• JacksonAnnotationSerializeNulls

Jackson feature: prevent serialization of nulls, default values

As of Jackson 1.1, you can suppress serialization of properties that have either:

• Null value, or
• Default value for the bean (which may be null, or any other value after being constructed using the default constructor)

These is achieved by using one of 2 mechanisms:

• Call ObjectMapper.getSerializationConfig().setSerializationInclusion() to define global setting (value enumeration JsonSerialize.Inclusion, with values ALWAYS, NON_NULL, NON_DEFAULT).

• Annotate properties (i.e. serializable field or getter method that implies a property) with @JsonSerialize(include=VALUE), where value is as above.

So either:

  ObjectMapper mapper = new ObjectMapper();
  mapper.getSerializationConfig().setSerializationInclusion(JsonSerialize.Inclusion.NON_NULL); // no more null-valued properties

or

  @JsonSerialize(include=JsonSerialize.Inclusion.NON_DEFAULT)
  public class MyBean {
    // ... only serialize properties with values other than what they default to
  }

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