CODEWITHSUNDEEP
javajsonjackson
user711189
user711189

Reputation: 4483

Use JsonInclude annotation to ignore empty values in a extended class

Java 1.8, Jackson library 2.1.5

I need to override the behaviour of how an object is serialized in json.

What i need is to ignore the bonus property from the serialized json response in case the value is null and the employee is a Partner employee. However trying the code below does not seem to work as expected.

class Employee{
    private String bonus;
    public String getBonus(){return bonus;}
    public String setBonus(){this.bonus = bonus;}
}

class Partner extends Employee{
    @Override
    @JsonInclude(NON_NULL)
    public String getBonus(){return super.getBonus();}
}

Any help?

Upvotes: 4

Views: 1376

Answers (1)

Erik Gillespie
Erik Gillespie

Reputation: 3959

If you can get by with excluding all null properties, then you can use the @JsonSerialize on the class. The following test runs successfully for me using Jackson 2.1.5:

import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.annotation.JsonSerialize;
import org.junit.Test;

public class SomeTest {
    public static class Employee {
        private String bonus;

        public String getBonus() {
            return bonus;
        }

        public void setBonus(String bonus) {
            this.bonus = bonus;
        }
    }

    @JsonSerialize(include = JsonSerialize.Inclusion.NON_NULL)
    public static class Partner extends Employee {
        @Override
        public String getBonus() {
            return super.getBonus();
        }
    }

    @Test
    public void testSerialize() throws Exception {
        Employee employee = new Employee();
        Partner partner = new Partner();

        ObjectMapper objectMapper = new ObjectMapper();
        System.out.println("Employee: " + objectMapper.writeValueAsString(employee));
        System.out.println(" Partner: " + objectMapper.writeValueAsString(partner));
    }
}

Output:

Employee: {"bonus":null}
 Partner: {}

Upvotes: 2

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