Object's empty array fields are being ignored

[Sedivyk]

Hi,

Java 11
Springboot 2.7.1
Jackson 2.13.3

I have updated recently to Jackson 2.13.3. Since the update, my object's empty arrays are not serialized, they are omitted from the JSON. I have fixed it by adding @JsonInclude(Include.NON_NULL) to my property.

As mentioned in the documentation I would have expected my object to serialize with an empty array.
<<By default, Jackson does not ignore Null and Empty fields while writing JSON>>

I was wondering if this is intentional or a bug? If it is intentional, is there a global configuration to change the behavior since I have a few objects defined this way

The objects are serialized as part of an HTTP response

Example of API:

@GetMapping(value = "/customer/{customerId}", produces = {MediaType.APPLICATION_JSON_VALUE})
public CustomerModel getCustomer(@PathVariable("customerId") String customerId)

Example of object:

@Getter
@Setter
public class CustomerModel {
private String firstName;
private String lastName;
private List myObjectModels = new ArrayList<>();
}

serializes to:

"customerModel": {
"firstName": "String",
"lastName": "String"
}

instead of

"customerModel": {
"firstName": "String",
"lastName": "String",
"myObjectModels ": []
}

Fixed by:

@Getter
@Setter
public class CustomerModel {
private String firstName;
private String lastName;

@JsonInclude(Include.NON_NULL)
private List<MyObjectModel> myObjectModels = new ArrayList<>(); 

}

[cowtowncoder]

Since you are using a framework and not Jackson directly, these defaults are likely due to framework.
You can test this directly with Jackson: default inclusion settings are to include everything.

So defaulting to change would be within framework in question.