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

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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!

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;
            }
        });

Jackson Ignore Properties on Marshalling, This tutorial will show how to ignore certain fields when serializing an object to JSON using Jackson 2.x. This is very useful when the Jackson� How to ignore JSON property using Jackson annotations? In this example you will know how to play with json property names using Jackson annotation @JsonProperty. Sometimes POJOs contain properties that you do not want to write out, so you can use @JsonIgnore annotation.

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.

How to ignore JSON property using Jackson annotations?, Here is the example which reads json string value from a file, maps it to the object and converts the object back to the json string format. ? 1. 2. 3. 4. 5. Then to map ownerName, we unpack the nested owner object to a Map and extract its name property. We can instruct Jackson to unpack the nested property by using a combination of @JsonProperty and some custom logic that we add to our Product class: public class Product { //

Remove @JsonProperty from fields

3 ways to ignore null fields while converting Java object to JSON , In order to better control JSON output, you can ignore null fields, and Jackson to instruct Jackson to ignore that field while converting Java object to json if its null. You can see Jackson is a very popular and efficient Java library to map Java� @JsonIgnoreProperties is a class-level annotation that marks a property or a list of properties that Jackson will ignore. Let's go over a quick example ignoring the property id from serialization: @JsonIgnoreProperties({ "id" }) public class BeanWithIgnore { public int id; public String name; }

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

How to ignore a field of JSON object using the Jackson library in Java?, The Jackson @JsonIgnore annotation can be used to ignore a certain property or field of a Java object. The property can be ignored both when� Learn to use jackson objectmapper to populate java object from json string and write json string from java object. Jackson is used to convert java object to json, and convert json to java object. In this quick jackson tutorial, I am giving examples of converting java objects to/from json programmatically. Table of Contents 1.

Jackson JSON, @JsonIgnore can be used on fields or getters or setters to ignore individual properties. toJson(employee); System.out.println(jsonString); //convert to object ; can be used to ignore a JSON property if is not defined in the POJO: Java Collections - Only put Map key/value if the specified key does not exist� On this page we will provide Jackson @JsonProperty and @JsonAlias annotation example. @JsonProperty defines a logical property used in serialization and deserialization of JSON. When we set JSON data to Java Object, it is called JSON deserialization and when we get JSON data from Java Object, it is called JSON serialization.

In these cases, you can instruct Jackson to deserialize the object to a Map. It will contain field names as keys and their deserialized contents as values. Note that the default deserializers apply for basic field types in the Map. Jackson deserializes the date as a collection, same as the array of hobbies.

Converting JSON to/from Java Objects using JACKSON API Created on: June 27, 2015 | Last updated on: September 30, 2017 websystiqueadmin This post explains Jackson data-binding , which is a common approach when dealing with JSON using Jackson API in your Java projects.

Comments
  • When you say you can't remove the @JsonProperty where it is used. You have to either remove the JsonProperty or modify where it has been used.
  • Have you tried removing the @JsonProperty and modify it where it has been used ? What were the results ?
  • Thanks for your reply, but I have mentioned that I cannot remove that annotations.
  • Thanks for your reply, but I have mentioned that I cannot remove that annotations.