Undefined values are not spec-compatible

[gpsfl]

Version Information:

• SF GeoJSON Java Version: 3.3.3

Expected Results:

According to the specification the following fields should be printed as an empty array inside the JSON:

• features in FeatureCollection
• coordinates in all geometries
• geometries in GeometryCollection

Observed Results:

The fields are omitted entirely inside the JSON.

This causes parse errors in other spec-compliant software such as maplibre.

Relevant Code:

    static void main() {
        System.out.println(FeatureConverter.toStringValue(new FeatureCollection()));
    }

Additional Information:

This is caused by @JsonInclude(Include.NON_EMPTY) in the GeoJsonObject class. It should probably be added on the individual fields where it's needed only.

[gpsfl]

Possible work around until this is solved:

        mapper.configOverride(FeatureCollection.class).setInclude(JsonInclude.Value.ALL_NON_NULL);
        mapper.configOverride(LineString.class).setInclude(JsonInclude.Value.ALL_NON_NULL);
        mapper.configOverride(Polygon.class).setInclude(JsonInclude.Value.ALL_NON_NULL);
        mapper.configOverride(MultiPoint.class).setInclude(JsonInclude.Value.ALL_NON_NULL);
        mapper.configOverride(MultiLineString.class).setInclude(JsonInclude.Value.ALL_NON_NULL);
        mapper.configOverride(MultiPolygon.class).setInclude(JsonInclude.Value.ALL_NON_NULL);
        mapper.configOverride(GeometryCollection.class).setInclude(JsonInclude.Value.ALL_NON_NULL);