How do you configure Jackson to only include non-null fields in the JSON output?

How do you configure Jackson to only include non-null fields in the JSON output?

A) By using the @JsonInclude annotation
B) By using the @JsonIgnore annotation
C) By setting a flag in the JSON
D) By overriding the equals() method

Answer:

A) By using the @JsonInclude annotation

Explanation:

In Jackson, you can configure serialization to include only non-null fields in the JSON output by using the @JsonInclude annotation. This annotation allows you to specify that only properties with non-null values should be included in the JSON representation.

For example:


public class SomeClass {
    @JsonInclude(JsonInclude.Include.NON_NULL)
    private String name;
    private int age;
    // other fields
}

In this example, the name field will only be included in the JSON output if it is non-null. If the name is null, it will be omitted from the JSON.

Reference links:

https://www.javaguides.net/p/top-java-libraries.html

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