Filter method only got called once if the field is null when using `@JsonInclude(value = JsonInclude.Include.CUSTOM, valueFilter = SomeFieldFilter.class)`

Describe the bug The filter method only get called once if the field value is NULL, when using @JsonInclude(value = JsonInclude.Include.CUSTOM, valueFilter = SomeFieldFilter.class)

Version information 2.12.6.1

To Reproduce

1. create an HTTP get endpoint to return an instance of ObjectDto which has a NULL value for fieldDto:

public class ObjectDto {

    @JsonInclude(value = JsonInclude.Include.CUSTOM, valueFilter = SomeFieldFilter.class)
    private FieldDto fieldDto;

}

1. Send requests to the endpoint.
   The first time, the equals() method of SomeFieldFilter is called during the serialization. The same method never get called for the HTTP requests after.

2. For instances that have a non-NULL value for fieldDto, the equals() method of SomeFieldFilter` gets called all the time during the serialization

Expected behavior For instances that have a NULL value for fieldDto, the equals() method of SomeFieldFilter also gets called all the time during the serialization

Additional context N/A

[cowtowncoder]

Thank you. I hope to have time to check the PR in near future – thank you for contributing it and sending CLA!

[AmiDavidW]

No worries, @cowtowncoder. Thanks a lot for checking it.

I replied on the PR #3486