How to exclude completely empty object form JSON response in java

Question

Below is the sample class :

import java.io.Serializable;
import com.fasterxml.jackson.annotation.JsonIgnore;
import com.fasterxml.jackson.annotation.JsonInclude;
import com.fasterxml.jackson.annotation.JsonProperty;
import com.fasterxml.jackson.annotation.JsonInclude.Include;
import lombok.Data;
import lombok.Getter;
import lombok.Setter;

@Getter
@Setter
@Data
@JsonInclude(Include.NON_NULL)
public class SpouseRes implements Serializable  {

    private static final long serialVersionUID = 7830471917333093173L;
    
    //This object is used to check if the object is empty or not (all data members are null)
    @JsonIgnore
    private static final SpouseRes EMPTY = new SpouseRes();

    @JsonInclude(Include.NON_DEFAULT)
    @JsonProperty("age")
    private Integer age;
    
    @JsonProperty("salary")
    private SalaryResponse salary;
    
    // Function to check if the current object is empty
    @JsonIgnore
    public boolean isEmpty() {
        return this.equals(EMPTY);
    }
}

When getting this object from response, this is empty and the data member is getting set to 0. Thats why its not getting detected as empty in Object.isEmpty(). Below is the setter code :

        // Setting spouse salary
        SpouseRes spouse = new SpouseRes();

        // Check if Retirement age is null or default value 0
        if(Client.getSpouseRetireAge() != 0 || Client.getSpouseRetireAge() != null) {
            spouse.setRetireAge(Client.getSpouseRetireAge());
        }
        else {
            spouse.setRetireAge(null);  
        }

The JSON output is :

  "client": {
                  "displayName": "Tony",
                  "age": 14,
                  "retirementAge": 90,
                  "salary": {
                  "amount": 0.0
                   },
                   "spouse": {}
            }

So, after using all of these, still getting this empty Object in JSON response, How to remove this ?

Mario Petrovic · Accepted Answer · 2021-09-27 12:36:01Z

1

In order to exclude and empty object in response you will have to annotate your class with:

@JsonInclude(JsonInclude.Include.NON_EMPTY)

edited Sep 27, 2021 at 12:36

Mario Petrovic

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answered Sep 27, 2021 at 10:15

Hassan Liasu

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2 Comments

Masoom Raza Over a year ago

Didn't worked bro, I think I should change the OR condition to AND to make the default value of Integer(0) to NULL explicitly. As the object is not empty, one of its data member is set to default value 0 when I use 'new' keyword. So it wouldn't be detected as empty.

Hassan Liasu Over a year ago

hmm. yea that should be a work around.

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