperty . BTW, I cannot remove the @JsonProperty because they are used for serialization/deserialization somewhere.

{name=Bob, identification=123}

Any advice and suggestions will be greatly appreciated. Thanks!

Answer 1

You have to configure your object mapper like this (but it will ignore all annotation)

ObjectMapper mapper = new ObjectMapper();
mapper.disable(MapperFeature.USE_ANNOTATIONS);

---

I have found another way that turns off only name setting from @JsonProperty and leave another property from @JsonProperty and another Jackson annotations. If you want to turn off some extra annotations(or part of annotation) - override method which implements it

mapper.setAnnotationIntrospector( new JacksonAnnotationIntrospector() {
            @Override
            public PropertyName findNameForSerialization(Annotated a) {
                return null;
            }
        });

Answer 2

You just simply remove the JsonProperty. Then it will automatically map to the property name.

JsonProperty annotation just help you specify the field name which is different to your property name.

Answer 3

从字段中删除@JsonProperty

Answer 4

I know several ways to achieve it:

1. Is to use @JsonSetter & @JsonGetter to manipulate serialization/deserialization names. An example:

    @JsonGetter("name") public String getName() { return name; } //# Used during deserialization @JsonSetter("username") public void setName(String name) { this.name = name; }

2. To use @JsonAlias to provide an alias for desirialization