How to Ignore Null Fields When Serializing with Jackson?

Ignoring Null Fields During Jackson Serialization

When serializing data using Jackson, it can be undesirable to include null values in the output. This article explores how to configure Jackson to ignore fields with null values during serialization, providing solutions for both Jackson versions greater than 2.0 and earlier versions.

Jackson >2.0

To prevent null values from being serialized in Jackson versions greater than 2.0, you can configure the ObjectMapper directly using the setSerializationInclusion method:

mapper.setSerializationInclusion(Include.NON_NULL);

Jackson

For earlier versions of Jackson, you can use the @JsonInclude annotation to specify the inclusion rules for a specific field:

@JsonInclude(Include.NON_NULL)
class Foo
{
  String bar;
}

Getting Values Manually

Alternatively, you can use the @JsonInclude annotation on a getter method to control whether or not a field is included in the serialized output:

class Foo
{
  String bar;

  @JsonInclude(Include.NON_NULL)
  public String getBar() {
    return bar;
  }
}

This approach allows you to maintain control over the serialization behavior, ensuring that null values are only included when explicitly desired.

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