Fasterxml Jackson primitive boolean serialization

Question

I'm using Fasterxml Jackson 2.2.2

I have a simple pojo with a boolean (primitive) attribute. When the default BeanSerializer and BeanPropertyWritter try to serialize it, this attribute is skipped when its value is false.

I want:

{"id":1, "enabled":false}

What I get is:

{"id":1}

The code in BeanPropertyWritter is:

// and then see if we must suppress certain values (default, empty)
    if (_suppressableValue != null) {
        if (MARKER_FOR_EMPTY == _suppressableValue) {
            if (ser.isEmpty(value)) {
                return;
            }
        } else if (_suppressableValue.equals(value)) {
            return;
        }
    }

I've debugged it and found that BeanPropertyWritter._suppressableValue equals Boolean(false), so when a false boolean arrives to this block, it just returns and no output is returned.

What are my options? Can I configure the attribute's writter to un-set its _suppressableValue? What would be the easiest and simpler solution?

Answer 1

As was suggested, your ObjectMapper settings are probably non-default, and specify inclusion strategy of NON_DEFAULT.

But you can add @JsonInclude to override this either on your POJO class, or even for boolean property itself: make sure to use Inclusion.ALWAYS.